Reduced slushing agent for building concrete

Abstract

The invention discloses a reduced slushing agent for building concrete, which is a high-efficiency polycarboxylate slushing agent. The reduced slushing agent for building concrete is prepared through adding maleic anhydride, diethylene glycol monobutyl ether, tertiary butanol and a catalyst into water firstly; then, heating the obtained mixture to 120 DEG C, carrying out heat preservation 4 hours, and cooling the obtained mixture to 80 DEG C; adding an initiator, a methacrylic acid and isoamyl alcohol polyoxyethylene ethers into the obtained mixture; continuing to carry out heat preservation 2 hours, and cooling the obtained solution to 35 DEG C; and neutralizing the obtained solution by using a neutralizing agent until the PH value of the obtained solution is 7-8. Through the way, the reduced slushing agent for building concrete disclosed by the invention can effectively improve the water reducing rate and dispersity of the slushing agent, and increase the strength of concrete, so that the concrete is excellent in slump retaining property, fluidity and crack resistance; and the slushing agent has a good compatibility with concrete.

Description

technical field [0001] The invention relates to the technical field of architectural decoration, in particular to a shrinkage-reducing water reducer for architectural concrete. Background technique [0002] Cracking caused by shrinkage of concrete will greatly reduce the strength and durability of concrete, thereby shortening the service life of concrete. Concrete water reducer is one of the technical ways to reduce the amount of cement, improve the utilization rate of industrial waste residue, and realize the durability and high performance of concrete. It is also one of the key materials to make concrete develop into a high-tech field. [0003] At present, my country's concrete water reducers mainly include high-efficiency water reducers such as naphthalene, sulfamate, and melamine. The most commonly used is lignosulfonate superplasticizer, which is cheap, but its water reducing rate is low, only 8%-10%, and it has a certain retarding and air-entraining effect. Overdosing...

AI Technical Summary

Problems solved by technology

The most commonly used is lignosulfonate superplasticizer, which is cheap, but its water reducing rate is low, only 8%-10%, and it has a certain retarding and air-entraining effect. Overdosing seriously affects the performance of concrete; naphthalene series And melamine high-efficiency water-reducing agent, its water-reducing rate is generally about 20%, does not entrain air, does not retard setting, and has a good reinforcing effect. Over-mixing has little effect on concrete performance, but its raw material prices are high, and adding this type of water-reducing agent The concrete slump loss of the water agent is large, and the raw materials such as naphthalene, formaldehyde, and melamine are harmful to the human body and the environment.

Although these water reducers can reduce the shrinkage of concrete to a certain extent, they still cannot meet the needs of the project.