KR100579778B1 - Multipurpose Mixture for Hydraulic Cement Composition - Google Patents

Abstract

The multipurpose hydraulic cement composition mixture according to the invention comprises a curing accelerator, preferably a calcium salt, and a fatty acid aminosulfonic acid surfactant. Other mixtures further comprise a reducing agent such as lignosulfonate, and / or an initial strength enhancer such as alkanolamine.

Description

Multi-Purpose Mixture for Hydraulic Cement Composition

The present invention relates to a blend for hydraulic cement compositions, and more particularly to a multipurpose blend that combines hardening acceleration and air entrainment properties.

The term "hydraulic cement" refers to cement that is cured by chemical reaction or reaction with water. It is known that certain properties of hydraulic cement can be changed by the addition of numerous chemical additives. For example, it is known to add calcium nitrate as a curing accelerator. However, calcium nitrate may be incompatible when combined in other types of additives, chemicals, and chemicals and in hydratable cement mixtures. In the present invention, the inventors have discovered a novel combination of chemical additives for simultaneously acquiring numerous properties in hydraulic cement compositions.

summary

The present invention relates to a multifunctional hydraulic cement composition comprising a curing accelerator which is an alkali or alkaline earth metal salt which is a salt of an organic or inorganic acid and a fatty acid aminosulfonic acid surfactant.

In a preferred embodiment, the cure accelerator is a calcium salt such as calcium nitrate, calcium chloride, calcium formate, or calcium nitrite; And the general formula _{CH 3 (CH 2) x -CH} = CH (CH 2) y -CO-NR- (CH 2) z -SO 3 - a fatty acid-amino acid having a M ^{n +.} In the above formula, "R" is H, an alkyl group or an aryl group; "x" is 1 to 10; "y" is 3 to 10; "z" is 1 to 10; "M" is an alkali or alkaline earth metal, ammonium, or alkyl ammonium ion; And "n" is 1 to 3.

In a more preferred mixture formulation, the curing accelerator comprises calcium nitrate and the surfactant is of formula CH ₃ (CH ₂ ) ₇ -CH = CH (CH ₂ ) ₇ -CO-N (CH ₃ ) CH ₂ CH ₂ SO Sodium N-methyl oleoyl taurate with ₃ ^- Na ⁺ .

Another preferred multifunctional hydraulic cement mixture of the present invention further comprises a sensitizer, an initial strength enhancer and preferably both in addition to a cure accelerator and a surfactant. The sensitizer may include lignosulfonate, such as calcium lignosulfonate. Initial strength enhancers may include alkanolamines, preferably triethanolamine.

Accordingly, preferred multifunctional hydraulic cement composition mixtures of the present invention may include fatty acid aminosulfonic acid surfactants that appear to act as cure accelerators, water reducing agents, initial strength enhancers, and air entrainers. Although several of these functions could be combined simultaneously in one mixture formulation, not to mention all of the four functional ingredients described above, any combination of such functional ingredients, such as a combination of a curing accelerator and a surfactant, is disclosed by the prior art. Or not proposed.

The present invention also relates to a hydraulic cement mixture comprising the above and below multifunctional mixtures, including concrete mixtures.

As used herein, the term “cement composition” refers to pastes, mortars, and concrete compositions comprising hydraulic cement binders. The term is a term in the art. The paste is a mixture consisting of a hydraulic cement binder such as Portland cement alone or in combination with other components such as fly ash, silica steam or blast furnace slag, and water; Mortar is a paste further comprising fine aggregate; In addition, concrete is mortar which further contains coarse aggregate. The cement composition of the present invention is formed by mixing the required materials applicable to the particular cement composition to be produced, such as hydraulic cement, water and fine aggregate or coarse aggregate in a predetermined amount.

As used herein, the term "concrete" includes a mixture of said hydraulic cement and inert aggregate. Typical aggregates include conventional "coarse" aggregates such as gravel, granite, limestone, quartz sieves as well as materials commonly known as "cup" aggregates such as sand and fly ash. Conventional hydraulic cement concrete, such as Portland cement concrete, uses the aggregate in its hardened product in a major amount, ie at least 50% by volume, generally up to about 75% by volume.

The present invention relates to a hydraulic cement composition mixture comprising a hardening promoting component, preferably calcium nitrate, and a fatty acid aminosulfonic acid surfactant component, preferably sodium N-methyl oleoyl taurate. Other preferred mixtures include water reducing agents such as alkanolamines and more preferably triethanolamine; Further comprises an initial strength enhancing component such as lignosulfonate and preferably calcium lignosulfonate; More preferably, the mixture also contains both triethanolamine and calcium lignosulfonate. The admixture components can be mixed into a stable solution using conventional mixing equipment.

The hardening promoting component can be any compound that reduces the time required for the cement composition to cure when added to the cement composition. For example, alkali or alkaline earth metal salts that are salts of organic or inorganic acids can be used. Although not limited to the following list, examples of such compounds include nitrates, nitrites and formates of alkali or alkaline earth metals; Alkali or alkaline earth metal salts of group (VII) halogen and pseudohalogenic acid, such as chlorides, bromides, iodides, cyanides, cyanates, azides and thiocyanates of alkali or alkaline earth metals; Thiosulfates and perchlorates of alkali or alkaline earth metals; And aluminates, silicates and hydroxides of alkali or alkaline earth metals such as sodium hydroxide. Calcium salts, in particular calcium nitrate, calcium chloride, calcium formate and calcium nitrite are particularly advantageous. Calcium nitrate is preferred.

Fatty acid-amino acid that appears to be acting air-entraining agent in a hydroponic cement composition of the formula _{CH 3 (CH 2) x -CH} = CH (CH 2) y -CO-NR- (CH 2) z -SO 3 - M ^{n +} having a Alkali or alkaline earth metal salts of N-alkyl-N-tol oil aminosulfonic acid. In the above formula, "R" is H, an alkyl group or an aryl group; "x" is 1 to 10; "y" is 3 to 10; "z" is 1 to 10; "M" is an alkali or alkaline earth metal, ammonium, or alkyl ammonium ion; And "n" is 1 to 3.

Preferred fatty acid aminosulfonic acid surfactants include sodium N-methyl-N-oleoyl taurate (trade name Igepon T-33, purchased from Rhone-Poulenc, Cranberry, NJ).

The sensitizer may be an alkali or alkaline earth metal salt of lignosulfonic acid, polycarboxylic acid, naphthalene sulfonic acid condensate, melamine sulfonic acid condensate, hydroxide carboxylic acid and carbohydrates such as corn syrup. Preferred sensitizers are lignosulfonates such as calcium lignosulfonate.

Initial strength enhancers are known and the term “initial strength” means compressive strength at 1 to 3 days (see, eg, ASTM C-39). Initial strength enhancers include alkanolamines. Alkanolamines are generic to groups of compounds in which trivalent nitrogen is directly bonded to the carbon atom of an alkyl alcohol, examples being monoethanolamine, diethanolamine and triethanolamine. Alkanolamines also include methyldiethanolamine and triisopropanolamine.

Preferred multifunctional mixtures of the present invention are preferably used in an amount of 0.05 to 1.0% s / s based on cement in concrete, where "% s / s" is the percentage of the mixture solids relative to the cement solids. Preferred mixtures may comprise 90 to 99.5% s / s calcium nitrate and 0.5 to 10.0% s / s sodium N-methyl oleoyl taurate. Other preferred mixtures include calcium nitrate (50-90% s / s); Calcium lignosulfonate (5.0-40.0% s / s); Triethanolamine or triisopropanolamine (0.1-5.0% s / s); And sodium N-methyl oleoyl taurate (0.01-5.0% s / s).

Claims (11)

A multifunctional hydraulic cement composition mixture comprising a curing accelerator selected from the group consisting of calcium nitrate, calcium chloride, calcium formate and calcium nitrite and a fatty acid aminosulfonic acid surfactant. The method of claim 1, wherein the fatty acid-amino acid formula _{CH 3 (CH 2) x -CH} = CH (CH 2) y -CO-NR- (CH 2) z -SO 3 - , characterized in that it has a M ^{n +} Mixed material: Where "R" is H, an alkyl group or an aryl group; "x" is 1 to 10; "y" is 3 to 10; "z" is 1 to 10; "M" is an alkali or alkaline earth metal, ammonium, or alkyl ammonium ion; And "n" is 1 to 3. 3. A mixture according to claim 2, wherein said fatty acid aminosulfonic acid comprises sodium N-methyl oleoyl taurate. The mixture according to claim 2, further comprising a water reducing agent comprising an alkali metal salt or an alkaline earth metal salt of a compound selected from the group consisting of lignosulfonic acid, polycarboxylic acid, naphthalene sulfonic acid condensate, melamine sulfonic acid condensate, hydroxide carboxylic acid and carbohydrate. . The mixture of Claim 4 in which the said water reducing agent contains calcium lignosulfonic acid. The mixture of claim 2 further comprising an initial strength enhancer. 7. The blend according to claim 6, wherein the initial strength enhancer comprises alkanolamine. 8. A mixture according to claim 7, wherein said alkanolamine comprises triethanolamine or triisopropanolamine. The method of claim 1, wherein the cure accelerator comprises calcium nitrate, the fatty acid aminosulfonic acid surfactant comprises sodium N-methyl oleoyl taurate, and the mixture further comprises calcium lignosulfonate and triethanolamine Mixed material. A hydraulic cement composition comprising portland cement, a calcium salt cure accelerator, and a fatty acid aminosulfonic acid surfactant. The cement composition of claim 10 further comprising aggregate.