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Polycarboxylic acid type special additive for lightweight aggregate concrete

A lightweight aggregate concrete and polycarboxylic acid-based technology, which is used in the field of special admixtures for concrete and polycarboxylic acid-based admixtures for lightweight aggregate concrete, can solve the problem that the homogeneity and plastic preservation properties of concrete are not significantly improved, It is difficult to accurately control the degree of pre-wetting of lightweight aggregate, and the effect of lightweight aggregate concrete is not good, which can achieve obvious economic and social benefits, improve construction work efficiency, and increase slump loss.

Pending Publication Date: 2010-11-24
GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, people mainly use pre-wetting of lightweight aggregates to reduce the absorption of mixing water by lightweight aggregates during construction, thereby improving its workability, but this method does not significantly improve the homogeneity and plasticity of concrete.
And in the actual construction process, it is found that the pre-wetting degree of lightweight aggregate is difficult to control accurately, which leads to fluctuations in concrete strength
The existing ordinary admixtures are mainly developed for ordinary concrete, and the effect of applying them to lightweight aggregate concrete is not good

Method used

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  • Polycarboxylic acid type special additive for lightweight aggregate concrete
  • Polycarboxylic acid type special additive for lightweight aggregate concrete
  • Polycarboxylic acid type special additive for lightweight aggregate concrete

Examples

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Embodiment 1

[0053] A special polycarboxylate admixture for lightweight aggregate concrete, consisting of 400g of polycarboxylate water reducer, 30g of commercially available industrial grade sodium gluconate, 1g of tripartite saponin, 1g of defoaming component BYK-024, hydroxypropyl Prepared by adding 0.05 g of methyl cellulose ether into 568 g of water and stirring for about 90 seconds. The polycarboxylic acid-based water reducer is a polymethacrylic acid copolymer whose side chain is polyoxyethylene, and the water reducing rate is above 20%; the viscosity of the hydroxypropyl methyl cellulose ether is 12000-18000mP· s; the defoaming component BYK-024 is polysiloxane and its composite product with a specific surface area lower than 16-21Mn / m.

[0054] When using, first weigh 1% of the amount of concrete cementitious material, first mix the sand, gravel, cement, and mineral admixtures in the concrete for 1 minute, then add water and admixture while stirring, and stir for more than 2 minut...

example 2

[0063] A special admixture for lightweight aggregate concrete polycarboxylate, consisting of 800g of polycarboxylate water reducer, 40g of commercially available industrial grade sodium gluconate, 2g of tripartite saponin, 1.5g of defoaming component BYK-024, and Prepared by adding 0.1 g of hydroxyethyl cellulose ether into 1157 g of water and stirring for about 90 seconds. The polycarboxylate water reducer is a polyether copolymer whose side chain is polyoxyethylene, and the water reducing rate is above 20%; the viscosity of methyl hydroxyethyl cellulose ether is 12000-18000mP·S; the said The defoaming component BYK-024 is polysiloxane and its compound product with a specific surface area lower than 16-21Mn / m.

[0064] When using, first do a test on the optimum dosage of the admixture to determine the appropriate dosage of the admixture. First mix the sand, gravel, cement, and mineral admixtures in the concrete for 1 minute, then add water and admixtures while stirring, and ...

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Abstract

The invention relates to a polycarboxylic acid type special additive for lightweight aggregate concrete, which is formed by uniformly mixing 40-50 parts by weight of polycarboxylic acid type water reducing agent, 0.5-6 parts by weight of sodium gluconate, 0.1-0.4 part by weight of triterpenoids saponin, 0.05-0.2 part by weight of defoamer BYK-024 and 0.005-0.02 part by weight of cellulose ether with 50-60 parts by weight of water. The adoption of the special additive can lead lightweight aggregate to be difficult to float, avoid causing great impacts on the working performance of concrete, further avoid increasing the loss of slump constant, well control the performances of workability and homogeneity of the concrete, simplify the production process of the lightweight aggregate concrete, improve the production efficiency, simultaneously improve the construction working efficiency and obtain obvious economic benefits and social benefits.

Description

technical field [0001] The invention relates to a special admixture for concrete, in particular to a special admixture suitable for polycarboxylic acid series used in lightweight aggregate concrete, and belongs to the technical field of building materials. Background technique [0002] With the rapid development of my country's construction industry and the acceleration of infrastructure construction, lightweight aggregate concrete is widely used in various projects due to its light weight, high strength, heat preservation, heat insulation, earthquake resistance, wear resistance and other functional characteristics. [0003] Lightweight aggregate concrete is concrete made from lightweight aggregates. Lightweight aggregates are divided into lightweight coarse aggregates and lightweight fine aggregates. Lightweight coarse aggregate mainly includes natural lightweight aggregate (such as pumice, tuff, perlite, etc.), artificial lightweight aggregate (such as shale ceramsite, cl...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/10
CPCC04B28/02C04B2111/40C04B24/2641C04B2103/302C04B40/0039C04B24/04C04B24/10C04B24/383C04B2103/50C04B24/2647
Inventor 钱亮钟建锋陈晓芳田晓霞李红辉
Owner GUANGDONG PROVINCIAL CHANGDA HIGHWAY ENG
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