Cementitious composition, autoclaved cement product, method for its preparation and use of a calcium aluminate cement.

Abstract

autoclaved cement compositions. The present invention relates to the use of calcium aluminate cement in autoclaved cement products, suitable cementitious compositions for forming autoclaved cement products, and a method for preparing the cementitious compositions and autoclaved cement products.

Description

1 / 51 “CEMENTITIOUS COMPOSITION, AUTOCLAVED CEMENT PRODUCT, METHOD FOR ITS PREPARATION AND USE OF CALCIUM ALUMINATE CEMENT” TECHNICAL FIELD

[001] The present invention relates to cementitious compositions comprising a calcium aluminate cement that are suitable for the preparation of autoclaved cement products, such as fiber cement boards and autoclaved aerated concrete (AAC).

[002] The present invention further relates to methods for preparing autoclaved cement products and the autoclaved cement products obtained by and / or obtainable by said methods. The present invention also relates to the use of a calcium aluminate cement and / or the cementitious compositions described herein to prepare autoclaved cement products. BACKGROUND

[003] Cementitious compositions can be autoclaved in order to harden the composition and improve certain mechanical properties.

[004] Examples of autoclaved cement products include fiber cement board and autoclaved aerated concrete (AAC). Portland cement is typically used as the cement in cementitious compositions. Lime can also be used to react with silica during autoclaving. However, both Portland cement and lime react very rapidly with water, so it is usually necessary to include a retardant in cementitious compositions. It is therefore desirable to provide suitable alternative or improved cementitious compositions for preparing autoclaved products, for example, which can provide alternative or improved autoclaved cement products and / or which can reduce the rate at which a cementitious composition reacts with water. SUMMARY Petition 870260074120, dated 07 / 24 / 2026, p. 6 / 70 2 / 51

[005] According to a first aspect of the present invention, a cementitious composition is provided comprising: from about 0.25% by weight less than about 50% by weight of a calcium aluminate cement; from about 20% by weight to about 60% by weight of one or more other hydraulic binders.

[006] In one embodiment of the first aspect of the present invention, the cementitious composition may also comprise: from about 0% by weight to about 80% by weight of one or more granular materials; and / or from about 0% by weight to about 15% by weight of one or more reinforcing fibers; and / or from about 0% by weight to about 2% by weight of one or more blowing agents; and / or from about 0% by weight to about 10% by weight of one or more tobermorite modifiers.

[007] According to a second aspect of the present invention, a method is provided for the preparation of an autoclaved cement product, the method comprising autoclaving a cementitious composition according to the first aspect of the present invention, including any embodiment thereof. In certain embodiments, the autoclaved cement product is a fiber cement board or an autoclaved aerated concrete (AAC).

[008] According to a third aspect of the present invention, an autoclaved cement product is provided that is obtained by and / or obtainable by the method of the second aspect of the present invention, including any embodiment thereof.

[009] According to a fourth aspect of the present invention, a use of a calcium aluminate cement is provided to prepare an autoclaved cement product. In certain embodiments, the Petition 870260074120, dated 07 / 24 / 2026, p. 7 / 70 3 / 51 Cementitious composition according to the first aspect of the present invention, including any embodiment thereof, is used to prepare the autoclaved cement product.

[0010] According to a fifth aspect of the present invention, a method is provided for preparing a cementitious composition according to the first aspect of the present invention.

[0011] Certain embodiments of any aspect of the present invention may provide one or more of the following advantages: • Increased resistance; • Enhanced wet and dry dimensional stability; • Increased resistance to carbonation; • Improved water intake; • good workability; • Enhanced thermal resistance; • Reduced incorporated fibers; • Low reactivity at room temperature; • Good autoclave reactivity; • Reduced environmental footprint.

[0012] The details, examples and preferences provided in relation to any one or more of the particular set forth aspects of the present invention shall also be described and applied equally to all aspects of the present invention. Any combination of the embodiments, examples and preferences described herein in all possible variations thereof is encompassed by the present invention, unless otherwise indicated herein, or otherwise clearly contradicted by the context. DETAILED DESCRIPTION

[0013] The present invention is based on the surprising discovery that using a calcium aluminate cement to prepare autoclaved cement products provides several advantages. For example, Petition 870260074120, dated 07 / 24 / 2026, p. 8 / 70 4 / 51 Calcium aluminate cement provides a product with useful reactivity at both room and autoclave temperatures. Namely, calcium aluminate cement provides a reactivity that is not so rapid that retarders need to be added to provide sufficient time to work the composition before hardening, but not so slow that the process is uneconomical. This allows the compositions used to prepare autoclaved cement products to have good workability at room temperature before being autoclaved. Furthermore, autoclaved cement products are provided with advantageous properties such as, for example, mechanical strength, toughness, wet and dry dimensional stability, carbonation resistance, and / or improved water absorption.

[0014] Calcium aluminate cement can be incorporated into a cementitious composition that is suitable for preparing an autoclaved cement product. As used herein, the term cementitious composition refers to a composition that includes one or more cements.

[0015] The cementitious composition may also comprise one or more hydraulic binders (other than calcium aluminate cement), one or more granular materials, one or more reinforcing fibers, one or more blowing agents, one or more tobermorite modifiers, or a combination thereof. The cementitious composition may, for example, comprise at least one of one or more granular materials and one or more reinforcing fibers. For example, a fiber cement board may comprise one or more reinforcing fibers. For example, an autoclaved aerated cement may comprise one or more granular materials. The cementitious composition may, for example, be a dry composition (comprising less than about 5% by weight of moisture, for example, less than about 4% by weight or less than about 3% by weight or less than about Petition 870260074120, dated 07 / 24 / 2026, page 9 / 70 5 / 51 of 2% by weight or less than about 1% by weight or less than about 0.5% by weight of moisture, for example, about 0% by weight of moisture). The moisture content is measured by heating the composition to evaporate the moisture until its mass does not change and calculating the difference in mass before and after heating. Calcium aluminate cement

[0016] Calcium aluminate cement is present in the cementitious composition in an amount of about 0.25% by weight to less than about 50% by weight based on the total dry weight of the cementitious composition. The total dry weight of the cementitious composition refers to the total weight of the materials present in the cementitious composition, excluding water. For example, calcium aluminate cement may be present in the cementitious composition in an amount equal to or greater than about 0.5% by weight or equal to or greater than about 1% by weight or equal to or greater than about 1.5% by weight or equal to or greater than about 2% by weight or equal to or greater than about 2.5% by weight or equal to or greater than about 3% by weight or equal to or greater than about 3.5% by weight or equal to or greater than about 4% by weight, based on the total dry weight of the cementitious composition.For example, calcium aluminate cement may be present in the cementitious composition in an amount equal to or less than about 45% by weight or equal to or less than about 40% by weight or equal to or less than about 35% by weight or equal to or less than about 30% by weight or equal to or less than about 25% by weight or equal to or less than about 20% by weight or equal to or less than about 15% by weight or equal to or less than about 10% by weight or equal to or less than about 9% by weight or equal to or less than about 8% by weight or equal to or less than about 7% by weight or equal to or less than about 6.5% by weight or equal to or less than. Petition 870260074120, dated 07 / 24 / 2026, p. 10 / 70 6 / 51 approximately 6% by weight or equal to or less than approximately 5.5% by weight or equal to or less than approximately 5% by weight, based on the total dry weight of the cementitious composition. For example, calcium aluminate cement may be present in the cementitious composition in an amount ranging from about 0.25% by weight to about 40% by weight, or from about 0.25% by weight to about 20% by weight, or from about 0.25% by weight to about 10% by weight, or from about 0.25% by weight to about 8% by weight, or from about 0.25% by weight to about 6% by weight, or from about 0.25% by weight to about 5% by weight, or from about 0.5% by weight to about 40% by weight, or from about 0.5% by weight to about 20% by weight, or from about 0.5% by weight to about 10% by weight, or from about 0.5% by weight to about 8% by weight. or from about 0.5% by weight to about 6% by weight or from about 0.5% by weight to about 5% by weight or from about 1% by weight to about 40% by weight or from about 1% by weight to about 20% by weight or from about 1.5% by weight to about 10% by weight or from about 1.5% by weight to about 8% by weight or from about 2% by weight to about 6% by weight or from about 2% by weight to about 5% by weight, based on the total dry weight of the cementitious composition. For example, calcium aluminate cement may be present in the cementitious composition in an amount ranging from about 0.25% by weight to about 20% by weight, or from about 0.5% by weight to about 10% by weight, or from about 1% by weight to about 8% by weight, based on the total dry weight of the cementitious composition.

[0017] The term calcium aluminate cement refers to a composition comprising CnAx where C is CaO, A is AbO3, n is an integer from 1 to 12 and x is an integer from 1 to 24.

[0018] In certain embodiments, calcium aluminate cement comprises CA2 where C is CaO and A is Al2O3. In certain embodiments, Petition 870260074120, dated 07 / 24 / 2026, page 11 / 70 7 / 51 Calcium aluminate cement comprises C2AS, wherein C is CaO, A is Al2O3, and S is SiO2. In certain embodiments, calcium aluminate cement comprises both CA2 and C2AS.

[0019] In certain embodiments, calcium aluminate cement comprises equal to or more than about 10% by weight of CA2 based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 20% by weight or equal to or more than about 30% by weight or equal to or more than about 40% by weight or equal to or more than about 45% by weight or equal to or more than about 50% by weight of CA2 based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or less than about 70% by weight, or equal to or less than about 65% by weight, or equal to or less than about 60% by weight of CA2 based on the total dry weight of the calcium aluminate cement.For example, calcium aluminate cement may comprise from about 10% by weight to about 70% by weight, or from about 20% by weight to about 70% by weight, or from about 30% by weight to about 70% by weight, or from about 40% by weight to about 70% by weight, or from about 50% by weight to about 70% by weight, or from about 50% by weight to about 60% by weight of CA2 based on the total dry weight of the calcium aluminate cement.

[0020] In certain embodiments, calcium aluminate cement comprises equal to or more than about 15% by weight of C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 20% by weight or equal to or more than about 25% by weight of C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or less than about 45% by weight or equal to Petition 870260074120, dated 07 / 24 / 2026, page 12 / 70 8 / 51 or less than about 40% by weight or equal to or less than about 35% by weight or equal to or less than about 30% by weight of C2AS based on the total dry weight of calcium aluminate cement. For example, calcium aluminate cement may comprise from about 0% by weight to about 45% by weight, or from about 5% by weight to about 45% by weight, or from about 15% by weight to about 45% by weight, or from about 20% by weight to about 35% by weight, or from about 20% by weight to about 30% by weight, or from about 20% by weight to about 25% by weight, or from about 26% by weight to about 32% by weight of C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise from about 15% by weight to about 45% by weight or from about 20% by weight to about 35% by weight of C2AS based on the total dry weight of the calcium aluminate cement.

[0021] In certain embodiments, calcium aluminate cement comprises equal to or more than about 80% by total weight of CA2 and C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 85% by weight, or equal to or more than about 90% by weight, or equal to or more than about 95% by total weight of CA2 and C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise up to 100% by total weight of CA2 and C2AS based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or less than about 99% by weight, or equal to or less than about 98% by weight, or equal to or less than about 95% by total weight of CA2 and C2AS based on the total dry weight of the calcium aluminate cement.For example, calcium aluminate cement may comprise... Petition 870260074120, dated 07 / 24 / 2026, page 13 / 70 9 / 51 approximately 80% by weight to approximately 100% by weight or approximately 80% by weight to approximately 90% by weight or approximately 85% by weight to approximately 98% by weight or approximately 90% by weight to approximately 95% by total weight of CA2 and C2AS based on the total dry weight of calcium aluminate cement.

[0022] The total amount of CnAx other than CA2 and C2AS in calcium aluminate cement may, for example, be equal to or less than about 20% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of CnAx other than CA2 and C2AS in calcium aluminate cement may be equal to or less than about 15% by weight or equal to or less than about 10% by weight or equal to or less than about 5% by weight or equal to or less than about 2% by weight or equal to or less than about 1% by weight based on the total dry weight of the calcium aluminate cement.For example, the total amount of CnAx other than CA2 and C2AS in calcium aluminate cement may be equal to or greater than about 0.5% by weight, or equal to or greater than about 1% by weight, or equal to or greater than about 2% by weight, or equal to or greater than about 5% by weight, or equal to or greater than about 10% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of CnAx other than CA2 and C2AS in calcium aluminate cement may vary from about 0.5% by weight to about 20% by weight, or from about 1% by weight to about 15% by weight, or from about 2% by weight to about 10% by weight based on the total dry weight of the calcium aluminate cement.

[0023] Calcium aluminate cement may, for example, also comprise one or more of C, CA, CA6, C3A, C4A3$, C12A7, CAS2, CS, C2S, C3S, C3S2, A3S2, C4AF, and C2A1-yFy, wherein C is CaO, A is AbO3, S is SO2, $ is SO3, F is Fe2O3, and y is 0 to 1, for example, 0 to 0.7. Petition 870260074120, dated 07 / 24 / 2026, page 14 / 70 10 / 51 For example, calcium aluminate cement may also comprise one or more of CA, CA6 and C4A3$, for example, all of CA, CA6 and C4A3$. For example, calcium aluminate cement may also comprise one or more of C, C3A, C12A7, CA, CA6 and C4A3$, for example, all of C, C3A, C12A7, CA, CA6 and C4A3$.

[0024] Calcium aluminate cement may, for example, comprise equal to or more than about 0.5% by weight of CA based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 1% by weight or equal to or more than about 1.5% by weight or equal to or more than about 2% by weight or equal to or more than about 2.5% by weight of CA based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or less than about 6% by weight or equal to or less than about 5.5% by weight or equal to or less than about 5% by weight or equal to or less than about 4.5% by weight or equal to or less than about 4% by weight or equal to or less than about 3.5% by weight of CA based on the total dry weight of the calcium aluminate cement.For example, calcium aluminate cement may comprise from about 0.5% by weight to about 6% by weight, or from about 1.5% by weight to about 4.5% by weight, or from about 2.5% by weight to about 3.5% by weight of CA based on the total dry weight of the calcium aluminate cement.

[0025] Calcium aluminate cement may, for example, comprise equal to or more than about 0.25% by weight of CA6 based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 0.5% by weight or equal to or more than about 1% by weight or equal to or more than about 2% by weight or equal to or Petition 870260074120, dated 07 / 24 / 2026, p. 15 / 70 11 / 51 more than about 5% by weight of CAe based on the total dry weight of the calcium aluminate cement. For example, the calcium aluminate cement may comprise equal to or less than about 15% by weight or equal to or less than about 10% by weight or equal to or less than about 5% by weight of CAe based on the total dry weight of the calcium aluminate cement. For example, the calcium aluminate cement may comprise from about 0.25% by weight to about 15% by weight or from about 0.5% by weight to about 10% by weight or from about 1% by weight to about 15% by weight of CAe based on the total dry weight of the calcium aluminate cement.

[0026] The total amount of CA and CAe in calcium aluminate cement may, for example, be equal to or less than about 20% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of CA and CAe in calcium aluminate cement may, for example, be equal to or less than about 15% by weight or equal to or less than about 10% by weight or equal to or less than about 5% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of CA and CAe in calcium aluminate cement may, for example, be equal to or more than about 0.5% by weight or equal to or more than about 1% by weight or equal to or more than about 2% by weight based on the total dry weight of the calcium aluminate cement.For example, the total amount of CA and CAe in calcium aluminate cement can, for example, be from 0% by weight to about 20% by weight or from about 0.5% by weight to about 15% by weight or from about 1% by weight to about 10% by weight based on the total dry weight of the calcium aluminate cement.

[0027] Calcium aluminate cement may, for example, comprise equal to or more than about 5% by weight of C4AF based on the total dry weight of the calcium aluminate cement. For example, Petition 870260074120, dated 07 / 24 / 2026, page 16 / 70 12 / 51 Calcium aluminate cement may comprise equal to or more than about 10% by weight of C4AF based on the total dry weight of the calcium aluminate cement. Calcium aluminate cement may, for example, comprise equal to or less than about 20% by weight or equal to or less than about 15% by weight of C4AF based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise from about 5% by weight to about 20% by weight or from about 10% by weight to about 15% by weight of C4AF based on the total dry weight of the calcium aluminate cement.

[0028] Calcium aluminate cement may, for example, comprise equal to or more than about 0.5% by weight of C4A3$ based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or more than about 1% by weight or equal to or more than about 2% by weight or equal to or more than about 5% by weight of C4A3$ based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate cement may comprise equal to or less than about 20% by weight or equal to or less than about 15% by weight or equal to or less than about 10% by weight of C4A3$ based on the total dry weight of the calcium aluminate cement.For example, calcium aluminate cement may comprise from about 0.5% by weight to about 20% by weight, or from about 0.5% by weight to about 15% by weight, or from about 1% by weight to about 10% by weight, or from about 0.5% by weight to about 12% by weight of C4A3, based on the total dry weight of the calcium aluminate cement.

[0029] The total amount of C12A7 and CA and C4A3$ in calcium aluminate cement may, for example, be equal to or less than about 10% by weight based on the total dry weight of the aluminate cement. Petition 870260074120, dated 07 / 24 / 2026, page 17 / 70 13 / 51 of calcium. For example, the total amount of C12A7 and CA and C4A3$ in calcium aluminate cement may, for example, be equal to or less than about 8% by weight or equal to or less than about 6% by weight or equal to or less than about 5% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of C12A7 and CA and C4A3$ in calcium aluminate cement may, for example, be equal to or more than about 0.5% by weight or equal to or more than about 1% by weight or equal to or more than about 2% by weight or equal to or more than about 3% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of C12A7 and CA and C4A3 in calcium aluminate cement can, for example, vary from about 0.5% by weight to about 10% by weight or from about 1% by weight to about 8% by weight based on the total dry weight of the calcium aluminate cement.

[0030] The total amount of C, C3A, C12A7, CA and C4A3$ in calcium aluminate cement may, for example, be equal to or less than about 10% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of C, C3A, C12A7, CA and C4A3$ in calcium aluminate cement may, for example, be equal to or less than about 8% by weight or equal to or less than about 6% by weight or equal to or less than about 5% by weight based on the total dry weight of the calcium aluminate cement. For example, the total amount of C, C3A, C12A7, CA and C4A3$ in calcium aluminate cement may, for example, be equal to or more than about 0.5% by weight or equal to or more than about 1% by weight or equal to or more than about 2% by weight or equal to or more than about 3% by weight based on the total dry weight of the calcium aluminate cement.For example, the total amount of C, C3A, C12A7, CA, and C4A3 in calcium aluminate cement can, for instance... Petition 870260074120, dated 07 / 24 / 2026, page 18 / 70 14 / 51 For example, vary from about 0.5% by weight to about 10% by weight or from about 1% by weight to about 8% by weight based on the total dry weight of the calcium aluminate cement.

[0031] Calcium aluminate cement may, for example, also comprise one or more of Fe2O3, TiO2SO3, and MgO. Calcium aluminate cement may, for example, comprise from 0% by weight to about 5% by weight of each of Fe2O3, TiO2SO3, and MgO, for example, from about 0% by weight to about 3% by weight or from about 0.5% by weight to about 2% by weight of each of Fe2O3, TiO2SO3, and MgO, based on the total dry weight of the calcium aluminate cement.

[0032] Calcium aluminate cement may, for example, also comprise one or more alkali metal oxides (R2O where R is an alkali metal, such as Na2O and K2O). Calcium aluminate cement may, for example, comprise from 0% by weight to about 2% by weight of each alkali metal oxide. For example, calcium aluminate cement may comprise from about 0.5% by weight to about 1.5% by weight or from about 0.5% by weight to about 1% by weight of each alkali metal oxide.

[0033] The Fe2O3, TiO2, SO3, MgO and alkali compounds present in calcium aluminate cement are impurities that generally come from raw materials used for the manufacture of calcium aluminate.

[0034] Calcium aluminate cement may, for example, comprise from about 40% by weight to about 70% by weight of CA2, and from about 10% by weight to about 40% by weight of C2AS based on the total dry weight of the calcium aluminate cement.

[0035] Calcium aluminate cement may, for example, comprise from about 40% by weight to about 70% by weight of CA2, from about 10% by weight to about 40% by weight of C2AS, from about Petition 870260074120, dated 07 / 24 / 2026, page 19 / 70 15 / 51 from 0.5% by weight to about 10% by weight of CA, and from about 0% by weight to about 5% by weight of C4AF, based on the total dry weight of the calcium aluminate cement.

[0036] Calcium aluminate cement may, for example, comprise from about 50% by weight to about 70% by weight of CA2, and from about 15% by weight to about 35% by weight of C2AS based on the total dry weight of the calcium aluminate cement.

[0037] Calcium aluminate cement may, for example, comprise from about 40% by weight to about 60% by weight of CA2 and from about 15% by weight to about 40% by weight of C2AS based on the total dry weight of the calcium aluminate cement.

[0038] Calcium aluminate cement may, for example, comprise from about 40% by weight to about 60% by weight of CA2, from about 15% by weight to about 40% by weight of C2AS, from about 0.5% by weight to about 10% by weight of CA, and from about 0% by weight to about 5% by weight of C4AF, based on the total dry weight of the calcium aluminate cement.

[0039] Calcium aluminate cement may, for example, comprise from about 50% by weight to about 60% by weight of CA2 and from about 25% by weight to about 35% by weight of C2AS based on the total dry weight of the calcium aluminate cement.

[0040] Calcium aluminate cement may, for example, comprise from about 50% by weight to about 60% by weight of CA2, from about 25% by weight to about 35% by weight of C2AS, from about 0.5% by weight to about 5% by weight of CA, from about 0% by weight to about 2% by weight of C4AF, based on the total dry weight of the calcium aluminate cement.

[0041] Calcium aluminate cement may, for example, comprise from about 50% by weight to about 60% by weight of CA2, from about 25% by weight to about 35% by weight of C2AS, from about Petition 870260074120, dated 07 / 24 / 2026, page 20 / 70 16 / 51 from 0.5% by weight to about 5% by weight of CA, from about 0% by weight to about 2% by weight of C4AF, and from about 5% by weight to about 20% by weight of additional crystalline phases (including, for example, from about 2% by weight to about 6% by weight of C4A3) based on the total dry weight of the calcium aluminate cement.

[0042] Calcium aluminate cement may, for example, comprise about 55% by weight of CA2, about 29% by weight of C2AS, about 3% by weight of CA, about 1% by weight of C4AF, and about 12% by weight of additional crystalline phases (including, for example, about 4% by weight of C4A3$) based on the total dry weight of the calcium aluminate cement.

[0043] Calcium aluminate cement may, for example, comprise about 61% by weight of CA2, about 22% by weight of C2AS, about 7% by total weight of CA, C12A7 and C4A3$, less than about 0.1% by weight of C3A, and less than about 0.1% by weight of C, based on the total dry weight of the calcium aluminate cement.

[0044] The amount of each crystalline phase in calcium aluminate cement can be determined by quantitative X-ray diffraction, such as the Rietveld method.

[0045] Calcium aluminate cement may, for example, comprise an amorphous phase. The amount of the amorphous phase in calcium aluminate cement may, for example, be equal to or less than about 60% by weight, for example, equal to or less than about 55% by weight or equal to or less than about 50% by weight or equal to or less than about 45% by weight or equal to or less than about 35% by weight or equal to or less than about 30% by weight or equal to or less than about 25% by weight or equal to or less than about 20% by weight or equal to or less than about 15% by weight or equal to or less than about 10% by weight or equal to or less than about 5% by weight. For example, Petition 870260074120, dated 07 / 24 / 2026, p. 21 / 70 17 / 51 The amount of the amorphous phase in calcium aluminate cement may be equal to or more than about 1% by weight or equal to or more than about 2% by weight or equal to or more than about 5% by weight, based on the total dry weight of the calcium aluminate cement. For example, calcium aluminate may comprise from about 1% by weight to about 60% by weight or from about 1% by weight to about 40% by weight or from about 1% by weight to about 20% by weight or from about 2% by weight to about 10% by weight of an amorphous phase based on the total dry weight of the calcium aluminate cement.

[0046] Calcium aluminate cement may, for example, be in powder form. As used herein, the term dust refers to a particulate material in which at least about 98% of the particles have a size in the range of about 2 pm to about 170 pm, as measured by laser diffraction analysis, for example, using a Microtrac X100 particle size analyzer.

[0047] The powder may, for example, have a specific Blaine surface area measured according to the NF-EN-196-6 standard ranging between 2200 cm² / g and 4500 cm² / g, for example, between 2900 cm² / g and 3900 cm² / g.

[0048] Calcium aluminate cement may, for example, be prepared by mixing calcium oxide and aluminum oxide and sintering the mixture. The calcium oxide and aluminum oxide may, for example, be co-ground, for example, using a ball mill or any other mill known to those skilled in the art. The co-ground material may be subsequently granulated with water (to aggregate the particles in the co-ground material). Sintering can, for example, occur at a temperature equal to or greater than about 1000°C, for example, equal to or greater than about 1400°C for a period of time ranging from about 2 hours to about 10 hours.After sintering, the calcium aluminate formed can be further ground to form a desired particle size distribution. Petition 870260074120, dated 07 / 24 / 2026, page 22 / 70 18 / 51

[0049] Calcium oxide and aluminum oxide can be obtained from any suitable source, including, for example, clays and by-products. Calcium oxide can, for example, be comprised in limestone. Calcium oxide can, for example, be substantially pure calcium oxide (i.e., calcium oxide comprising equal to or less than about 5% by weight of impurities, for example, equal to or less than about 3% by weight of impurities, equal to or less than about 2% by weight of impurities, or equal to or less than about 1% by weight of impurities). Aluminum oxide can, for example, be comprised in bauxite.Aluminum oxide may, for example, be substantially pure aluminum oxide (i.e., aluminum oxide comprising equal to or less than about 5% by weight of impurities, for example, equal to or less than about 3% by weight of impurities, equal to or less than about 2% by weight of impurities, or equal to or less than about 1% by weight of impurities). Calcium oxide may, for example, be a combination of limestone and substantially pure calcium oxide. Aluminum oxide may, for example, be a combination of bauxite and substantially pure aluminum oxide. Calcium oxide may, for example, be limestone and aluminum oxide may, for example, be substantially pure aluminum oxide. Calcium oxide may, for example, be substantially pure calcium oxide and aluminum oxide may, for example, be bauxite.The amount of a certain CnAx in the composition can, for example, be adjusted by using substantially pure calcium oxide and / or aluminum oxide compared to bauxite and / or limestone. The amount of impurities (e.g., metal oxides such as silica, iron oxide, titanium dioxide, and R2O) in the composition can, for example, be reduced by using substantially pure calcium oxide and / or aluminum oxide compared to bauxite and / or limestone. Additional Hydraulic Binder Petition 870260074120, dated 07 / 24 / 2026, page 23 / 70 19 / 51

[0050] The cementitious composition may, for example, comprise one or more additional hydraulic binders (other than calcium aluminate cement). As used herein, the term hydraulic binder refers to a material that reacts with water to prepare an adhesive composition that can harden to adhere to other materials. The term hydraulic binder also includes pozzolanic materials, which react chemically with water and calcium hydroxide at room temperature to form an adhesive composition that can fix or harden to adhere to other materials.

[0051] Other hydraulic binders used in the cementitious compositions described herein may, for example, include lime and / or calcium silicate (2CaO.SiO2).

[0052] Other hydraulic binders may, for example, be selected from Portland cement, lime (including, for example, slaked lime), fly ash, pozzolanic ash, blast furnace slag, silica flour, silica fume, metakaolin, basalt, aluminum silicate, pozzolan, or a combination thereof. For example, other hydraulic binders may be selected from Portland cement, lime, calcium silicate, or a combination thereof. For example, other hydraulic binders may be selected from Portland cement, lime, or a combination thereof.

[0053] The total amount of other hydraulic binders in the cementitious composition may, for example, vary from about 20% by weight to about 60% by weight based on the total dry weight of the cementitious composition. For example, the total amount of other hydraulic binders in the cementitious composition may vary from about 30% by weight to about 50% by weight or from about 35% by weight to about 45% by weight based on the total dry weight of the cementitious composition. The ranges specified refer to the total amount of one or more other hydraulic binders. Petition 870260074120, dated 07 / 24 / 2026, p. 24 / 70 20 / 51

[0054] The total amount of Portland cement in the cementitious composition may, for example, vary from about 0% by weight to about 45% by weight, for example, from about 20% by weight to about 45% by weight or from about 30% by weight to about 45% by weight based on the total dry weight of the cementitious composition.

[0055] The total amount of lime in the cementitious composition can, for example, vary from about 0% by weight to about 30% by weight, for example, from about 10% by weight to about 30% by weight or from about 20% by weight to about 30% by weight based on the total dry weight of the cementitious composition.

[0056] The amount of lime in the cementitious composition can vary from about 0 to about 30% by weight and the amount of Portland cement in the cementitious composition can vary from about 0 to about 45% by weight, based on the total dry weight of the cementitious composition. Granular Materials

[0057] The cementitious composition may, for example, comprise one or more granular materials. The term granular materials used herein refers to a non-binding material made of granules (particles or aggregates of particles), in which at least about 98% of the granules have a particle size smaller than about 5 mm, as measured by sieving.

[0058] Granular materials can, for example, be selected from quartz, sand, limestone, gypsum, siliceous sand, or a combination thereof. The granular material can, for example, be gypsum.

[0059] The total amount of granular materials in the cementitious composition can, for example, vary from about 0% by weight to about 80% by weight based on the total dry weight of the cementitious composition. For example, the total amount of granular materials in the cementitious composition can vary from about 0.5% by weight to about 80% by weight or from about 1% by weight to about 80% by weight or Petition 870260074120, dated 07 / 24 / 2026, page 25 / 70 21 / 51 from about 5% by weight to about 80% by weight or from about 10% by weight to about 80% by weight or from about 15% by weight to about 80% by weight or from about 20% by weight to about 70% by weight or from about 25% by weight to about 70% by weight or from about 30% by weight to about 70% by weight or from about 40% by weight to about 70% by weight or from about 50% by weight to about 70% by weight based on the total dry weight of the cementitious composition. For example, the total amount of one or more granular materials in the cementitious composition can vary from about 15% by weight to about 80% by weight, or from about 25% by weight to about 70% by weight, or from about 40% by weight to about 70% by weight, based on the total dry weight of the cementitious composition.

[0060] The total amount of siliceous sand in the cementitious composition may, for example, vary from about 25% by weight to about 70% by weight or from about 30% by weight to about 70% by weight or from about 40% by weight to about 70% by weight or from about 50% by weight to about 70% by weight based on the total dry weight of the cementitious composition. Reinforcing Fibers

[0061] The cementitious composition may, for example, comprise one or more reinforcing fibers. The term reinforcing fibers used here refers to the fiber that improves the structural integrity of a material compared to the same material without the reinforcing fibers.

[0062] Reinforcing fibers can, for example, be natural fibers, synthetic fibers, or a combination thereof. Reinforcing fibers can, for example, be selected from cellulose fibers, cellulose pulp, fiber fibers, carbon fibers, polymeric fibers, or a combination thereof. Polymeric fibers can be selected from polyvinyl acetate fibers, polyethylene fibers, polyvinyl alcohol fibers, or a combination thereof. Petition 870260074120, dated 07 / 24 / 2026, page 26 / 70 22 / 51

[0063] The total amount of reinforcing fibers in the cementitious composition may, for example, vary from about 0% by weight to about 15% by weight based on the total dry weight of the cementitious composition. For example, the total amount of reinforcing fibers in the cementitious composition may be 0% by weight. For example, the total amount of reinforcing fibers in AAC or in a cementitious composition to be used to prepare AAC may be 0% by weight. For example, the total amount of reinforcing fibers in fiber cement board or in a cementitious composition to be used to prepare fiber cement board may be at least about 0.5% by weight or at least about 1% by weight.For example, the total amount of reinforcing fibers in the cementitious composition (e.g., cementitious composition to be used to prepare fiber cement board) can vary from about 0.5% by weight to about 15% by weight, or from about 1% by weight to about 12% by weight, or from about 1% by weight to about 10% by weight, or from about 2% by weight to about 8% by weight, based on the total dry weight of the cementitious composition. Expansion agents

[0064] The cementitious composition may, for example, comprise one or more blowing agents. The term blowing agent used here refers to a pore-forming agent or a material that undergoes a chemical reaction in the composition to form air bubbles that are incorporated into the product.

[0065] The expanding agent can, for example, be aluminum powder.

[0066] The total amount of expanding agents in the cementitious composition can, for example, vary from about 0% by weight to about 2% by weight based on the total dry weight of the cementitious composition. For example, the total amount of expanding agents in the cementitious composition can be 0% by weight. For example, the amount Petition 870260074120, dated 07 / 24 / 2026, page 27 / 70 23 / 51 The total amount of expanding agents in a fiber cement board or a cementitious composition to be used to prepare a fiber cement board may be 0% by weight. For example, the total amount of expanding agents in an autoclaved aerated concrete (AAC) or a cementitious composition to be used to prepare an autoclaved aerated concrete (AACC) may be at least about 0.01% by weight or at least about 0.05% by weight or at least about 0.1% by weight. For example, the total amount of blowing agents in the cementitious composition (e.g., cementitious composition to be used to prepare an autoclaved aerated concrete (AAC)) can vary from about 0.01% by weight to about 1.5% by weight, or from about 0.01% by weight to about 1% by weight, or from about 0.02% by weight to about 0.6% by weight, or from about 0.04% by weight to about 0.5% by weight, based on the total dry weight of the cementitious composition. Tobermorita Modifier

[0067] The cementitious composition may, for example, comprise one or more tobermorite modifiers. The term tobermorite modifier refers to a compound that promotes the formation of tobermorite or modifies the chemical composition of tobermorite.

[0068] The cementitious composition may, for example, comprise from about 0% by weight to about 10% by total weight of tobermorite modifiers based on the total dry weight of the cementitious composition. For example, the cementitious composition may comprise 0% by weight tobermorite modifiers. For example, an autoclaved aerated cement (AAC) or a cementitious composition to be used to prepare an AAC may comprise 0% by weight tobermorite modifiers. For example, a fiber cement board or a cementitious composition to be used to prepare a fiber cement board may comprise at least about 0.5% by weight or at least Petition 870260074120, dated 07 / 24 / 2026, p. 28 / 70 24 / 51 approximately 1% by total weight of tobermorite modifiers. For example, the cementitious composition may comprise from about 0.5% by weight to about 10% by weight or from about 1% by weight to about 10% by weight or from about 1.5% by weight to about 8% by weight or from about 2% by weight to about 6% by total weight of tobermorite modifiers.

[0069] The cementitious composition may, for example, comprise one or more tobermorite modifiers if an aluminum source and / or a sulfate source is added to the cementitious composition. Other Optional Additives

[0070] The cementitious composition may, for example, comprise one or more other optional additives. For example, the cementitious composition may comprise one or more other optional additives that affect the pH of the composition, one or more dispersing agents, one or more antioxidants, one or more viscosity modifiers, one or more hardeners, one or more accelerators, one or more retarders, one or more surfactants, one or more crosslinking agents, one or more thickening agents, one or more anti-settling agents, one or more flocculants, and / or one or more rheological property controllers.

[0071] The total quantity of other optional additives in the cementitious composition may, for example, be equal to or less than about 20% by weight based on the total dry weight of the cementitious composition. For example, the total quantity of other optional additives may be equal to or less than about 15% by weight or equal to or less than about 12% by weight or equal to or less than about 10% by weight or equal to or less than about 8% by weight or equal to or less than about 7% by weight or equal to or less than about 6% by weight or equal to or less than about 5% by weight. For example, the total quantity of other optional additives in Petition 870260074120, dated 07 / 24 / 2026, p. 29 / 70 25 / 51 Cementitious composition may be equal to or greater than about 0.5% by weight or equal to or greater than about 1% by weight. For example, the total amount of other optional additives in the cementitious composition may be from 0% by weight to about 20% by weight or from about 0.5% by weight to about 20% by weight or from about 1% by weight to about 15% by weight or from about 2% by weight to about 10% by weight.

[0072] The total amount of one or more rheological property controllers may, for example, be equal to or less than about 5% by weight based on the total dry weight of the cementitious composition. For example, the total amount of one or more rheological property controllers may be 0% by weight. For example, the total amount of one or more rheological property controllers may be from about 0.5% by weight to about 5% by weight or from about 1% by weight to about 4% by weight based on the total dry weight of the cementitious composition. Exemplary Cementitious Compositions

[0073] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; and from about 20% by weight to about 50% by weight of one or more other hydraulic binders.

[0074] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 20% by weight to about 50% by weight of one or more other hydraulic binders; and from about 0.5% by weight to about 15% by weight of a Petition 870260074120, dated 07 / 24 / 2026, page 30 / 70 26 / 51 or more reinforcing fibers.

[0075] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 20% by weight to about 50% by weight of one or more other hydraulic binders; and from about 20% by weight to about 70% by weight of one or more granular materials.

[0076] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 20% by weight to about 40% by weight of one or more other hydraulic binders; and from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[0077] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 20% by weight to about 40% by weight of one or more other hydraulic binders; and from about 30% by weight to about 70% by weight of one or more granular materials.

[0078] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 25% by weight to about 35% by weight of a Petition 870260074120, dated 07 / 24 / 2026, page 31 / 70 27 / 51 or more other hydraulic binders; and from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[0079] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 25% by weight to about 35% by weight of one or more other hydraulic binders; and from about 50% by weight to about 70% by weight of one or more granular materials.

[0080] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; and from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[0081] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; and from about 50% by weight to about 70% by weight of one or more granular materials.

[0082] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 6% by weight of cement Petition 870260074120, dated 07 / 24 / 2026, page 32 / 70 28 / 51 of calcium aluminate; from about 25% by weight to about 35% by weight of one or more other hydraulic binders; and from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[0083] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 6% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; and from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[0084] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 6% by weight of calcium aluminate cement; from about 25% by weight to about 35% by weight of one or more other hydraulic binders; and from about 55% by weight to about 65% by weight of one or more granular materials.

[0085] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 6% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; and from about 45% by weight to about 55% by weight of one or more granular materials.

[0086] The cementitious composition may, for example, comprise, Petition 870260074120, dated 07 / 24 / 2026, page 33 / 70 29 / 51 based on the total dry weight of the cementation mix: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 25% by weight to about 35% by weight of one or more other hydraulic binders; from about 50% by weight to about 70% by weight of one or more granular materials; and from about 2% by weight to about 15% by weight of one or more reinforcing fibers.

[0087] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 10% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; from about 40% by weight to about 70% by weight of one or more granular materials; and from about 2% by weight to about 15% by weight of one or more reinforcing fibers.

[0088] The cementitious composition may, for example, comprise, based on the total dry weight of the cementing composition: from about 1% by weight to about 6% by weight of calcium aluminate cement; from about 25% by weight to about 35% by weight of one or more other hydraulic binders; from about 55% by weight to about 65% by weight of one or more granular materials; and from about 2% by weight to about 10% by weight of one or more reinforcing fibers.

[0089] The cementitious composition may, for example, comprise, Petition 870260074120, dated 07 / 24 / 2026, page 34 / 70 30 / 51 based on the total dry weight of the cementation mix: from about 1% by weight to about 6% by weight of calcium aluminate cement; from about 35% by weight to about 45% by weight of one or more other hydraulic binders; from about 45% by weight to about 55% by weight of one or more granular materials; and from about 2% by weight to about 10% by weight of one or more reinforcing fibers. Method for Preparing Cementitious Composition

[0090] The cementitious compositions described herein may be prepared by any suitable methods known to those skilled in the art. The methods may, for example, comprise measuring the desired quantities of each component and mixing the components together using any suitable mixing equipment. The components may be mixed in any order.

[0091] Cement components (calcium aluminate cement and any other hydraulic binders) may, for example, be mixed into the cementitious composition after all other components. The components may, for example, be mixed in dry form. Alternatively, some or all of the components may be in an aqueous solution or suspension. Water may be added to the mixture at any stage.

[0092] The cementitious composition may, for example, be a dry composition. Alternatively, the cementitious composition may be an aqueous suspension, for example, having a solids content equal to or less than about 40% by weight solids, for example, equal to or less than about 35% by weight solids, or equal to or less than about 30% by weight solids, for example, from about 10% by weight to 40% by weight solids. Petition 870260074120, dated 07 / 24 / 2026, p. 35 / 70 31 / 51 Autoclaved cement products and method

[0093] The cementitious compositions described herein are suitable for use in preparing an autoclaved cement product. As used herein, the term autoclaved cement product refers to a product formed when a cementitious composition has been subjected to autoclave treatment, which comprises heating at a temperature between 100°C and 372°C at a pressure greater than atmospheric pressure (greater than about 101,325 kPa). For example, the autoclaved cement product according to the invention can be made according to the Hatscheck process, for example, using a Hatscheck machine according to US2018 / 0169895, the contents of which are incorporated herein by reference.

[0094] The duration of autoclave treatment can, for example, be from about 2 hours to about 2 days.

[0095] The cementitious composition may, for example, undergo curing before being subjected to autoclave treatment. Curing may, for example, occur at a temperature ranging from about 18°C ​​to about 60°C. Curing may, for example, occur at a temperature ranging from about 18°C ​​to about 30°C. Curing may, for example, occur over a period of time ranging from about 4 hours to about 96 hours, for example, from about 8 hours to about 72 hours, for example, from about 12 hours to about 60 hours, for example, from about 12 hours to about 20 hours.

[0096] Autoclaved cement products can, for example, be a fiber cement board or an autoclaved aerated concrete (AAC).

[0097] A fiber cement board is a material formed from a combination of cement and reinforcing fibers. Fiber cement boards may also comprise other materials, such as granular materials. Petition 870260074120, dated 07 / 24 / 2026, page 36 / 70 32 / 51

[0098] Autoclaved aerated concrete is a type of precast concrete composed of cement, granular materials, and an expanding agent to produce air bubbles in the composition. Autoclaved aerated concrete may, for example, also include reinforcing fibers.

[0099] The autoclaved cement product may, for example, have a spanning modulus (MOR) equal to or less than about 15 MPa. For example, the autoclaved cement product may have an MOu equal to or less than about 14 MPa or equal to or less than about 13 MPa or equal to or less than about 12 MPa or equal to or less than about 11 MPa or equal to or less than about 10 MPa or equal to or less than about 9 MPa or equal to or less than about 8 MPa. For example, the autoclaved cement product may have an MOu equal to or greater than about 2 MPa or equal to or greater than about 3 MPa or equal to or greater than about 4 MPa or equal to or greater than about 5 MPa. For example, the autoclaved cement product may have a MOR ranging from about 2 MPa to about 15 MPa, or from about 4 MPa to about 12 MPa, or from about 5 MPa to about 10 MPa.

[00100] The autoclaved cement product may, for example, have a modulus of elasticity (MOE) equal to or less than about 8500 MPa. For example, the autoclaved cement product may have an MOE equal to or less than about 8000 MPa or equal to or less than about 7500 MPa or equal to or less than about 7000 MPa or equal to or less than about 6500 MPa or equal to or less than about 6000 MPa or equal to or less than about 5500 MPa or equal to or less than about 5000 MPa or equal to or less than about 4500 MPa or equal to or less than about 4000 MPa. For example, the autoclaved cement product may have an MOE equal to or greater than approximately 1000 MPa, or equal to or greater than approximately 1500 MPa, or equal to or greater than approximately 2000 MPa, or equal to Petition 870260074120, dated 07 / 24 / 2026, p. 37 / 70 33 / 51 or greater than about 2500 MPa. For example, autoclaved cement product may have an MOE ranging from about 1000 MPa to about 8500 MPa or from about 2000 MPa to about 6000 MPa or from about 3000 MPa to about 5000 MPa.

[00101] The autoclaved cement product may, for example, have a hardness equal to or less than about 2,000 J / m2. For example, the autoclaved cement product may have a hardness equal to or less than about 1800 J / m2 or equal to or less than about 1600 J / m2 or equal to or less than about 1500 J / m2 or equal to or less than about 1400 J / m2 or equal to or less than about 1200 J / m2. For example, the autoclaved cement product may have a hardness equal to or greater than about 500 J / m2 or equal to or greater than about 600 J / m2 or equal to or greater than about 800 J / m2. For example, the autoclaved cement product can have a hardness ranging from about 500 J / m2 to about 2000 J / m2, or from about 600 J / m2 to about 1800 J / m2, or from about 800 J / m2 to about 1600 J / m2.

[00102] The mechanical properties of autoclaved cement products can be measured according to ASTM C1185 and C1186.

[00103] The autoclaved cement product may, for example, have a density ranging from about 1.0 g / cm3 to about 1.4 g / cm3, for example, from about 1.1 g / cm3 to about 1.3 g / cm3.

[00104] The autoclaved cement product may, for example, have a water absorption capacity equal to or greater than about 20%. For example, the autoclaved cement product may have a water absorption capacity equal to or greater than about 25% or equal to or greater than about 30% or equal to or greater than about 35% or equal to or greater than about 40%. For example, the autoclaved cement product may have a water absorption capacity equal to or less than about 80% or equal to or less Petition 870260074120, dated 07 / 24 / 2026, p. 38 / 70 34 / 51 than about 70% or equal to or less than about 60% or equal to or less than about 50%. For example, autoclaved cement product may have a water absorption capacity ranging from about 20% to about 80% or from about 30% to about 60% or from about 40% to about 50%.

[00105] The water absorption capacity of autoclaved cement product can be measured by immersion in water after preliminary drying in accordance with ASTM C1186.

[00106] The autoclaved cement product may, for example, have a length change equal to or less than about 0.2%. For example, the autoclaved cement product may have a length change equal to or less than about 0.15% or equal to or less than about 0.1% or equal to or less than about 0.09% or equal to or less than about 0.08% or equal to or less than about 0.07% or equal to or less than about 0.06%. For example, the autoclaved cement product may have a length change equal to or greater than about 0.01% or equal to or greater than about 0.02%. For example, the autoclaved cement product may have a length change ranging from about 0.01% to about 0.2% or from about 0.02% to about 0.1%.

[00107] The change in length of autoclaved cement product can be measured by comparing wet and dry conditions, as per ASTM C1186.

[00108] The following numbered paragraphs define the particular embodiments of the present invention:

[00109] 1. A cementitious composition comprising, based on the total dry weight of the cementitious composition: from about 0.25% by weight to less than about 50% by weight of a calcium aluminate cement; and from about 20% by weight to about 60% by weight of a Petition 870260074120, dated 07 / 24 / 2026, page 39 / 70 35 / 51 or more other hydraulic binders.

[00110] 2. The cementitious composition of paragraph 1, also comprising from about 0% by weight to about 80% by weight of one or more granular materials based on the total dry weight of the cementitious composition.

[00111] 3. The cementitious composition of paragraph 1 or 2, also comprising from about 0% by weight to about 15% by weight of one or more reinforcing fibers.

[00112] 4. The cementitious composition of any preceding paragraph, wherein the cementitious composition also comprises one or more blowing agents, for example, from about 0% by weight to about 2% by weight of one or more blowing agents.

[00113] 5. The cementitious composition of any preceding paragraph, wherein the cementitious composition also comprises one or more tobermorite modifiers, for example, from about 0% by weight to about 10% by weight of one or more tobermorite modifiers.

[00114] 6. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 0.25% by weight to about 20% by weight of a calcium aluminate cement.

[00115] 7. The cementitious composition of paragraph 6, wherein the cementitious composition comprises from about 1% by weight to about 10% by weight of a calcium aluminate cement.

[00116] 8. The cementitious composition of any of the paragraphs to 6, wherein the cementitious composition comprises from about 0.5% by weight to about 8% by weight of a calcium aluminate cement.

[00117] 9. The cementitious composition of paragraph 8, wherein the cementitious composition comprises from about 2% by weight to about 5% by weight of a calcium aluminate cement.

[00118] 10. The cementitious composition of any preceding paragraph, in which the calcium aluminate cement comprises CA2, where C is Petition 870260074120, dated 07 / 24 / 2026, pp. 40 / 70 36 / 51 CaO and A is Al2O3.

[00119] 11. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises from about 40% by weight to about 70% by weight of CA2, based on the total dry weight of the calcium aluminate cement.

[00120] 12. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises C2AS, wherein C is CaO, A is AbO3, and S is SiO2.

[00121] 13. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises from about 0% by weight to about 45% by weight of C2AS, based on the total dry weight of the calcium aluminate cement.

[00122] 14. The cementitious composition of paragraph 13, wherein the calcium aluminate cement comprises from about 15% by weight to about 45% by weight of C2AS, based on the total dry weight of the calcium aluminate cement.

[00123] 15. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises equal to or more than about 80% by total weight of CA2 and C2AS, based on the total dry weight of the calcium aluminate cement.

[00124] 16. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement also comprises one or more of C, CA, CA6, C3A, C4A3$, C12A7, CAS2, CS, C2S, C3S, C3S2, A3S2, C4AF, and C2A1-yFy, wherein C is CaO, A is AbO3, S is SiO2, $ is SO3, F is Fe2O3, and y is 0 to 1, for example, 0 to 0.7.

[00125] 17. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises from about 0.5% by weight to about 6% by weight of CA based on the total dry weight of the calcium aluminate cement.

[00126] 18. The cementitious composition of any previous paragraph, Petition 870260074120, dated 07 / 24 / 2026, page 41 / 70 37 / 51 wherein the calcium aluminate cement comprises from about 0.25% by weight to about 15% by weight of CA6 based on the total dry weight of the calcium aluminate cement.

[00127] 19. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises from about 5% by weight to about 20% by weight of C4AF based on the total dry weight of the calcium aluminate cement.

[00128] 20. The cementitious composition of any preceding paragraph, wherein the calcium aluminate cement comprises from about 0.5% by weight to about 20% by weight of C4A3$ based on the total dry weight of the calcium aluminate cement.

[00129] 21. The cementitious composition of any preceding paragraph, in which the total amount of C12A7 and CA and C4A3$ is equal to or less than about 10% by weight based on the total dry weight of the calcium aluminate cement.

[00130] 22. The cementitious composition of any preceding paragraph, in which the total amount of C, C3A, C12A7, CA and C4A3$ is equal to or less than about 10% by weight based on the total dry weight of the calcium aluminate cement.

[00131] 23. The cementitious composition of any preceding paragraph, in which one or more other hydraulic binders are selected from Portland cement, fly ash, pozzolanic ash, blast furnace slag, silica flour, silica fume, metakaolin, lime (including, for example, slaked lime), basalt, aluminum silicate, pozzolan, or a combination thereof.

[00132] 24. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 20% by weight to about 60% by weight of one or more other hydraulic binders.

[00133] 25. The cementitious composition of any previous paragraph, Petition 870260074120, dated 07 / 24 / 2026, page 42 / 70 38 / 51 wherein the cementitious composition comprises from about 20% by weight to about 40% by weight or from about 30% by weight to about 50% by weight of one or more other hydraulic binders.

[00134] 26. The cementitious composition of any preceding paragraph, wherein the granular materials are selected from quartz, sand, limestone, gypsum, siliceous sand, or a combination thereof.

[00135] 27. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 15% by weight to about 80% by weight of one or more granular materials.

[00136] 28. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 20% by weight to about 70% by weight or from about 20% by weight to about 50% by weight or from about 40% by weight to about 60% by weight of one or more granular materials.

[00137] 29. The cementitious composition of any preceding paragraph, in which one or more reinforcing fibers are selected from cellulose fibers, cellulose pulp, glass fibers, carbon fibers, polymeric fibers and combinations thereof.

[00138] 30. The cementitious composition of paragraph 29, in which the polymeric fibers are selected from polyvinyl acetate fibers, polyethylene fibers, polyvinyl alcohol fibers, or a combination thereof.

[00139] 31. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 0% by weight to about 15% by weight of one or more reinforcing fibers, for example, from about 1% by weight to about 10% by weight of one or more reinforcing fibers.

[00140] 32. The cementitious composition of any preceding paragraph, in which one or more expanding agents is aluminum, for example, aluminum powder.

[00141] 33. The cementitious composition of any previous paragraph, Petition 870260074120, dated 07 / 24 / 2026, page 43 / 70 39 / 51 wherein the cementitious composition comprises from about 0% by weight to about 2% by weight of one or more blowing agents.

[00142] 34. The cementitious composition of any preceding paragraph, wherein the cementitious composition comprises from about 0% by weight to about 5% by weight of one or more rheological property controllers.

[00143] 35. The cementitious composition of any preceding paragraph, in which the tobermorite modifiers are selected from calcium sulfates and aluminum hydroxides.

[00144] 36. A method for preparing an autoclaved cement product, the method comprising autoclaving the cementitious composition of any preceding paragraph.

[00145] 37. The method in paragraph 36, wherein the method comprises curing the cementitious composition before autoclaving.

[00146] 38. The method of paragraph 36 or 37, wherein the method comprises mixing the cementitious composition with water before autoclaving and / or before curing.

[00147] 39. Method of any of the paragraphs 36 to 38, wherein the autoclaved cement product is a fiber cement board or an autoclaved aerated concrete (AAC).

[00148] 40. An autoclaved cement product obtained by and / or obtainable by the method of any of paragraphs 36 to 39.

[00149] 41. Use of a calcium aluminate cement to prepare an autoclaved cement product.

[00150] 42. The use of paragraph 41, where the autoclaved cement product is a fiber cement board or an autoclaved aerated concrete (AAC).

[00151] 43. The use of paragraph 41 or 42, where the use increases the hardness and / or dimensional stability and / or resistance to carbonation and / or water uptake of the autoclaved cement product. Petition 870260074120, dated 07 / 24 / 2026, page 44 / 70 40 / 51

[00152] 44. The use of any of paragraphs 41 to 43, wherein the cementitious composition of any of paragraphs 1 to 35 is used to prepare the autoclaved cement product. EXAMPLES Example 1

[00153] Various cementitious compositions, according to the present invention, were prepared and used to form cement sheets that were cured and autoclaved. A reference composition not comprising calcium aluminate cement was also used to form fiber cement boards that were cured and autoclaved. The mechanical properties, water absorption, and dimensional stability of the sheets were tested using the methods described herein.

[00154] The MOR of the sheets prepared according to the present invention decreased compared to the reference MOR.

[00155] The MOE of the sheets made according to the present invention was substantially equal to or reduced compared to the reference MOE.

[00156] The hardness of the sheets according to the present invention was substantially the same or reduced compared to the hardness of the reference.

[00157] The water absorption of the sheets made according to the present invention was substantially the same compared to the water absorption of the reference.

[00158] The % change in length of sheets made according to the present invention was reduced compared to the % change in length of the reference. Example 2 Sample preparation

[00159] List of components: Petition 870260074120, dated 07 / 24 / 2026, page 45 / 70 41 / 51 - Portland cement (OPC) is a 52.5N CEMI OPC manufactured by CCB-CEMENTIR. Chemical and mineralogy analyses from a Rietveld analysis are listed in Table 1 and Table 2, respectively. - Calcium aluminate cement (CAC) was developed and manufactured by IMERYS ALUMINATES under internal reference PP290; chemical analysis and the main analyses of the mineralogical phases are listed in Table 3 and Table 4, respectively. ARBOCEL® ZZ8 / 1 natural cellulose fiber is produced by J.RETTENMAIER & SOHNE. - Silica is Millisil E400 manufactured by SIBELCO. - Plaster is DH11 manufactured by Saint Gobain - Flocculating agent is Floset NG130 manufactured by SNF Floeger, anionic polyacrylamide (Molecular weight: 30000, iconicity 25%) - The antifoaming agent is Defoam 50 PE, manufactured by Peramin. - Water is tap water. Table 1. OPC wt% CaO 63.4 Al2O3 4.5 Fe2O3 2.3 SiO2 20.4 K2O 0.94 Na2O 0.12 SO3 3 Others 5.34 Table 2. OPC % by weight C3S 68 C2S 10 C3A 9 Petition 870260074120, dated 07 / 24 / 2026, pp. 46 / 70 42 / 51 OPC % by weight C4AF 7 Cc 3 C$+C$H2 3.5 Table 3. PP290 % by weight CaO 26.4% Al2O3 60.3% SiO2 5.5% Other 7.7% Table 4. PP290 % by weight CA2 60.5% C2AS 22.3% CA + C12A7 + C4A3 7.3% C3A < 0.1% Free C < 0.1% Other 10.0%

[00160] In particular, cementitious compositions were prepared according to the following protocol.

[00161] A specific mold was used to produce the hand sheets. A 40 x 40 x 160 (in mm) plastic mold is perforated with 40 to 45 holes of 2 mm diameter. The underside of the mold is grooved with 3 parallel rows of joining holes, in order to improve water drainage during pressing (see, Fig. 1).

[00162] A 100 µm steel wire mesh filter measuring 40 x 160 (mm x mm) is placed on top of the cavity. This filter prevents the release of any solid material during pressing and assists in the final demolding of the mold. Finally, calibrated metal molds, 15 x 40 x 160 (mm x mm x mm), are placed on top of the wet mixture before pressing. Only the peripheral mold cavities were used in the examples (see Fig. 2). Petition 870260074120, dated 07 / 24 / 2026, page 47 / 70 43 / 51

[00163] All dry mix projects are weighed separately and then mixed in a 3D TURBULA® mixer for 15 min.

[00164] The following dry mixtures were prepared: Table 5. Ref.1 Ex.1 Ex.2 Ex.3 Component % by weight % by weight % by weight % by weight PP290 0 1 2 4 OPC CEM 1 C-Perf 40 39 38 36 Arbocel ZZ81 8 8 8 8 Milisil E400 51.6 51.6 51.6 51.6 Floset NG130 0.3 0.3 0.3 0.3 Defoam 50 PE 0.1 0.1 0.1 0.1

[00165] In these examples (Table 5), all mixture designs are compared with the same ratio (OPC + CAC cements) / cellulose fiber, in order to compare the mechanical properties with the same fiber content in the dry mix.

[00166] Water is then added (1.24 part weight of water to 0.5 part weight of dry mix) directly into a standard PERRIER planetary cement mortar mixer. The total weight of the mix is ​​1.74 kg. The mix is ​​then stirred at low speed (140 rpm) for 8 minutes in 2 stages: addition of water during the first 30 seconds of mixing, stopping and scraping the bowl, final mixing for 7.5 minutes.

[00167] The wet mix is ​​then poured in one step. A first layer is filled with 0.15kg of it, so that half the depth of the mold is fused. A layer of steel wire fabric and 2 layers of calibrated metal forms are then positioned on top of the newly fused layer of wet mix. The top form is then manually pressed as it can be done to prepare the first form that penetrates the mold.

[00168] When the maximum depth is reached, the process of Petition 870260074120, dated 07 / 24 / 2026, pp. 48 / 70 44 / 51 penetration is achieved using a mechanical press. Excess water is collected in a container. The mechanical pressing is performed with a 3R RP50 SYNTRIS traction device equipped with a 10 kN mechanical sensor. Pressing is done at a constant displacement speed of 2 mm / min. The press is equipped with two metal plates measuring 245 x 245 x 20 mm.

[00169] The load-displacement curve is monitored and the loading process is stopped when the load value reaches the 6kN limit, at which point water removal becomes more difficult. The hand sheets are approximately 5 to 6 mm thick after being pressed.

[00170] Pre-curing at 50 °C, 90% RH for 5 hours was then carried out on sheets of paper packaged in sealed plastic bags to prevent evaporation, in order to develop minimum mechanical strength before autoclaving to avoid premature breakage during handling.

[00171] The sheets are then cut into 3 slices to ensure they are the correct size for placement in the container. Dimensions and weight are measured for all pieces before the next stage. Autoclaving is then carried out in specific equipment operating at 175 °C 9 bar for 8 hours. A small amount of water is added to the autoclave to prevent evaporation from the hand sheet itself, and saturated steam is generated from this excess water. The hand sheets are isolated from the water thanks to ceramic support holders.

[00172] After the autoclave period, heating was stopped and the samples were kept in the autoclave until the temperature reached room temperature (approximately 25°C). Weight and dimensions were monitored. The samples were kept in a sealed plastic bag. Mechanical tests were performed after 7 days. Mineralogical Analysis Petition 870260074120, dated 07 / 24 / 2026, pp. 49 / 70 45 / 51

[00173] Regarding the analysis, XRD was performed on mixing projects after autoclaving.

[00174] The XRD pattern was made with a Bruker D8 Advance. Program with Cu Ka radius (1.5406 A) on 50mg samples, preliminary trituration and milling with RETSCH RM 200 for 30s to 2 min.

[00175] The content of Tobermorite, Quartz, Si-katoite, and Boehmite was evaluated from the X-ray diffraction pattern using a pseudo-Voigt fitting to eliminate background noise. The amorphous content was also evaluated using a ZnO powder pattern. The surface area under the peaks was then calculated to provide information in arbitrary units. The selected peaks were the reference peaks without overlap with other phases.

[00176] The remaining CA2 and C2AS, the main components of PP290, were also evaluated using the same procedure to validate CAC consumption during autoclaving.

[00177] Table 6 illustrates the main collected information provided by XRD. Table 6. 2Θ angle Ref.1 Ex.1 Ex.2 Ex.3 Quartz 26.63° 659 786 746 827 Si-Katoite 17.4-17.6° 31 48 60 90 Boehmite 32.2 - 32.4° 25 66 97 183 Tobermorite 7.6-7.8° 252 302 447 451 ca2 25.4 - 25.6° n,d, n,d, n,d, n,d, c2as 31.3-31.4° n,d, n,d, 26 49 Amorphous 32.5 27.4 27.2 27.2 Weight dosage PP290 0% 1% 2% 4% and undetectable

[00178] It can be noted that there is a linear increase in the boehmite and Si-katoite with 0 increase in CAC dosage. The percentage by weight Petition 870260074120, dated 07 / 24 / 2026, pp. 50 / 70 46 / 51 of Tobermorite also increases with the addition of PP290. As for the amorphous content (including remaining CSH after autoclaving), the percentage is reduced as soon as the PP290 design is added to the mixture. Quartz is consumed less versus reference, but it should be remembered that less calcium silicates are present (OPC / quartz ratio) when the CAC dosage is increased. Less quartz is then needed for the transformation of CSH into tobermorite.

[00179] No residual CA2 was detected in the XRD pattern and residual C2AS was observed for a higher PP290 dosage.

[00180] Furthermore, a slight broadening of the Al-tobermorite peak was observed at low additions of PP290, which could be in favor of an Al-tobermorite synthesis, as expressed by the peak standard deviation (see Table 7). Table 7. Ref.1 Ex.1 Ex.2 0.151 0.153 0.167

[00181] The Si content in Si katoite was evaluated using PASSAGLIA data from several Si-substituted katoites in the C3AS3XH6 (1-x) series ("Katoite, a new member of the C3AS3-C3AH6 series and a new nomenclature for the hydrogrossular group of minerals, PASSAGLIA E., Bull.Mineral., 107, pp605-608 (1984)"). The calculated value is in the range x = 18-22%.

[00182] It is demonstrated that CAC and also its CA2 phase are reacting in autoclaving. Mechanical Properties

[00183] Mechanical tests consist of monitoring 3 bending points of different samples of various ages, some of them until total breakage.

[00184] For bending properties, the loading rate is maintained at a speed to achieve a rate of 2 mm / min. Petition 870260074120, dated 07 / 24 / 2026, pp. 51 / 70 47 / 51

[00185] The information is extracted from the stress-strain curves. Bending Properties

[00186] The bending mechanical properties are modified with the addition of PP290. The results are shown in Figure 3. Example 3 provides greater ductility with greater displacement capacity without rupture, while still maintaining significant mechanical strength.

[00187] Pseudo-ductility can be evaluated by calculating the area under the load-displacement curve. The gain is important, for example, 3 with the highest PP290 content, providing a 15% gain as an average of 2 different tests. Change in size and water absorption

[00188] All mixture densities were measured immediately after autoclaving. Samples were immediately kept under 50% RH curing conditions at 23°C until weight stabilization. Water loss is quite rapid within 4 days. The weight loss of the samples is shown in Fig. 4.

[00189] Other samples were immediately kept under 90% RH 20°C curing conditions for up to 10–11 days without any contact with water. The reference mixture experienced weight gain (2.4%) while the higher dosage of PP290 (Example 3) experienced a slight weight loss. The potential weight gain may be due to additional hydration of the remaining OPC or the onset of carbonation.

[00190] After wet curing at 90% RH 20 °C, the samples were kept under curing conditions at 50% RH 23 °C until weight stabilization. The % weight loss of the samples is shown in Fig. 5.

[00191] Finally, the samples immediately dried at 50% RH, 23 °C were exposed for 12 days at 90% RH without contact and then 3 days underwater, to simulate extreme dry-wet-submerged conditions. Petition 870260074120, dated 07 / 24 / 2026, pp. 52 / 70 48 / 51

[00192] No significant impact was observed in all mixture designs with a similar level of water absorption in the sample weight ratio comparisons. Table 8. Ref.1 Ex.1 Ex.2 Ex.3 Wet over dry 1.08 1.09 1.05 1.04 Saturated over dry 1.39 1.41 1.41 1.38

[00193] The kinetics of water absorption with this test is very fast, as more than 95% of the water is absorbed during the first hour of curing.

[00194] Size dimensions were monitored for the same samples under different curing conditions. For successive curing conditions (10 to 11 days dry at 50% RH, then 12 days wet at 90% RH, and finally 3 days underwater), the reference mixture without PP290 showed the greatest size variation. All examples showed less size variation, and example 3 with the highest PP290 content showed significantly low variations. Table 9. Ref.1 Ex.1 Ex.2 Ex.3 Dry to wet conditions pm / m 223 200 200 8 Dry to wet conditions pm / m 546 476 574 133

[00195] For successive curing (10 to 11 days humid at 90% RH, then 21 days dry at 50% RH), Ex. 3 still demonstrates the advantage of a very small size variation versus Ref. 1. Table 10. Ref.1 Ex.1 Ex.2 Ex.3 Conditions of pm / m - 321 - 323 - 323 - 124 wet to dry Example 3 Petition 870260074120, dated 07 / 24 / 2026, pp. 53 / 70 49 / 51

[00196] Gypsum is frequently used as an alternative to co-addition to alumina trihydrate in order to catalyze the production of tobermorite. In this new example, the following gypsum compositions are made according to the same protocol as in Example 2, and we measure the properties of fiber cement boards.

[00197] The following dry mixture was prepared: Table 11. Ref.2 Ex.4 Ex.5 Ex.6 Component % by weight % by weight % by weight % by weight PP290 0 1 2 4 OPC CEM I 36 35 34 29 Plaster 4 4 4 7 Arbocel ZZ81 8 8 8 8 Millisil E400 51.6 51.6 51.6 51.6 Floset NG130 0.3 0.3 0.3 0.3 Defoam 50 PE 0.1 0.1 0.1 0.1

[00198] In the examples, all mixture designs are compared with the same ratio (OPC cements + CAC + gypsum) / cellulose fiber, in order to compare the mechanical properties with the same fiber content in the dry mix. As a consequence, less calcium silicate is introduced in the CAC dosage. The gypsum / cellulose fiber ratio was also constant in all mixture preparations, except in Ex.6 with a higher dosage of PP290. Mineralogical Analysis

[00199] The impact of gypsum is confirmed in tobermorite, but surprisingly at a higher level than expected with the reduction of OPC in the mixture design. It was noted that gypsum is converted after autoclaving into anhydrite and basanite which could react back into gypsum if in contact with water. Petition 870260074120, dated 07 / 24 / 2026, pp. 54 / 70 50 / 51 Table 12. 2Θ angle Ref.1 Ref.2 Ex.6 Quartz 26.63° 659 861 674 Si-Katoite 17.4-17.6° 31 32 97 Boehmite 32.2 - 32.4° 25 17 108 Tobermorite 7.6-7.8° 252 293 313 Anhydrite 25.4-25.6° nd 24 118 Bassanite 14.7-14.9° nd 31 nd Amorphous 32.5 27.9 17.54 and undetectable Mechanical Properties Change in Dimension and Water Intake

[00200] The same preparation and curing procedures were applied to the samples as in example 2. For samples immediately kept at 50% RH 23°C, water loss is as rapid as with the system without gypsum in 4 to 5 days (See Fig. 6).

[00201] At low PP290 dosages, water uptake is reduced between extreme flood conditions between the fully saturated or fully dry state (see Table 13). Table 13. Ref.2 Ex.4 Ex.5 Ex.6 Saturated over dry 1.47 1.37 1.44 1.56

[00202] Regarding the change in length, comparisons were made between the 2 extreme conditions of 3 days underwater at 20°C and 5 days in 50% RH at 23°C. PP290 allows for better control of expansion compared to Ref. 2, likely due to the post-hydration of calcium sulfate underwater. A higher dosage of gypsum, as in Ex. 6, will provide greater expansion. Petition 870260074120, dated 07 / 24 / 2026, pages 55 / 70 51 / 51 Table 14. Ref.2 Ex.4 Ex.5 Ex.6 Dry to underwater conditions pm / m 1 121 319 508 1 378 Bending properties

[00203] The bending mechanical properties are modified with the addition of PP290. The results are shown in Figure 7. Example 6 provides greater ductility with greater displacement capacity without rupture, while still maintaining significant mechanical strength.

[00204] Pseudo-ductility can be assessed by calculating the area under the load-displacement curve. The gain is important, for example, 6 with the highest PP290 content, providing a gain greater than 10% on average from 2 different tests.

[00205] The foregoing broadly describes certain embodiments of the present invention, without limitation. Variations and modifications, as will be readily apparent to those skilled in the art, are intended to fall within the scope of the present invention, as defined in and by the appended claims. Petition 870260074120, dated 07 / 24 / 2026, pages 56 / 70

Claims

1 / 3 CLAIMS 1. Cementitious composition, characterized in that it comprises, based on the total dry weight of the cementitious composition: from 0.25% by weight to 10% by weight of a calcium aluminate cement; and from 20% by weight to 60% by weight of one or more other hydraulic binders, wherein the calcium aluminate cement comprises CA2, wherein C is CaO and A is AbOs, for example, wherein the calcium aluminate cement comprises from 40% by weight to 70% by weight of CA2 based on the total dry weight of the calcium aluminate cement.

2. Cementitious composition according to claim 1, characterized in that the cementitious composition also comprises: from 0% by weight to 70% by weight, for example, from 15% by weight to 70% by weight, of one or more granular materials; and / or from 0% by weight to 15% by weight, for example, from 0.5% by weight to 10% by weight, of one or more reinforcing fibers; and / or from 0% by weight to 2% by weight, for example, from 0.01% by weight to 2% by weight, of one or more blowing agents; and / or from 0% by weight to 10% by weight, for example, from 0.5% by weight to 8% by weight, of one or more tobermorite modifiers.

3. Cementitious composition according to claim 1 or 2, characterized in that the calcium aluminate cement comprises C2AS, wherein C is CaO, A is AbOs, and S is SiO2, for example, wherein the calcium aluminate cement comprises from 15% by weight to 45% by weight of C2AS, based on the total dry weight of the calcium aluminate cement.

4. Cementitious composition according to any of the preceding claims, characterized in that the calcium aluminate cement comprises equal to or more than 80% by total weight of CA2 and C2AS, based on the total dry weight of the calcium aluminate cement.

5. Cementitious composition according to any of the preceding claims, characterized in that the calcium aluminate cement also comprises one or more of C, CA, CA6, C3A, C4A3$, C12A7, CAS2, CS, C2S, C3S, C3S2, A3S2, C4AF, and C2A1-yFy, wherein C is CaO, A is Al2O3, S is SiO2, $ is SO3, F is Fe2O3, and y is 0 to 1, for example, 0 to 0.

7.

6. Cementitious composition according to any of the preceding claims, characterized in that one or more other hydraulic binders are selected from Portland cement, fly ash, pozzolanic ash, blast furnace slag, silica flour, silica fume, metakaolin, lime (including, for example, slaked lime), basalt, aluminum silicate, pozzolan, or a combination thereof.

7. Cementitious composition according to any one of claims 2 to 6, characterized in that the granular materials are selected from quartz, sand, limestone, gypsum, siliceous sand, or a combination thereof.

8. Cementitious composition according to any one of claims 2 to 7, characterized in that one or more reinforcing fibers are selected from cellulose fibers, cellulose pulp, glass fibers, carbon fibers, polymeric fibers and combinations thereof.

9. Cementitious composition according to any one of claims 2 to 8, characterized in that one or more blowing agents is aluminum, for example, aluminum powder.

10. Method for preparing an autoclaved cement product, for example, a fiber cement board or an autoclaved aerated concrete (AAC), characterized in that it comprises autoclaving the cementitious composition as defined in any of the preceding claims.

11. Method according to claim 10, characterized in that the method comprises curing the cementitious composition before autoclaving and / or in that the method comprises mixing the cementitious composition with water before autoclaving and / or before curing.

12. Autoclaved cement product, for example, a fiber cement board or an autoclaved aerated concrete (AAC), characterized in that it is obtained by the method as defined in claim 10 or 11.

13. Use of a calcium aluminate cement, characterized by the fact that it is for preparing an autoclaved cement product, for example, a fiber cement board or an autoclaved aerated concrete (AAC).

14. Use according to claim 13, characterized in that the cementitious composition as defined in any one of claims 1 to 9 is used to prepare the autoclaved cement product. Petition 870260074120, dated 07 / 24 / 2026, pp. 59 / 70

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