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Silane-modified polycarboxylate water-reducer, concrete admixture using the water-reducer and preparation method thereof

A technology of concrete admixture and silane modification, which is applied in the fields of silane-modified polycarboxylate superplasticizer, concrete admixture, and chemical admixture, can solve the problems of inability to effectively control the slump loss of concrete too fast, and achieve chemical The effect of the admixture system is stable, the system is stable, and the workability is maintained

Active Publication Date: 2020-12-08
北京新桥技术发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there have been some technical achievements in the research and application of recycled concrete, but there are still significant constraints, mainly in that due to the high water absorption of recycled aggregates, it will have a direct impact on the slump of concrete after being put into it, and even through Adding ordinary water reducers and slump retaining agents can’t effectively control the problem of excessive concrete slump loss; therefore, to develop a chemical admixture for controlling the slump loss of recycled concrete to achieve good application of recycled concrete, Has important technical application value

Method used

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  • Silane-modified polycarboxylate water-reducer, concrete admixture using the water-reducer and preparation method thereof
  • Silane-modified polycarboxylate water-reducer, concrete admixture using the water-reducer and preparation method thereof
  • Silane-modified polycarboxylate water-reducer, concrete admixture using the water-reducer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0059] 1. Silane-modified polycarboxylate water reducer and its preparation method

[0060] In this example, a silane-modified polycarboxylate water-reducer was prepared. The raw materials used include: polyoxyethylene ether 10%, acrylic acid 32%, γ-methacryloxypropyl trimethoxysilane 1.8% by mass percentage %, ammonium persulfate 0.35%, 3-mercaptoacetic acid 0.18%, and the balance is deionized water.

[0061] Concrete preparation method comprises the following steps:

[0062] (1) Mix 10% (mass percentage, the same below) polyoxyethylene ether with a small amount of deionized water, put it in a three-necked flask and place it in a water bath, stir and pre-dissolve the mixture at a temperature of 30°C, and set aside;

[0063] (2) Mix 0.35% initiator ammonium persulfate, 32% acrylic acid and deionized water to prepare material A; 0.18% chain transfer agent 3-mercaptoacetic acid and deionized water to prepare material B; 1.8% monomer γ-formazol Acryloyloxypropyltrimethoxysilan...

Embodiment 2

[0077] Others are the same as in Example 1, except that n=20.

Embodiment 3

[0079] Others are the same as in Example 1, except that n=50.

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Abstract

The invention provides a silane modified polycarboxylate superplasticizer, a preparation method thereof, a concrete admixture using the superplasticizer, and a preparation method of the concrete admixture. The silane modified polycarboxylate superplasticizer comprises, by weight, 9.9-12.2% of polyoxyethylene ether, 31.5-33.8% of acrylic acid, 1.2-2.2% of gamma-methacryloxypropyltrimethoxysilane, 0.3-0.45% of ammonium persulfate, 0.15-0.25% of 3-mercaptoacetic acid, and the balance of deionized water. The concrete admixture comprises, by weight, 26-40% of the silane modified polycarboxylate superplasticizer, 0.02-0.08% of polyvinyl alcohol, 0.3-0.6% of sodium dodecyl benzene sulfonate, 4-8% of sodium gluconate, and the balance of water. The admixture has high water reducing property and slump retaining property, and is particularly beneficial to recycled concrete construction and quality control; and production materials are simple and easy to obtain, and the process is simple and feasible.

Description

technical field [0001] This application belongs to the technical field of building materials, and specifically relates to a silane-modified polycarboxylate water reducer, a concrete admixture using the water reducer and their respective preparation methods. Chemical admixtures for concrete slump loss. Background technique [0002] Recycling of waste concrete is an important link in the life cycle of concrete structures, and a key link to realize resource conservation, energy conservation and emission reduction in the field of engineering construction. Among them, reusing concrete recycled aggregates in concrete is a key technical means to realize the resource utilization of waste concrete. The development and application of recycled concrete, on the one hand, solves the problems of difficult disposal of a large amount of waste concrete and the resulting deterioration of the ecological environment; The damage caused by the ecological environment meets the requirements of su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/08C04B24/42C04B103/30
CPCC04B24/2694C04B40/0039C04B2103/302C08F283/065C08F220/06C08F230/085C04B24/2623C04B24/20C04B24/10
Inventor 吕思忠张述雄苏建明刘兆磊王凯路凯冀章清涛
Owner 北京新桥技术发展有限公司
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