Water reducing agent with concrete workability adjusting function and synthetic method thereof

Abstract

The invention discloses a water reducing agent with a concrete workability adjusting function. The water reducing agent is prepared from the following components: a. isopentenol polyoxyethylene ether, b. acrylic acid or methylacrylic acid or a mixture of the acrylic acid and the methylacrylic, c. maleic anhydride, d. sodium p-styrenesulfonate, e. ammonium persulfate or potassium persulfate or a mixture of the ammonium persulfate and the potassium persulfate, and f. sodium methallyl sulfonate, wherein the molar ratio of the using amount of a to b to c to d to f is 1:(1-1.5):(1.5-2.5):(0.2-0.25):(0.3-0.6); the using amount of e is 0.5 to 1.0 percent of the total weight of a, b and c. The water reducing agent provided by the invention has water retention capacity and has the function of reducing the surface tension of concrete so as not to influence the viscosity and the flowability of the concrete, and also can guarantee normal condensation and strength development of the concrete.

Description

technical field [0001] The invention relates to a water reducing agent for construction, in particular to a water reducing agent with the function of adjusting the workability of concrete and a synthesis method thereof. Background technique [0002] In recent years, with the development of large-scale national infrastructure projects such as national railways, ports, and nuclear power plants, and the high-performance requirements of these key projects for concrete, the market for polycarboxylate-based high-performance water-reducing agents has developed rapidly. The continuous progress of polycarboxylate superplasticizer synthesis and application technology. With the supply of upstream raw materials becoming more and more mature, the cost-effectiveness of polycarboxylate superplasticizers has become increasingly prominent compared with other superplasticizers. Its excellent water reducing properties, slump retention and environmental protection are increasingly recognize...

AI Technical Summary

Problems solved by technology

However, in its popularization and application, some shortcomings of polycarboxylate superplasticizer itself have also affected its development to some extent.

The existing problems are as follows: 1. Inadaptability to aggregates with high mud content

2. Sensitivity to dosage and water consumption

3. Concrete apparent bubble problem

4. Problems such as large collapse of concrete after pumping out

However, for most of the water-retaining and viscosity-adjusting agents, such as: cellulose, Wenlun gum, sodium alginate, and xanthan gum, there are a series of problems that are difficult to effectively apply.

Such as: incompatible with polysulfonic acid superplasticizer, there will be precipitation and layering phenomenon; it will increase the viscosity of concrete and affect the fluidity; most of them will affect the setting time of concrete and the strength of concrete; with the increase of concrete viscosity, its Plastic containment also increased