Hydraulic compositions for ultra-high performance concrete and ultra-high performance grout

Abstract

The present invention relates to a hydraulic composition useful as ultra-high-performance concrete and ultra-high-performance grout, comprising: a) 100 parts by mass of Portland cement; b) 20 to 60 parts by mass, preferably 45 to 55 parts by mass, of at least one type of pozzolann; c) 30 to 120 parts by mass, preferably 50 to 85 parts by mass, of at least one type of aggregate having an average particle size D50 of 63 μm to 8 mm, preferably 200 μm to 3 mm; d) 0.01 to 10 parts by mass of cement dispersant; and e) 30 parts by mass or less, preferably 15 to 25 parts by mass, of water.

Description

[Technical Field]

[0001] This invention relates to a hydraulic composition useful as ultra-high-performance concrete and ultra-high-performance grout. [Background technology]

[0002] Cement-based materials are generally used in concrete or grout and typically contain aggregates and additives. For use, cement-based compositions are mixed with water, resulting in a reaction between cement and water, commonly called hydration. After hydration, the cement hardens, forming a solid building material.

[0003] In recent years, special types of concrete, such as high-performance concrete (HPC), ultra-high-performance concrete (UHPC), and high-performance and ultra-high-performance grout (UHPG), have been introduced to the market.

[0004] These special concretes and mortars typically contain high proportions of mineral binders and fine-grained aggregates. A higher proportion of fine particles results in better material uniformity, while a higher proportion of mineral binders increases strength. High-strength concretes and grouts also contain little to no water, as water not required for cement hydration evaporates, leaving behind pores that reduce strength.

[0005] In particular, blending UHPC and UHPG is difficult when it is necessary to balance workability requirements with specific strength and durability requirements.

[0006] International Publication No. 2015 / 193419 (Lafarge) discloses ultra-high-performance concrete mixes that are high-strength and non-self-leveling. Such mixes are reported to be suitable for application on inclined or vertical surfaces, for example. The mixes in International Publication No. 2015 / 193419 use a larger amount of water than is typically used in UHPC and UHPG. However, a larger amount of water frequently leads to other problems, such as high shrinkage. High shrinkage can lead to cracking, voiding, or delamination, thereby compromising durability.

[0007] There is still a need for UHPC and UHPG formulations with optimized workability, strength, and durability. This invention addresses this need. [Overview of the Initiative] [Means for solving the problem]

[0008] The object of the present invention is to provide a hydraulic composition that exhibits ultra-high strength upon hardening. The hydraulic composition of the present invention further possesses good workability and low shrinkage. The hydraulic composition of the present invention is useful as ultra-high-performance concrete and ultra-high-performance grout.

[0009] Strength in the context of this invention relates to flexural strength and / or compressive strength after curing. Flexural and compressive strengths can be determined in accordance with the EN 12190 standard. A measure of workability is the slump flow, measured in accordance with the EN 13391 standard. A measure of durability is the shrinkage rate, measured in accordance with the EN 12617-4 standard. In particular, low shrinkage and low expansion rates are indicators of increased durability.

[0010] Preferably, ultra-high strength refers to a compressive strength of 150 MPa or more for a fully cured hydraulic composition. Complete curing can be assumed to be achieved after curing at 25°C, 50% relative humidity, and 10¹³ millibars for 28 days.

[0011] Surprisingly, it has been found that a hydraulic composition having a balanced application amount of at least one pozzolan, aggregate, and cement dispersant with respect to Portland cement has advantageous strength, workability, and low shrinkage rate.

[0012] Therefore, the object of the present invention is solved by the subject matter of claim 1.

[0013] A further aspect of the present invention is the subject matter of the independent claims. Preferred embodiments are the subject matter of the dependent claims.

Mode for Carrying Out the Invention

[0014] Method for Carrying Out the Present Invention In a first aspect, the present invention is a) 100 parts by mass of Portland cement, b) at least one pozzolan of 20 to 60 parts by mass, preferably 45 to 55 parts by mass, c) at least one aggregate having an average particle size D 50 of 63 μm to 8 mm, preferably 200 μm to 3 mm, preferably sand of 30 to 120 parts by mass, preferably 50 to 85 parts by mass, d) 0.01 to 10 parts by mass of a cement dispersant, and e) 30 parts by mass or less of water, preferably 15 to 25 parts by mass relates to a hydraulic composition containing the same.

[0015] In the context of the present invention, a hydraulic material is a material that reacts with water to form solid hydrates. The solid hydrates are particularly calcium silicate hydrates and / or calcium aluminate hydrates. The hydraulic material is particularly cement, especially Portland cement. The hydraulic composition starts to harden when water is added.

[0016] A pozzolan is a material that reacts hydraulically (i.e., reacts with water to form solid hydrates) only in the presence of hydroxides, particularly in the presence of calcium hydroxide. This is called pozzolanic activity. In the context of the present invention, the term "pozzolan" also encompasses materials otherwise called potentially hydraulic materials. Portland cement can be a source of calcium hydroxide, for example, enabling the hydraulic reaction of pozzolans.

[0017] The Portland cement is preferably selected from at least one cement of the group consisting of CEM I, II, III, IV or V, most preferably type CEM I, in accordance with the EN 197-1 standard specification. Of course, Portland cement conforming to other standard specifications, such as ASTM or Chinese standard specifications, is also suitable.

[0018] The at least one type of pozzolan is preferably selected from clay, preferably calcined clay, particularly metakaolin, fly ash, slag, preferably ground granulated blast furnace slag, silica fume, or a mixture thereof. In particular, the hydraulic composition contains a mixture of fly ash and silica fume, or a mixture of ground granulated blast furnace slag and silica fume, or a mixture of ground granulated blast furnace slag, fly ash and silica fume.

[0019] Very preferably, in the hydraulic composition of the present invention, the at least one type of pozzolan is a mixture of fly ash and silica fume.

[0020] According to an embodiment, the hydraulic composition of the present invention contains a mixture of fly ash and silica fume, and the weight ratio of fly ash to silica fume is 2:1 to 10:1, preferably 6:1 to 7.5:1, more preferably 6:1 to 7:1.

[0021] The use of a mixture of fly ash and silica fume in such a weight ratio has proven particularly suitable for balancing the requirements of workability, durability, and strength. In particular, by using such a mixture of fly ash and silica fume, a small amount of water can be used in the hydraulic composition, thereby reducing shrinkage, especially plastic shrinkage, while simultaneously maintaining workability, measured, for example, as slump or slump flow, at a level satisfactory for practical application.

[0022] The fly ash may be Class C or Class F fly ash according to the ASTM C618 standard. Preferably, the fly ash is Class F fly ash according to the ASTM C618 standard.

[0023] The fineness of Portland cement is not particularly limited. However, it should be at least 2000 cm². 2 / g, preferably at least 2800cm 2 It is possible to use standard powder weights of Portland cement, such as Portland cement, with a Blaine powder weight of 1 / g. The maximum Blaine powder weight of Portland cement is, for example, 12,000 cm³. 2 It can be / g. Suitable Portland cement is, for example, 2800-6500 cm³. 2 It has a Blaine powder content of / g. In the context of this invention, Blaine powder content can be measured according to the DIN EN 196-6:2019-03 standard.

[0024] The particle size of at least one type of pozzolane is not particularly limited. However, the average particle size D is 0.5 μm to 1 mm, preferably 1 μm to 100 μm, and more preferably 2 μm to 50 μm. 50 It is possible to use a pozzolane having the following characteristics: At least one of these pozzolanes has a particle size D of 1 mm, preferably 500 μm or less, more preferably 150 μm or less, and even more preferably 80 μm or less. 90 It is particularly preferable to have this feature.

[0025] The particle size can be determined by laser light diffraction as described in the ISO 13320:2009 standard specification. In particular, a Mastersizer 2000 device equipped with a Hydro 2000G dispersion unit and Mastersizer 2000 software, commercially available from Malvern Instruments GmbH (Germany), can be used for this purpose. As a result of the particle size determination, one or more D x values are reported. The D x value means that the ratio of a given assembly of x% of the particles has a particle size lower than a given value. Thus, the D 90 value means, for example, that 90% of the assembly of particles has a particle size smaller than a given D 90 value. Thus, the average particle size corresponds in particular to the D 50 value (50% of the particles are smaller than a given value and 50% are correspondingly larger).

[0026] According to an embodiment, the hydraulic composition of the present invention further comprises 10 to 250, preferably 30 to 100 parts by mass of a filler having an average particle size D 50 less than 200 μm, preferably less than 150 μm, particularly less than 63 μm.

[0027] The filler within the context of the present invention is characterized by an average particle size D 50 less than 200 μm, preferably less than 150 μm, particularly less than 63 μm. The filler is a material that does not itself have hydraulic or pozzolanic activity. The filler can be selected from siliceous and / or carbonaceous materials. Preferred fillers within the context of the present invention are silica sand, fine calcium carbonate and / or pulverized rock powder, particularly pulverized limestone.

[0028] The aggregate within the context of the present invention has an average particle size D 50It has the following properties. Sand is a particularly preferred aggregate. The aggregate may and may be preferable to include parts of aggregate with different particle sizes. For example, with respect to the hydraulic composition of the present invention, it is preferable to include various parts of sand, such as a portion of sand with a particle size of 0.06 to 0.3 mm, another portion of sand with a particle size of 0.1 to 0.6 mm, another portion of sand with a particle size of 0.3 to 0.9 mm, another portion of sand with a particle size of 0.7 to 1.2 mm, and another portion of sand with a particle size of 1.5 to 2.2 mm. The particle size of the solid material in the mm range can be determined by sieve analysis in accordance with the EN 12192-1:2002 standard or the EN 933-1:2012 standard.

[0029] According to the embodiments, the hydraulic composition of the present invention comprises a cement dispersant which is a comb-shaped polymer.

[0030] In particular, comb-shaped polymers (i) General structure (I) [ka] The repeating unit A, and (ii) General structure (II) [ka] Repeating unit B Includes, In the above formula, R u Each of them is independently either a hydrogen atom or a methyl group. R v Each of these is independently of the other, either hydrogen or COOM, where M is H, an alkali metal, an alkaline earth metal, or an ammonium group. m = 0, 1, 2, or 3. p=0 or 1, R 1 These are independent of each other, -[YO] n -R 4 Here, Y is an alkylene group having 2 to 4 carbon atoms, and R 4 This is an alkyl, cycloalkyl, or alkylaryl group having H and 1 to 20 carbon atoms, with n=2 to 350. Repeating units A and B are present in the comb-shaped polymer in a molar ratio of A:B of 10:90 to 90:10.

[0031] The method for producing such comb-shaped polymers of the present invention is known in the art. For example, comb-shaped polymers can be produced by radical polymerization of ethylenically unsaturated monomers. Comb-shaped polymers having desired structures and properties can be obtained by specific selection and ratio of monomers. Such radical polymerization and the resulting comb-shaped polymers are described, for example, in International Publication No. 2012 / 084954. As an alternative method, comb-shaped polymers can be produced by polymer-like reactions. In this method, a polycarboxylic acid main chain is synthesized in the first step, and then side chains are attached to the polycarboxylic acid main chain, for example, by esterification. Such polymer-like reactions and the resulting comb-shaped polymers are described, for example, in European Patent No. 1138697 and International Publication No. 2005 / 090416.

[0032] The comb-shaped polymer of the present invention may have a random structure, or it may have a block or gradient structure. The terms "random," "block," and "gradient" refer to the distribution of monomer units A and B along the main chain of the polymer.

[0033] It is preferable that monomer units A and B are arranged in a block or gradient along at least one direction of the main chain.

[0034] The selection of structural parameters within the comb-shaped polymer of the present invention has been shown to affect workability. In particular, the selection of the molar ratio of monomer units A:B, the selection of parameters "n" and "p", and the arrangement of monomer units A and B in random, block, or gradient structures affect the effect on the workability of the resulting comb-shaped polymer.

[0035] The hydraulic composition of the present invention may further contain 1 to 5 parts by mass of a calcium sulfate source.

[0036] The calcium sulfate source may be gypsum, calcined gypsum, α-calcium sulfate hemihydrate, β-calcium sulfate hemihydrate, calcium sulfate dihydrate, and / or hard gypsum. Preferably, the calcium sulfate source is hard gypsum.

[0037] The hydraulic compositions of the present invention may further include fibers, preferably metal fibers or fibers made of thermoplastic materials, particularly steel fibers, coated steel fibers, such as brass-coated steel fibers, carbon fibers, or fibers made from polyethylene and / or polypropylene. The fibers may be coated, surface modified, embossed, and / or curved.

[0038] The additional use of fibers can further increase the strength of the hydraulic composition after curing, particularly the flexural strength and / or compressive strength. The fibers can also reduce the shrinkage of the hydraulic composition upon curing.

[0039] It is preferable to use fibers with a length of 5 to 50 mm. The diameter of the fibers may be in the range of 1 to 800 μm. However, it is also possible to use fibers of different dimensions.

[0040] The hydraulic composition of the present invention may further contain an antifoaming agent.

[0041] The hydraulic composition of the present invention may contain further additives or admixtures different from the components described above. These further additives or admixtures may particularly include accelerators, solidification retarders, foaming agents, leavening agents, viscosity modifiers such as thickeners, pigments, biocides, or mixtures thereof.

[0042] The hydraulic composition of the present invention preferably contains Portland cement and at least one type of pozzolann, preferably a mixture of silica fume and fly ash in a weight ratio of 2:1. In particular, in the hydraulic composition of the present invention, the weight ratio of Portland cement to fly ash is 2:1 to 3:1.

[0043] The hydraulic composition of the present invention preferably contains a filler and at least one type of pozzolann, preferably a mixture of silica fume and fly ash in a weight ratio of 1:1.

[0044] The hydraulic composition of the present invention preferably contains Portland cement and a filler in a weight ratio of 2:1.

[0045] In particular, in the hydraulic composition of the present invention, the weight ratio of Portland cement:filler:at least one type of pozzolann, preferably a mixture of silica fume and fly ash, is 2:1:1.

[0046] This weight ratio was found to be particularly suitable for balancing the workability, durability, and strength requirements of the hydraulic composition.

[0047] Preferred composition, a) Portland cement, 100 parts by mass, b) 45 to 55 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand in 30 to 120 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) Water in 30 parts by mass or less include.

[0048] Another preferred composition, a) Portland cement, 100 parts by mass, b) 45 to 55 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand, in 50 to 85 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) Water in 30 parts by mass or less include.

[0049] Another preferred composition, a) Portland cement, 100 parts by mass, b) 45 to 55 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand, in 50 to 85 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) 15-25 parts by mass of water include.

[0050] Another preferred composition, a) Portland cement, 100 parts by mass, b) 45 to 55 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand in 30 to 120 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) 15-25 parts by mass of water include.

[0051] Another preferred composition, a) Portland cement, 100 parts by mass, b) 20 to 60 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand in 30 to 120 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) 15-25 parts by mass of water include.

[0052] Another preferred composition, a) Portland cement, 100 parts by mass, b) 20 to 60 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm50 Having at least one type of aggregate, preferably sand, in 50 to 85 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) Water in 30 parts by mass or less include.

[0053] Another preferred composition, a) Portland cement, 100 parts by mass, b) 20 to 60 parts by mass of at least one type of pozzolane, c) Average particle size D of 63 μm to 8 mm, preferably 200 μm to 3 mm 50 Having at least one type of aggregate, preferably sand, in 50 to 85 parts by mass, d) 0.01 to 10 parts by mass of cement dispersant, and e) 15-25 parts by mass of water include.

[0054] In another aspect, the present invention relates to a method for producing the above-described hydraulic composition, wherein the method is a) A step of preparing a dry mix containing Portland cement, pozzolann, filler, and aggregate. b) A step of mixing water with the dry mix obtained in step a), The cement dispersant is added during the preparation of the dry mix in step a) and / or added together with the mixing water in step b).

[0055] The method for preparing the dry mix is ​​known to those skilled in the art. The dry mix is ​​a mixture containing water in an amount of 5% by weight or less, preferably 1% by weight or less, relative to the total weight of the dry mix.

[0056] In the context of the present invention, the dry mix can be stored for a long period of time, for example, in a silo or paper bag, before water is added. For example, the dry mix can be stored in a silo and transported to the construction site. Water can then be added at the construction site before use. When water is added, the hardening of the hydraulic composition begins.

[0057] However, it is also possible to mix the water in the factory, then store the wet mix for a specific period, and / or transport the wet mix to the construction site. The storage time before the wet mix begins to harden can be increased by using additional hardening retarders or inhibitors.

[0058] Preferably, when the cement dispersant is added during the preparation of the dry mix in step a), the cement dispersant takes the form of an easily flowable powder. Similarly, preferably, when the cement dispersant is added together with the mixing water in step b), the cement dispersant is dissolved or dispersed in the mixing water.

[0059] In another embodiment, the present invention relates to the use of hydraulic compositions described above or prepared by the methods described above for the construction of new buildings, for the repair of existing buildings, or as grouting materials.

[0060] In particular, the hydraulic composition of the present invention can be used in a system compliant with principles 3, 4, and 7 of EN 1504-3, or in a system compliant with EN 1504-6, or as a high-strength grout compliant with the DAfStb guideline VeBMR, or as a non-shrinking grout of classes A, B, and C compliant with ASTM C1107, or as an ultra-high-performance fiber-reinforced concrete compliant with SIA 2052, or as a screed compliant with EN 13813.

[0061] DIN EN 1504-3 relates to products and systems for the protection and repair of concrete structures. Principle 3 relates to concrete repair, Principle 4 relates to structural reinforcement, and Principle 7 relates to the preservation of passive repairs. Accordingly, the hydraulic composition of the present invention is particularly suitable for use as a mortar for concrete repair, as well as as a mortar, concrete or crack filler for structural reinforcement, and for increasing cover over reinforcing bars or as a replacement for carbonated concrete. EN 1504-6 relates to products and systems used for anchoring reinforcing bars. Accordingly, the hydraulic composition of the present invention is suitable for use in anchoring reinforcing bars. The DAfStb guideline VeBMR relates to grouting materials having high initial strength and compressive strength of class C50 / 60 or higher. Accordingly, the hydraulic composition of the present invention is suitable for use as a thin layer supplemental concrete material and cement mortar in grouting joints in sleeve foundations or in concrete pouring of columns, for example. Guideline SIA 2052 relates to ultra-high-performance fiber-reinforced concrete for load-bearing structures. Therefore, the hydraulic composition is suitable for use in the construction or renovation of load-bearing structures. EN 13813 relates to cement-based screed materials for indoor and outdoor applications. Therefore, the hydraulic composition of the present invention can be used as cement-based screed for indoor and outdoor applications.

[0062] The hydraulic composition of the present invention is preferably used at a temperature of 4 to 50°C. Heating is generally not required to cure the hydraulic composition of the present invention. The hydraulic composition of the present invention is preferably used at a pressure of approximately 1 bar. Generally, it is not necessary to increase or decrease the pressure to cure the hydraulic composition of the present invention.

[0063] In particular, the hydraulic composition of the present invention can be used in the construction, repair, and / or waterproofing of bridge decks.

[0064] In another embodiment, the present invention relates to a bridge deck comprising a hardened hydraulic composition prepared as described above or by the method described above.

[0065] According to a particular embodiment, the hardened hydraulic composition has a compressive strength of at least 120 MPa, preferably at least 140 MPa, after 28 days, as determined in accordance with EN 12190. [Examples]

[0066] Table 1 below provides an overview of the raw materials used.

[0067] [Table 1]

[0068] A dry mix was prepared by thoroughly mixing the dry materials shown in Table 2 using a V-mixer until visually uniform. Then, water was added in the amounts shown in Table 2, and mixing was continued for a further 5 minutes using a Hobart mixer.

[0069] Five minutes after mixing was complete, the slump flow was measured according to the EN 13391 standard. After 24 hours, the shrinkage was measured according to the EN 12617-4 standard. After the times shown in Table 2 below, the flexural strength (FS) was measured according to the EN 12190 standard. After the times shown in Table 2 below, the compressive strength (CS) was measured using a 40 × 40 × 160 mm prism according to the EN 12190 standard.

[0070] [Table 2]

[0071] The non-inventive examples shown in Table 2 demonstrate that when pozzolan material is added in amounts outside the claims (references 1, 3, and 4), hydraulic compositions cannot be prepared due to insufficient wetting. Reference 2 of the examples shows that when a large amount of water is used, the resulting grout exhibits low flexural strength.

[0072] [Table 3]

[0073] The embodiments of the present invention shown in Table 3 demonstrate that when the pozzolanic material and water are added in the amounts specified in the claims, high bending and compressive values ​​can be achieved without excessive shrinkage.

Claims

1. a) 100 parts by mass of Portland cement, b) 20 to 60 parts by mass, preferably 45 to 55 parts by mass, of at least one type of pozzolane. c) At least one type of aggregate having an average particle size D50 of 63 μm to 8 mm, preferably 200 μm to 3 mm, preferably sand, in amounts of 30 to 120 parts by mass, preferably 50 to 85 parts by mass. d) 0.01 to 10 parts by mass of cement dispersant (powder or liquid), and e) Water 30 parts by mass or less, preferably 15 to 25 parts by mass A hydraulic composition comprising:

2. The hydraulic composition according to claim 1, characterized in that the at least one type of pozzolann is selected from clay, preferably calcined clay, particularly metakaolin, fly ash, slag, preferably blast furnace slag powder, silica fume, or a mixture thereof.

3. The hydraulic composition according to claim 1 or 2, characterized in that the at least one type of pozzolann is a mixture of fly ash and silica fume.

4. The hydraulic composition according to claim 3, characterized in that the weight ratio of fly ash to silica fume is 2:1 to 10:1, preferably 6:1 to 7.5:1, and more preferably 6:1 to 7:

1.

5. The hydraulic composition according to any one of claims 1 to 4, characterized in that the cement dispersant is a comb-shaped polymer.

6. The comb-shaped polymer is (i) General structure (I) 【Chemistry 1】 The repeating unit A, and (ii) General structure (II) 【Chemistry 2】 Repeating unit B, Includes, In the above formula, R ｕ Each of them is independently either a hydrogen atom or a methyl group. R ｖ Each of these is independently either hydrogen or COOM, where M is H, an alkali metal, an alkaline earth metal, or an ammonium group. m = 0, 1, 2, or 3, p = 0 or 1, R １ Each is independent of the others, -[YO] ｎ -R ４ Here, Y is an alkylene group having 2 to 4 carbon atoms, and R ４ H is an alkyl, cycloalkyl, or alkylaryl group having 1 to 20 carbon atoms, and n = 2 to 350. The hydraulic composition according to claim 5, characterized in that the repeating units A and B are present in the comb-shaped polymer in a molar ratio of A:B of 10:90 to 90:

10.

7. The hydraulic composition according to any one of claims 1 to 6, further comprising 1 to 5 parts by mass of a calcium sulfate source, preferably hard gypsum.

8. Average particle size D less than 200 μm, preferably less than 150 μm, and particularly less than 63 μm. ５０ The hydraulic composition according to any one of claims 1 to 7, further comprising 10 to 250 parts by mass, preferably 30 to 100 parts by mass, of a filler having the above.

9. The hydraulic composition according to any one of claims 1 to 8, further comprising fibers, preferably metal fibers or fibers made of thermoplastic materials, particularly steel fibers, coated steel fibers, brass coated steel fibers, carbon fibers, or fibers made of polyethylene and / or polypropylene.

10. A hydraulic composition according to any one of claims 1 to 9, further comprising an antifoaming agent.

11. a) A step of preparing a dry mix containing Portland cement, pozzolann, filler, and aggregate, b) A step of mixing water with the dry mix obtained in step a), Includes, A method for producing a hydraulic composition according to any one of claims 1 to 10, wherein a cement dispersant is added during the preparation of the dry mix in step a) and / or added together with mixing water in step b).

12. Use of a hydraulic composition as described in any one of claims 1 to 10, or prepared by the method described in claim 11, for the construction of a new building, for the repair of an existing building, or as a grouting material.

13. A bridge deck comprising a hardened hydraulic composition as described in any one of claims 1 to 10, or prepared by the method described in claim 11.

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