Composite polycarboxylic acid water reducing agent

Abstract

The invention belongs to the technical field of concrete additives, in particular relates to a water reducing agent, and more particularly a composite polycarboxylic acid water reducing agent. The composite polycarboxylic acid water reducing agent is characterized by being prepared from the following components in percentage by mass: 8-28.6 percent of polycarboxylic acid high-performance water reducing agent, 0.5-7.36 percent of inhibiting agent, 0.001-0.15 percent of functional aid, 0.01-0.65 percent of preservative and the balance of water, wherein the total mass percentage of the components is 100 percent. The composite polycarboxylic acid water reducing agent is applied to freshly mixed concrete. After a template coated with waste engine oil or rosinate soap is dismantled, the surface of hardened concrete is smooth, air bubbles are reduced remarkably, and the construction requirement is fully met. By adopting the composite polycarboxylic acid water reducing agent, the problem of a large quantity of air bubbles on the surface of concrete, produced after the use of demolding agents such as waste engine oil or rosinate soap and the like is solved.

Description

technical field [0001] The invention belongs to the technical field of concrete additives, and in particular relates to a water reducer. Background technique [0002] With the construction of large-scale infrastructure in my country, as well as the increasing number of high-speed railways and high-rise and super high-rise buildings, the requirements for concrete water reducing agents are also getting higher and higher, especially some super large projects have higher requirements for appearance , and polycarboxylate superplasticizers are widely used due to their incomparable advantages over traditional superplasticizers. Polycarboxylate superplasticizer has more active groups, large degree of freedom in molecular structure, high water reducing rate and relatively better compatibility with different cements. Even at low dosage, polycarboxylate water reducing The agent can make the concrete have high fluidity, and has low viscosity and slump retention performance at low water-...

AI Technical Summary

Problems solved by technology

Since the polycarboxylate high-performance water reducer is a high-molecular substance, it contains some unreacted active small molecules, while waste engine oil and release agent contain many organic substances, which are easily mixed with the polycarboxylate water reducer. The active small molecules react chemically to form new substances that bond on the surface between the formwork and the concrete. After the concrete mixed with polycarboxylate high-performance water reducer is hardened and the formwork is removed, on the one hand, there are many dense and small air bubbles on the surface of the concrete. On the other hand, the concrete surface is rough due to bonding during formwork removal, which seriously affects the appearance and greatly limits the popularization and application of polycarboxylate superplasticizers.

[0004] Since the application of polycarboxylic acid at home and abroad is not very long, especially in the season with high temperature, the air bubbles on the surface of concrete are more obvious, and there have been no relevant patents and literatures that have a good solution to this.

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