Cement concrete water reducing agent suitable for machine-made sand

Abstract

Belonging to the technical field of environmental protection building materials, the invention in particular relates to a cement concrete water reducing agent suitable for machine-made sand. According to a technical scheme, the cement concrete water reducing agent suitable for machine-made sand is composed of the following components by weight: 8-60 parts of carboxylated styrene butadiene rubber powder, 5-20 parts of potassium aliphatate soap, 10-30 parts of starch, and 10-40 parts of a sodium hydroxide solution. The water reducing agent provided by the invention has very good volume compatibility with machine-made sand, can effectively ensure dispersion of the water reducing agent in concrete, has high water reducing rate and good fluidity, and can obviously improve the fluidity and workability of cement concrete for machine-made sand.

Description

technical field [0001] The invention belongs to the technical field of environmental protection building materials, and in particular relates to a cement concrete water reducer suitable for machine-made sand. technical background [0002] In recent years, high-performance concrete has played an important role in my country's engineering construction. With the rapid development of infrastructure, there has been a shortage of natural sand in many areas, and the supply of high-quality natural sand in the country has gradually decreased. Sand in major cities across the country The contradiction between supply and demand of stone is particularly prominent. Due to the shortage of natural sand resources, machine-made sand is generally used in construction engineering concrete to gradually replace natural sand or mixed sand. However, there are significant differences between machine-made sand and natural sand in terms of grain shape, gradation, surface texture, and stone powder conte...

AI Technical Summary

Problems solved by technology

Due to the shortage of natural sand resources, machine-made sand is generally used in construction engineering concrete to gradually replace natural sand or mixed sand. However, there are significant differences between machine-made sand and natural sand in terms of grain shape, gradation, surface texture, and stone powder content below 0.075 mm.

The rough surface characteristics of machine-made sand particles make the flow resistance of freshly mixed concrete large. To achieve the same fluidity, a large water-cement ratio is required, and the existence of fine stone powder will also absorb more water, which will eventually lead to an increase in the water consumption of machine-made sand concrete. Big

Therefore, the application of machine-made sand in concrete is strictly limited due to the fact that the particle shape, gradation, surface texture and the presence of stone powder have a great influence on the fluidity of concrete.

Due to the differences in the shape, gradation, surface texture and stone powder of the machine-made sand, the volume compatibility between concrete and the current commercially available water-reducing agents will inevitably occur, resulting in a decrease in the water-reducing rate of the water-reducing agent and shortening the service life of cement concrete. and reduced durability