Controlled/slow release polycarboxylate water reducing agent for inhabiting aggregate mud content influence and preparation method thereof

A slow-release polycarboxylate and polycarboxylate-based technology, applied in the field of controlled-release polycarboxylate-based water reducers, can solve the problems of poor dispersion, water-reducing rate and slump retention of polycarboxylate-based water-reducers Difficult to popularize and apply, water reducing rate, slump retention and other problems, to achieve strong surface adsorption, solve the effect of water reducing rate, large specific surface area

Inactive Publication Date: 2010-08-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mud content of fine aggregate and coarse aggregate used in production is generally 5-10% and 1-3% respectively, which is much higher than the national standard for fine aggregate and coarse aggregate mud content of less than 3%. And the range of less than 1% (C30 ~ C55 ready-mixed concrete), resulting in greatly reduced water reducing rate and slump retention of polycarboxylate water reducer, mainly because the interlayer structure of clay can absorb a large amount of polycarboxylate Superplasticizer molecules, while

Method used

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  • Controlled/slow release polycarboxylate water reducing agent for inhabiting aggregate mud content influence and preparation method thereof
  • Controlled/slow release polycarboxylate water reducing agent for inhabiting aggregate mud content influence and preparation method thereof
  • Controlled/slow release polycarboxylate water reducing agent for inhabiting aggregate mud content influence and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, 4500g polycarboxylate water-reducer (water agent, solid content is 20%, produced by a company in Wuhan, Hubei, code-named WH) is mixed with 112.5g sodium gluconate, and the stirring time is 10min; then add 500g with an average particle size of 1340 Objective Clinoptilolite powder was stirred for 20 minutes to prepare a controlled-release polycarboxylate-based water reducer (code named ZP-I) that suppresses the influence of aggregate mud content.

[0018] Table 1 shows the fluidity of cement paste and the test results of fluidity loss over time in this embodiment, and Table 2 shows the test results of concrete slump and slump loss over time.

Embodiment 2

[0020] First, mix 4000g of polycarboxylate water-reducer (water agent, 20% solid content, produced by a company in Nanjing, Jiangsu, code-named NJ) with 100g of sodium gluconate, and stir for 5 minutes; then add 100g of the average particle size of 1340 mesh Mordenite powder, stirred for 10 minutes, the controlled slow-release polycarboxylate water reducer (code named ZP-II) that inhibits the influence of aggregate mud content was prepared.

Embodiment 3

[0022] First, 3553g polycarboxylate water-reducer (water agent, solid content is 20%, produced by a company in Wuhan, Hubei, code-named WH) is mixed with 45g sodium gluconate, and the stirring time is 10min; then add 100g average particle size of 1340 mesh Clinoptilolite powder, stirred for 20 minutes, that is, a controlled and slow-release polycarboxylate water reducer (code named ZP-I) that suppresses the influence of aggregate mud content is prepared.

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Abstract

The invention relates to a controlled/slow release polycarboxylate water reducing agent for inhabiting the aggregate mud content influence, which is characterized in that the controlled/slow release polycarboxylate water reducing agent comprises the following ingredients by weight parts: 75 to 95 parts of polycarboxylate water reducing agents, 2 to 5 parts of retarders and 5 to 25 parts of slow release agents. Because natural zeolite powder has the characteristics of microporous structure, large specific surface area and strong surface absorption capability, the natural zeolite powder can be used as the slow release agents. The invention utilizes the natural zeolite powder as the slow release agents, and the surface of the natural zeolite powder can absorb a large number of polycarboxylate water reducing agents and a small number of retarders after the natural zeolite powder is mixed with the polycarboxylate water reducing agents and the retarder. Clay can preferentially absorb the natural zeolite powder with strong surface absorption capability when the natural zeolite powder is doped into concrete to be stirred with gelled materials, aggregates and water, and the excessive absorption of the polycarboxylate water reducing agent by the clay is avoided, so the absorption of the polycarboxylate water reducing agents on cement grains and the dispersing effect taking are ensured.

Description

technical field [0001] The invention relates to a controlled and slow-release polycarboxylate water reducer, in particular to a controlled and slow release polycarboxylate water reducer that suppresses the influence of aggregate mud content and a preparation method thereof. Background technique [0002] High-performance concrete is generally composed of cementitious materials, aggregates, superplasticizers and water, among which superplasticizers and aggregates are essential raw materials. Polycarboxylate-based water reducer is a new generation of high-efficiency water-reducer developed after naphthalene-based, melamine-based, and sulfamate-based high-efficiency water-reducers. High performance, good slump retention, good compatibility with cement and other characteristics, the application of polycarboxylate superplasticizer in high performance concrete has become the current development trend. [0003] Compared with naphthalene-based, melamine-based, and sulfamate-based su...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B24/04C04B24/10C04B103/22C04B103/30
CPCC04B2103/302C04B20/1022C04B2103/24C04B28/02C04B2103/408
Inventor 王信刚宋固全胡明玉
Owner NANCHANG UNIV
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