Cement concrete water reducer

Abstract

The invention relates to a cement concrete water reducer and belongs to the technical field of building materials. The cement concrete water reducer comprises, by weight, 20-55% of dispersible glue powder, 10-30% of potassium aliphatate soup, 10-20% of melamine-formaldehyde resin and 10-30% of a sodium silicate solution. The dispersible glue powder has good sphericity and can be uniformly dispersed in a water solution. Under alkaline conditions, potassium aliphatate soup as an interface modifier can change dispersible glue powder surface performances so that the glue powder surface adsorbs water molecules so that a water film with good lubrication effects is formed. The water film has good lubrication effects. The melamine-formaldehyde resin has good hydrophilicity and can reduce cement agglomeration in water so that water reduction is promoted.

Description

technical field [0001] The invention relates to a cement concrete water reducer, which belongs to the technical field of building materials. technical background [0002] In recent years, concrete has played an important role in engineering construction in our country. Since water reducing agents can effectively improve the performance of concrete and have good economic benefits, they have been widely used in many countries. The application of high-efficiency water reducing agents in engineering has attracted more and more attention and has become an indispensable material in concrete. . The water reducing agent has gone through the development process from lignin sulfonate, naphthalene sulfonate condensate (Nether-based superplasticizer), aliphatic and polycarboxylic acid series, etc. Lignosulfonate is the most commonly used common water-reducing agent. However, it is easy to cause retardation during the re-stirring process of the superplasticizer, and often introduces a ...

AI Technical Summary

Problems solved by technology

The water reducing agent has gone through the development process from lignin sulfonate, naphthalene sulfonate condensate (Nether-based superplasticizer), aliphatic and polycarboxylic acid series, etc. Lignosulfonate is the most commonly used common water-reducing agent. However, it is easy to cause retardation during the re-stirring process of the superplasticizer, and often introduces a large amount of air to affect the performance of the concrete; the unavoidable high sodium sulfate content of the Nai series superplasticizer during the mixing process leads to admixture As the content of medium-alkali increases, the durability of concrete decreases, and the phenomenon of alkali-aggregate reaction occurs in many projects, and the service life is greatly shortened

In addition, aromatic sulfonates are potentially toxic to humans and organisms

The ratio of formaldehyde, acetone and other monomers used in the production of aliphatic water reducers is difficult to control, resulting in poor performance of the water reducer and compatibility problems with the cement matrix

The cost of existing polycarboxylate water reducers is high, and there are differences in the degree of polymerization during the synthesis process, resulting in differences in performance; in addition, the contradiction between the supply and demand of sand and gravel in my country is prominent, and natural sand is gradually being replaced by machine-made sand. Compared with natural sand, the composition, surface texture and 0.075mm stone powder particles are quite different, which will lead to the failure of water reducing agent or the decrease of water reducing efficiency, which will have a significant impact on the performance of concrete