Adjuvant combination of a milling assistant and a concrete admixture for accelerated hydration of cementitious binders

Patent metadata

Field	Value
Publication number	US-2016176758-A1
Application number	US-201414904458-A
Country	US
Kind code	A1
Filing date	Jul 9, 2014
Priority date	Jul 12, 2013
Publication date	Jun 23, 2016
Grant date	—

Abstract

An adjuvant combination composed of a milling assistant and a concrete admixture for a composition including cement, for accelerating cement hydration, wherein the milling assistant includes at least one amino alcohol and at least one cement hydration accelerator selected from chlorides, thiocyanates, nitrates, nitrites and hydroxides, and the concrete admixture includes a reaction product of at least one calcium compound with at least one silicon compound selected from a silicon dioxide compound, a silica compound and a silicate compound. Using the adjuvant combination produces a significant acceleration in the hardening of a composition including cement, after the addition of water. This is an advantage especially in the production of prefabricated concrete components, allowing quicker deshuttering.

First claim

1 . An admixture combination of a grinding aid and a concrete admixture for a composition comprising cement for accelerating cement hydration, where
the grinding aid comprises at least one amino alcohol and at least one cement hydration accelerator selected from chlorides, thiocyanates, nitrates, nitrites, and hydroxides, and the concrete admixture comprises a reaction product of at least one calcium compound with at least one silicon compound selected from a silicon dioxide compound, a silicic acid compound, and a silicate compound.

2 . The admixture combination of claim 1 , the at least one cement hydration accelerator being selected from a chloride, a thiocyanate, or a combination of a chloride and a thiocyanate, and/or the at least one amino alcohol being triethanolamine.

3 . The admixture combination of claim 1 , the grinding aid further comprising at least one glycol, the glycol being selected from diethylene glycol, propylene glycol, and dipropylene glycol.

4 . The admixture combination of claim 1 , the at least one silicon compound being a silica sol, waterglass, fumed silica, or precipitated silica.

5 . The admixture combination of claim 1 , the concrete admixture further comprising at least one comb polymer, the comb polymer.

6 . The admixture combination of claim 1 , the grinding aid comprising 10 to 40 wt % of the at least one cement hydration accelerator, 2 to 40 wt % of at least one amino alcohol, and 0 to 25 wt % of at least one glycol, based on the weight of the grinding aid, and the grinding aid comprising 5 to 25 wt % of one or more alkali and/or alkaline earth chlorides, 5 to 25 wt % of one or more alkali and/or alkaline earth thiocyanates, 2 to 30 wt % of one or more amino alcohols based on the weight of the grinding aid.

7 . The admixture combination of claim 1 , the ratio of the at least one calcium compound to the at least one silicon compound being selected such that the molar ratio of calcium to silicon is in the range from 0.1 to 2.5 in order to form the reaction product, and/or the reaction of the calcium compound with the silicon compound taking place in the presence of a solvent, in order to form the reaction product.

8 . A method for producing a component from a composition comprising cement with accelerated cement hydration, comprising
a) grinding clinker to cement, and optionally adding admixtures, additives and/or aggregates to the cement in order to obtain a composition comprising cement, b) mixing the composition comprising cement with tempering water, in order to obtain a fresh mortar or fresh concrete, c) installing the fresh mortar or fresh concrete onto a substrate or into shuttering, and optionally compacting it, and d) solidifying and hardening the fresh mortar or fresh concrete, and optionally deshuttering, in order to obtain the component, where in one of the steps a) and/or b) a grinding aid and a concrete admixture are added independently of one another, where
the grinding aid comprises at least one amino alcohol and at least one cement hydration accelerator selected from chlorides, thiocyanates, nitrates, nitrites, and hydroxides, and
the concrete admixture comprises a reaction product of at least one calcium compound with at least one silicon compound selected from a silicon dioxide compound, a silicic acid compound, and a silicate compound.

9 . The method of claim 8 , the grinding aid being metered in an amount such that the fraction of the grinding aid is in the range from 0.02 wt % to 1.0 wt %, based on the cement weight, and/or the concrete admixture is metered in an amount such that the fraction of the concrete admixture is in the range from 0.01 wt % to 30 wt %, based on the cement weight.

10 . The method of claim 8 , where
the grinding aid is added to the clinker, in order for the clinker to be ground to cement in the presence of the grinding aid, or the grinding aid ground with the cement, and/or the concrete admixture is added to the tempering water, in order for the tempering water comprising the concrete admixture to be mixed into the composition comprising cement, or the concrete admixture is added separately before, during, or after the addition of the tempering water to the composition comprising cement.

11 . The method of claim 8 , wherein a component mold is used as the shuttering and the component obtained after deshuttering is a precast concrete unit.

12 . The method of claim 8 , the grinding aid and/or the concrete admixture combination of at least one cement hydration accelerator being selected from a chloride, a thiocyanate, or a combination of a chloride and a thiocyanate, and/or the at least one amino alcohol being triethanolamine.

13 . A combination of a grinding aid and a concrete admixture in a composition comprising cement as hardening accelerator for accelerating cement hydration on addition of water, where
the grinding aid comprises at least one amino alcohol and at least one cement hydration accelerator selected from chlorides, thiocyanates, nitrates, nitrites, and hydroxides, the grinding aid optionally further comprising one or more cement additives selected form at least one or combination of glycol compounds, polymer compounds, or defoamers; and the concrete admixture comprises a reaction product of at least one calcium compound with at least one silicon compound selected from a silicon dioxide compound, a silicic acid compound, and a silicate compound.

14 . The combination in the composition of claim 13 , wherein the grinding aid and/or the concrete admixture being the at least one cement hydration accelerator being selected from a chloride, a thiocyanate, or a combination of a chloride and a thiocyanate, and/or the at least one amino alcohol being triethanolamine.

15 . A component obtainable by a method as defined in claim 8 .

Assignees

• Sika Technology Ag

Inventors

• Müller Thomas
• Bürge Christian
• Marazzani Beat
• Kurz Christophe

Classifications

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B28/04

  Portland cements · CPC title

• C04B24/122 Primary

  Hydroxy amines · CPC title

• C04B22/00863 Primary

  Calcium silicate hydrate · CPC title