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Poly carboxylic acid series compound water reducing agent used for hydraulic self-compacting concrete and preparation method and application

A self-compacting concrete, polycarboxylic acid-based technology, applied in the field of water-reducing agent, can solve the problem that the performance requirements of hydraulic self-compacting concrete cannot be well met, and can fill the market gap, improve workability, and have great application value. and market demand

Inactive Publication Date: 2016-02-03
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the performance of existing polycarboxylate superplasticizers cannot well meet the performance requirements of hydraulic self-compacting concrete.

Method used

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  • Poly carboxylic acid series compound water reducing agent used for hydraulic self-compacting concrete and preparation method and application
  • Poly carboxylic acid series compound water reducing agent used for hydraulic self-compacting concrete and preparation method and application
  • Poly carboxylic acid series compound water reducing agent used for hydraulic self-compacting concrete and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The composition and ratio of polycarboxylate compound water reducer for hydraulic self-compacting concrete are as follows:

[0030] Low air-entraining polyether polycarboxylate superplasticizer 258 kg, polyether polycarboxylate slump retaining agent 110 kg, methyl cellulose 5 kg, xanthan gum 5 kg Hydroxy carboxylate 10 kg, polysaccharide 10 kg, polyether 2 kg of similar air-entraining agent.

Embodiment 2

[0032] This example provides a polycarboxylate composite water reducer for hydraulic self-compacting concrete suitable for direct use, which is obtained by uniformly dispersing all the components in Example 1 in 600 kg of water. When mixing, the water-reducing component and the slump-preserving component are added into the water and mixed evenly, then the thickening component, retarding component and air-entraining component are added in sequence, and mixed evenly.

[0033] Since the water reducer is usually prepared into a liquid with a certain concentration of each effective component and water when it is used. Therefore, this embodiment provides a compound water reducer with a common concentration that can be used directly. Since both the low air-entraining polyether polycarboxylate water reducer and the polyether polycarboxylate slump retaining agent in Example 1 are mother liquors, the two components are now mixed in water when mixing, and then the other components Mix i...

Embodiment 3

[0035] When the water reducer is used, the components are generally uniformly mixed in water to obtain a liquid water reducer and then used in concrete. Therefore, in this example, the water reducer of Example 2 is used in concrete, and the amount of the water reducer of Example 2 is 1.5% to 2.5% of the total weight of cementitious materials (including cement and admixtures). When the water reducer of this embodiment is used in concrete, the amount equivalent to the solid mass is generally 0.2% to 0.6% of the total weight of the cementitious material of the concrete.

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Abstract

The present invention discloses a poly carboxylic acid series compound water reducing agent used for hydraulic self-compacting concrete and a preparation method and application, the poly carboxylic acid series compound water reducing agent comprises the following components by weight: 50 % to 80% of a water-reducing component; 5% to 40% of a slump retaining component; 1% to 10% of a thickening component; 1% to 20% of a retarding component; and 0.1% to 2% of an air entraining component. The poly carboxylic acid series compound water reducing agent improves the workability, fluidity, segregation resistance and slump retaining properties of the self-compacting concrete.

Description

technical field [0001] The invention relates to the technical field of water reducers, in particular to a polycarboxylic acid compound water reducer for hydraulic self-compacting concrete and its preparation method and application. Background technique [0002] Self-compacting concrete refers to the concrete that can flow and compact under its own gravity, and can completely fill the formwork even if there are dense steel bars, and at the same time obtain good homogeneity and do not require additional vibration. Self-compacting concrete solves the contradiction between the reduction of skilled workers and the improvement of the durability of concrete structures, and is called "the most revolutionary development of concrete construction technology in recent decades". The hardening performance of self-compacting concrete is similar to that of ordinary concrete, while the performance of fresh concrete is quite different from that of ordinary concrete. The self-compacting prope...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/24C04B103/30C04B103/22
CPCC04B40/0039C04B2111/00103C04B24/2647C04B2103/20C04B2103/304C04B2103/44C04B24/38C04B24/383
Inventor 白杰王博蔡阳梁锐
Owner CHINA BUILDING MATERIALS ACAD
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