Activation of ground granulated blast furnace slag, admixture for activating ground granulated blast furnace slag, and activated hydraulic composition

Abstract

The present invention relates to a method for activating ground granulated blast furnace slag (GGBS) with an admixture comprising triethanolamine and diethanolisopropanolamine. The present invention also relates to an admixture comprising triethanolamine and diethanolisopropanolamine. The present invention also relates to a hydraulic binder composition comprising GGBS, optionally Portland cement, triethanolamine, and diethanolisopropanolamine.

Description

[Technical Field]

[0001] The present invention relates to the activation of ground granulated blast furnace slag (GGBS) with an admixture comprising triethanolamine and diethanolisopropanolamine. In particular, the present invention relates to the activation of hydraulic compositions such as blended cements having a high content of GGBS. [Background technology]

[0002] Many building materials, especially concrete and mortar, rely on hydraulic binders. The most abundant hydraulic binder is cement, especially ordinary Portland cement (OPC). However, the use of cement, especially ordinary Portland cement, has a high environmental footprint. One of the main reasons is the high CO2 emissions associated with the production of cement. Therefore, many efforts are being made to at least partially replace cement as a binder from building materials.

[0003] One possibility is to use materials with cementitious properties, pozzolans and / or latent hydraulic materials as cement replacements. One particularly attractive material of this type is slag, since it is available as a plentiful by-product of various metallurgical processes, in particular iron and steel making.

[0004] One particular type of slag is ground granulated blast furnace slag (GGBS). GGBS is obtained by quenching molten iron slag from a blast furnace in water or steam to produce a glassy granular product, which is then dried and ground to a fine powder. It is known that GGBS can be used in the production of blended cements.

[0005] However, particularly with higher amounts of GGBS in blended cements, e.g., 50-80 wt. % or more of GGBS, slow setting, slow strength development, and lower strength, as measured over the conventional time frame of 28 days, are often observed when such blended cements are allowed to harden, e.g., as part of a concrete mix. Thus, there is a need to accelerate strength development, especially with higher amounts of GGBS in blended cements.

[0006] It is known that alkanolamines can function as stimulators for various types of slags. For example, WO 2022 / 238376 (Sika Technology AG) discloses the potential use of various alkanolamines to activate GGBS or basic oxygen furnace slag (BOF), a type of steelmaking slag.

[0007] There continues to be a need for stimulators of GGBS in blended cements, especially when such blended cements are high in GGBS. Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a method for activating ground granulated blast furnace slag. Another object of the present invention is to provide a stimulator for ground granulated blast furnace slag. In particular, an object of the present invention is to provide a method and a stimulator for activating ground granulated blast furnace slag in blended cements, especially blended cements having a high content of GGBS. A further object of the present invention is to provide an activated hydraulic binder composition comprising ground granulated blast furnace slag, especially blended cements having a high content of ground granulated blast furnace slag. [Means for solving the problem]

[0009] It has been found that a combination of triethanolamine and diethanolisopropanolamine is particularly suitable for activating ground granulated blast furnace slag, especially when used in blended cements with a high content of ground granulated blast furnace slag. When triethanolamine and diethanolisopropanolamine are used in combination, a synergistic effect on the activation of GGBS is obtained. Hydraulic binder compositions containing GGBS and containing triethanolamine and diethanolisopropanolamine surprisingly exhibit rapid strength growth during initial curing, for example, after one day. In particular, the combined use of triethanolamine and diethanolisopropanolamine to activate GGBS provides the following advantages: 1) Improved initial strength 2) Increased ultimate strength 3) Improving first train times 4) Minimize Portland clinker in blended cement

[0010] The object of the present invention is therefore solved by the subject matter of claim 1.

[0011] Further aspects of the invention are the subject matter of the independent claims. Preferred embodiments of the invention are the subject matter of the dependent claims. DETAILED DESCRIPTION OF THE INVENTION

[0012] In a first aspect, the present invention provides a method for activating ground granulated blast furnace slag, comprising: a) providing ground granulated blast furnace slag; b) providing an admixture comprising triethanolamine and diethanolisopropanolamine; c) mixing the ground granulated blast furnace slag with the admixture; The present invention relates to a method comprising:

[0013] In this context, the term "activation" refers to the ability to increase the reactivity of a mixture containing ground granulated blast furnace slag (GGBS) and water. Activation or increased reactivity in this case can be measured, for example, by determining the strength after a specified time. One suitable method is, for example, compressive strength measurement according to standard EN 12390-3. In such a method, an activated mixture containing GGBS and water exhibits a higher compressive strength within a specified time after mixing, for example, after one day or three days, than the same mixture without any added stimulant. Another suitable method is, for example, measurement of the initial burst time. The initial burst time can be measured, for example, by ultrasonic pulse velocity. In such a method, an activated mixture containing GGBS and water exhibits a faster initial burst time than the same mixture without any added stimulant.

[0014] In this regard, ground granulated blast furnace slag (GGBS) is obtained by quenching molten iron slag from a blast furnace in water or steam to produce a glassy granular product, which is then dried and ground to a fine powder. According to an embodiment, GGBS has a viscosity of 2000-12000 cm 2 / g, preferably 4000 to 6000 cm 2 / g or 6000 to 8000 cm 2 / g Blaine fineness. Blaine fineness can be measured in accordance with standard EN 196-6. According to an embodiment, the glassiness of the GGBS of the present invention is at least 80%, preferably at least 90%. According to an embodiment, the GGBS of the present invention has an SiO2 content of 34-40% by weight, a CaO content of 34-37% by weight, an Al2O3 content of 8-12% by weight, and a (CaO+MgO) / (Al2O3) ratio of 0.8-1.1. 3+ SiO2) by weight.

[0015] According to an embodiment, the admixture comprising triethanolamine and diethanolisopropanolamine is a one-component admixture. A one-component admixture means that both triethanolamine and diethanolisopropanolamine, and optionally additional chemicals, are present in one container. Preferably, in this case, the admixture is a homogeneous mixture such as a solution or dispersion. The additional chemical may be, for example, a solvent, particularly water. Providing the admixture comprising triethanolamine and diethanolisopropanolamine as a one-component admixture has the advantages of being simple to use and reducing the risk of using too much or insufficient triethanolamine or diethanolisopropanolamine.

[0016] According to an embodiment, the admixture comprising triethanolamine and diethanolisopropanolamine is a multi-component admixture, particularly a binary admixture. A binary admixture means that triethanolamine and diethanolisopropanolamine are present in two spatially separated containers. Additional chemicals may also be present in one or both components of the binary admixture. The additional chemicals may be, for example, a solvent, particularly water. Providing the admixture comprising triethanolamine and diethanolisopropanolamine as a binary admixture has the advantage that the amounts of triethanolamine and / or diethanolisopropanolamine used can be independently adjusted as needed.

[0017] The mixing of GGBS with the admixture containing triethanolamine and diethanolisopropanolamine is not particularly limited, and in particular, the mixing can be carried out by any means known to those skilled in the art.

[0018] According to an embodiment, GGBS and an admixture comprising triethanolamine and diethanolisopropanolamine are mixed during the grinding of granulated blast furnace slag. Thus, the admixture comprising triethanolamine and diethanolisopropanolamine is added to unground granulated blast furnace slag, which is then ground, for example, in a ball mill or vertical roller mill. Additionally or alternatively, the admixture comprising triethanolamine and diethanolisopropanolamine can also be added to the granulated blast furnace slag during grinding.

[0019] According to embodiments, the GGBS and the admixture comprising triethanolamine and diethanolisopropanolamine are mixed in a concrete mixer, a tumbling vessel, a mixing can, a propeller mixer, a plowshare mixer, or an air-agitated chamber. In particular, the GGBS and the admixture comprising triethanolamine and diethanolisopropanolamine may be mixed during the preparation of a hydraulic binder or hydraulic binder composition, such as dry mortar, wet mortar, or concrete.

[0020] Preferably, the mixing is carried out at a standard pressure of 1 atm and at a temperature of 15 to 50° C. However, other pressures and temperatures are possible.

[0021] According to an embodiment, in the method of the present invention, the ground granulated blast furnace slag forms part of the hydraulic binder.

[0022] In this context, a hydraulic binder is a material consisting of at least one hydraulic binder and / or latent hydraulic binder.

[0023] In particular, hydraulic binder refers to a substance that hardens due to a chemical reaction with water to form hydrates. Preferably, the hydrates formed are not water-soluble. Preferably, the hydraulic binder further comprises cement, in particular Portland cement. Portland cement is in particular a cement according to standard EN 197-1, in particular a cement of type CEM I. CEM I is also called ordinary Portland cement (OPC).

[0024] Therefore, in particular in the method according to the invention, the hydraulic binder comprises or consists of ground granulated blast furnace slag and Portland cement, in particular CEM I according to EN 197-1.

[0025] According to an embodiment, in the method of the present invention, the proportion of ground granulated blast furnace slag in the hydraulic binder is at least 36% by weight, preferably at least 50% by weight, more preferably at least 70% by weight, in particular at least 80% by weight, relative to the total dry weight of the hydraulic binder.

[0026] According to a particularly preferred embodiment, the hydraulic binder consists of a mixture of OPC and GGBS in a weight ratio of 3:7. According to embodiments, the weight ratio of OPC to GGBS may be less than 3:7, for example 1:4 or less or even 1:9 or less.

[0027] According to an embodiment, in the method of the present invention, the proportion of ground granulated blast furnace slag in said hydraulic binder is not more than 90% by weight, preferably not more than 80% by weight, relative to the total dry weight of the hydraulic binder.

[0028] Having a high content of GGBS in the hydraulic binder of the present invention is generally preferred as this reduces CO2 emissions.

[0029] Latent hydraulic binders are binders that can only set at a very slow rate due to a chemical reaction with water that produces hydrates. Typically, latent hydraulic binders require some kind of stimulant to set.

[0030] According to an embodiment of the method of the present invention, the ground granulated blast furnace slag forms part of the hydraulic binder in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is at least 36% by weight, preferably at least 50% by weight, more preferably at least 70% by weight, and in particular at least 80% by weight, based on the total dry weight of the hydraulic binder. In such a case, the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in particular 3:4.

[0031] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of ground granulated blast furnace slag binder is at least 50% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in particular 3:4 may be preferred.

[0032] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is at least 70% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in some cases it is particularly preferred that it is 3:4.

[0033] In the method of the present invention, ground granulated blast furnace slag forms part of a hard binder, particularly in combination with Portland cement, and the weight ratio of ground granulated blast furnace slag binder is at least 80% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in particular 3:4 may be preferred.

[0034] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is 50 to 90% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in some cases 3:4 is particularly preferred.

[0035] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is 70 to 90% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in some cases it is particularly preferred that it be 3:4.

[0036] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is 80 to 90% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 10:1 to 1:10, preferably 3:1 to 1:3, and in some cases it is particularly preferred that it be 3:4.

[0037] In the method of the present invention, the ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and it may be preferable that the weight ratio of the ground granulated blast furnace slag binder is at least 50% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is 3:4.

[0038] In the method of the present invention, the ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is preferably 50 to 90% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is preferably 3:4.

[0039] In the method of the present invention, ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is at least 80% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine may preferably be 3:4.

[0040] In the method of the present invention, the ground granulated blast furnace slag forms part of the hydraulic binder, particularly in combination with Portland cement, and the weight ratio of the ground granulated blast furnace slag binder is preferably 80 to 90% by weight, and the weight ratio of triethanolamine to diethanolisopropanolamine is preferably 3:4.

[0041] In another aspect, the present invention relates to an admixture comprising triethanolamine and diethanolisopropanolamine. In particular, such an admixture is suitable for use in the method of the present invention. Accordingly, all of the above-mentioned embodiments also relate to this aspect. In particular, the admixture may be a one-component or multi-component, preferably two-component, admixture as described above.

[0042] According to an embodiment, the weight ratio of triethanolamine to diethanolisopropanolamine in the admixture of the invention is between 10:1 and 1:10, preferably between 3:1 and 1:3, in particular 3:4.

[0043] The admixture of the present invention can contain other components in addition to triethanolamine (TEA) and diethanolisopropanolamine (DEIPA). In particular, such other components can be a solvent, preferably water, a defoamer, a biocide, a thickener, a plasticizer, a superplasticizer, a retarder, and / or a cement accelerator other than an alkanolamine. The accelerator other than an alkanolamine can be calcium nitrite, calcium nitrate, sodium nitrite, sodium nitrite, calcium chloride, sodium thiocyanate, an alkali metal silicate, an alkali metal hydroxide, an alkali metal carbonate, aluminum sulfate, sodium silicate, and / or hydrated lime. Suitable retarders are, for example, hydroxycarboxylic acids, such as citric acid, lactic acid, or tartaric acid, or sodium gluconate. Thus, the admixture of the present invention may contain triethanolamine and diethanolisopropanolamine, at least one of calcium nitrite, calcium nitrate, calcium chloride, sodium thiocyanate, alkali metal silicate, alkali metal hydroxide, alkali metal carbonate, and aluminum sulfate, optionally a hydroxycarboxylic acid such as citric acid, lactic acid, or tartaric acid, or sodium gluconate, and water. One particularly suitable admixture of the present invention contains triethanolamine, diethanolisopropanolamine, a hydrocarboxylic acid, particularly lactic acid, sodium nitrate, sodium thiocyanate, optionally a biocide, and water. Another particularly suitable admixture of the present invention contains triethanolamine, diethanolisopropanolamine, a hydrocarboxylic acid, particularly lactic acid, sodium nitrate, sodium thiocyanate, a polycarboxylate ether, optionally a biocide, and water.

[0044] Such preferred admixtures may also be advantageously used in the aforementioned methods. According to an embodiment, the admixtures used in the methods of the present invention further contain at least one of sodium thiocyanate, sodium nitrate, a hydrocarboxylic acid, in particular lactic acid, and a polycarboxylate ether.

[0045] According to an embodiment, the proportion of triethanolamine in the admixture of the invention is 3% by weight and the proportion of diethanolisopropanolamine by weight is 3% by weight, preferably 4% by weight.

[0046] The combination of triethanolamine and diethanolisopropanolamine exhibits synergistic activation of GGBS, particularly in blended cements, and preferably in hydraulic binders comprising or consisting of GGBS and Portland cement.

[0047] Without wishing to be bound by theory, it is believed that mixtures of triethanolamine and diethanolisopropanolamine are particularly effective at improving the hydration of aluminate phases (C3A, C4AF) and alite (C3S) from GGBS and promoting the formation of ettringite (Aft). One possible mechanism of action is attack of the glassy phase of GGBS by triethanolamine and diethanolisopropanolamine, facilitating the migration of elements from GGBS into solution.

[0048] In another aspect, the present invention provides a method for producing a composition comprising: (a1) at least one ground granulated blast furnace slag; (a2) optionally Portland cement; and (b) triethanolamine; (c) diethanolisopropanolamine; (d) optionally aggregates and / or fillers; (e) optionally, further admixtures; The present invention relates to a hydraulic binder composition comprising:

[0049] The hydraulic binder composition comprises at least one hydraulic binder and / or latent hydraulic binder, and preferably comprises a latent hydraulic binder and a hydraulic binder. The latent hydraulic binder and the hydraulic binder are as described above.

[0050] The GGBS and Portland cement of this embodiment are as described above.

[0051] The other embodiments mentioned above also apply to this aspect. It can be particularly advantageous if the hydraulic binder composition further comprises at least one of a hydrocarboxylic acid, in particular lactic acid, sodium nitrate, sodium thiocyanate and a polycarboxylate ether.

[0052] The aggregate can be any material that is non-reactive in the hydration reaction of the binder. The aggregate can be any aggregate typically used in construction materials. Typical aggregates are, for example, rock, crushed stone, gravel, and sand, especially silica sand, river sand, and / or crushed sand. Typically, the aggregate is divided into different sieve lines. Often, several aggregates of different sieve lines are used together in one hydraulic binder composition. The aggregate can have a grain size of 0.063 to 32 mm. Preferably, 90% of the aggregate has a grain size greater than 0.063 mm. For example, the hydraulic binder composition of the present invention can contain sand with a grain size of 0 to 4 mm and / or gravel with a grain size of 4 to 8, 8 to 16, and / or 16 to 32 mm.

[0053] The term "filler" refers to a finely grained calcareous or siliceous material. One very typical filler is crushed limestone. The particle size of the filler is smaller than the particle size of the aggregate. For example, the filler may have a particle size of less than 0.063 mm. In particular, 90% of the filler has a particle size of less than 0.063 mm.

[0054] The further admixture in the hydraulic composition of the present invention is an admixture different from triethanolamine and diethanolisopropanolamine. According to an embodiment, the further admixture is selected from the group consisting of plasticizers, superplasticizers, shrinkage-reducing agents, air-entraining agents, degassing agents, stabilizers, viscosity modifiers, thickeners, water-reducing agents, retarders, waterproofing agents, fibers, foaming agents, defoamers, redispersible polymer powders, dust suppressants, chromate inhibitors, pigments, biocides, rust inhibitors and steel passivators.

[0055] The hydraulic binder composition of the present invention may further comprise a latent hydraulic or pozzolanic binder different from the ground steel slag, such as clay, calcined clay, especially metakaolin, kiln dust, microsilica, fly ash, pyrogenic silica, precipitated silica, silica fume, zeolite, rice husk ash, calcined oil shale, and natural pozzolans such as pumice and tulsa.

[0056] According to an embodiment, in the hydraulic binder composition of the invention, triethanolamine is present in an amount of 0.0025 to 0.25% by weight, preferably 0.0025 to 0.01% by weight or 0.012 to 0.03% by weight, and diethanolisopropanolamine is present in an amount of 0.005 to 0.05% by weight, preferably 0.005 to 0.01% by weight or 0.01 to 0.04% by weight, in each case relative to the total dry weight of the hydraulic binder composition. It has been found that when triethanolamine is used in an amount of more than 0.25% by weight, it acts as a retarder, whereas when used in amounts higher than 1% by weight, it acts as a flash-setting accelerator.

[0057] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 36 to 90% by weight, preferably 50 to 80% by weight, of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 10 to 64% by weight, preferably 20 to 50% by weight, of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.0025 to 0.25% by weight, preferably 0.0025 to 0.01% by weight or 0.012 to 0.03% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.005 to 0.05% by weight, preferably 0.005 to 0.01% by weight or 0.01 to 0.04% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0058] In particular, the hydraulic binder composition comprises 10-30% by weight of a hydraulic binder and 30-80% by weight of aggregate and / or filler.

[0059] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 50 to 80% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 20 to 50% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.0025 to 0.01% by weight of triethanolamine based on the total dry weight of the hydraulic binder; c) 0.005 to 0.01% by weight of diethanol isopropanolamine based on the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0060] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 50 to 80% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 20 to 50% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.015 to 0.02% by weight of triethanolamine based on the total dry weight of the hydraulic binder; c) 0.01 to 0.02% by weight of diethanol isopropanolamine based on the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0061] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 50% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 50% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.03% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.04% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0062] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 70% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 30% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.012% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.016% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0063] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 80% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 20% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.03% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.04% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0064] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 70% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 30% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.01% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.01% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0065] According to an embodiment, the hydraulic binder composition of the present invention comprises: a) a hydraulic binder, a1) 80% by weight of at least one ground granulated blast furnace slag based on the total dry weight of the hydraulic binder; a2) 20% by weight of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.015% by weight of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.02% by weight of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; Includes.

[0066] According to an embodiment, the hydraulic composition of the present invention further contains at least one of sodium thiocyanate, sodium nitrate, hydrocarboxylic acids, in particular lactic acid, and polycarboxylate ethers.

[0067] In another aspect, the present invention relates to a wet mortar or concrete comprising the hydraulic binder composition described above and water.

[0068] The weight ratio of water to hydraulic binder is preferably in the range of 0.2 to 0.6.

[0069] In another aspect, the present invention relates to a molded body obtained by hardening the aforementioned wet mortar or concrete. [Example]

[0070] The following chemicals were used in the examples: CEM I was ordinary Portland cement CEM I according to standard EN 197-1; GGBS was Purfleet from Hanson Cement, UK; triethanolamine (TEA), diethanolisopropanolamine (DEIPA), triisopropanolamine (TIPA), N-methyldiethanolamine (MDEA), sodium nitrate, lactic acid, and sodium thiocyanate were purchased at high purity from Sigma-Aldrich and used as received; the PCE-based superplasticizer was Sika ViscoCrete®-10, available from Sika UK.

[0071] Example 1 Mortars were prepared by mixing ground granulated blast furnace slag (GGBS) with the types and amounts (% by weight based on the amount of GGBS) of alkanolamines shown in Table 1 below and water in an amount such that the weight ratio of GGBS to water was 0.5. The mixing water contained a PCE-based superplasticizer (0.5% by weight based on the total dry weight of the hydraulic binder). Mixing continued for 3 minutes using a Megamixer, followed by vigorously mixing by hand for 30 seconds.

[0072] The slump was measured according to standard EN 12350-2. The compressive strength was measured according to standard EN 12390-3.

[0073] [Table 1]

[0074] Example 2 To prepare the mortar, 225 g of CEM I, 525 g of ground granulated blast furnace slag, 1227 g of limestone (10 mm), and 1840 g of sand (0-4 mm) were dry mixed in a Megamixer for 30 seconds. Mixing water (0.5 wt. / c. ratio), PCE-based superplasticizer (0.5 wt.% based on the total dry weight of the hydraulic binder), and the types and amounts of alkanolamines (wt.% based on the total dry weight of the hydraulic binder) shown in Table 2 below were added, and mixing continued in the Megamixer for 3 minutes, followed by vigorously mixing by hand for 30 seconds.

[0075] Slump and compressive strength were measured as in Example 1.

[0076] [Table 2]

[0077] Example 3 To prepare the mortar, the amounts of CEM I and ground granulated blast furnace slag shown in Table 3 below, 1227 g of limestone, and 1840 g of sand (0-4 mm) were dry mixed in a Megamixer for 30 seconds. TEA, TIPA, and / or DEIPA in the amounts (relative to the total dry weight of the hydraulic binder) shown in Table 3 below were added along with a PCE-based superplasticizer (0.5 wt. % relative to the total dry weight of the hydraulic binder) and mixing water (to obtain a water to binder ratio of 0.5). Mixing continued for 3 minutes using the Megamixer, followed by vigorously mixing by hand for 30 seconds.

[0078] Compressive strength was measured as in Example 1.

[0079] [Table 3]

[0080] [Table 4]

[0081] Example 4 To prepare the mortar, the amounts of CEM I and ground granulated blast furnace slag shown in Table 4 below, 1227 g of limestone, and 1840 g of sand (0-4 mm) were dry mixed in a Megamixer for 30 seconds. Mixing water, a PCE-based superplasticizer (0.5 wt.% based on the total dry weight of the hydraulic binder), and admixtures containing TEA (3 wt.%), DEIPA (4 wt.%), sodium nitrate (14 wt.%), lactic acid (4.5 wt.%), and sodium thiocyanate (21 wt.%) in water were used in the amounts (based on the total dry weight of the hydraulic binder) shown in Table 4 below. The total w / c ratio was as shown in Table 4 below. Mixing using the Megamixer continued for 3 minutes, followed by vigorously mixing by hand for 30 seconds.

[0082] Slump and compressive strength were measured as in Example 1.

[0083] [Table 5]

[0084] Example 5 The mortar of Example 5 was prepared in the same manner as Example 4. Table 5 below shows the details of each mixture and the measurement results. For the mortar of Example 5, the amount of TEA and DEIPA in the admixture was varied as shown in Table 5 below.

[0085] Slump and compressive strength were measured as in Example 1.

[0086] [Table 6]

Claims

1. A method for activating ground granulated blast furnace slag, comprising: a) providing ground granulated blast furnace slag; b) providing an admixture comprising triethanolamine and diethanolisopropanolamine; c) mixing the ground granulated blast furnace slag with the admixture; A method comprising:

2. 2. The method of claim 1, wherein the ground granulated blast furnace slag forms part of a hydraulic binder.

3. 3. The method according to claim 2, characterized in that the hydraulic binder comprises or consists of ground granulated blast furnace slag and Portland cement, in particular CEM I according to EN 197-1.

4. 4. The method according to claim 2 or 3, characterized in that the proportion of ground granulated blast furnace slag in the hydraulic binder is at least 36% by weight, preferably at least 50% by weight, more preferably at least 70% by weight, in particular at least 80% by weight, based on the total dry weight of the hydraulic binder.

5. The method according to any one of claims 2 to 4, characterized in that the proportion of ground granulated blast furnace slag in the hydraulic binder is not more than 90% by weight, preferably not more than 80% by weight, based on the total dry weight of the hydraulic binder.

6. 6. The method according to any one of claims 1 to 5, characterized in that the admixture further comprises at least one of sodium thiocyanate, sodium nitrate, hydrocarboxylic acids, in particular lactic acid, and polycarboxylate ethers.

7. 7. An admixture for use in the method of any one of claims 1 to 6, comprising triethanolamine and diethanolisopropanolamine.

8. 8. The admixture according to claim 7, characterized in that the weight ratio of triethanolamine to diethanolisopropanolamine is between 10:1 and 1:10, preferably between 3:1 and 1:3, in particular 3:

4.

9. 9. The admixture of claim 7 or 8, further comprising at least one of calcium nitrite, calcium nitrate, calcium chloride, sodium thiocyanate, alkali metal silicates, alkali metal hydroxides, alkali metal carbonates, aluminum sulfate, a hydroxycarboxylic acid, in particular citric acid, lactic acid or tartaric acid, sodium gluconate, and water.

10. (a1) at least one ground granulated blast furnace slag; (a2) optionally Portland cement; and (b) triethanolamine; (c) diethanolisopropanolamine; (d) optionally aggregates and / or fillers; (e) optionally, further admixtures; A hydraulic binder composition comprising:

11. 11. Hydraulic binder composition according to claim 10, characterized in that triethanolamine is present in an amount of 0.0025 to 0.25% by weight, preferably 0.0025 to 0.01% by weight or 0.012 to 0.03% by weight, and diethanolisopropanolamine is present in an amount of 0.005 to 0.05% by weight, preferably 0.005 to 0.01% by weight or 0.01 to 0.04% by weight, in each case relative to the total dry weight of the hydraulic binder composition.

12. a) a hydraulic binder, a1) 36 to 90% by weight, preferably 50 to 80% by weight, of at least one ground granulated blast furnace slag, based on the total dry weight of the hydraulic binder; a2) 10 to 64% by weight, preferably 20 to 50% by weight, of Portland cement based on the total dry weight of the hydraulic binder A hydraulic binder comprising: b) 0.0025 to 0.25% by weight, preferably 0.0025 to 0.01% by weight or 0.012 to 0.03% by weight, of triethanolamine relative to the total dry weight of the hydraulic binder; c) 0.005 to 0.05% by weight, preferably 0.005 to 0.01% by weight or 0.01 to 0.04% by weight, of diethanolisopropanolamine relative to the total dry weight of the hydraulic binder; d) aggregates and / or fillers; e) optionally, further admixtures; 12. The hydraulic binder composition according to claim 10 or 11, comprising:

13. 13. Hydraulic binder composition according to any one of claims 10 to 12, characterized in that it further contains at least one of sodium thiocyanate, sodium nitrate, hydrocarboxylic acids, in particular lactic acid, and polycarboxylate ethers.

14. A wet mortar or concrete comprising the hydraulic binder composition according to any one of claims 10 to 13 and water.

15. A molded article obtained by hardening the wet mortar or concrete according to claim 14.

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