Ultrafine mixed sand concrete by using additive

Abstract

The invention relates to an ultrafine mixed sand concrete by using an additive, the concrete comprises cement, slag powder, fly ash, mixed sand, broken stone and the additive, the mixed sand comprises ultrafine mixed sand with fineness modulus of 0.8 - 1.2, medium sand with fineness modulus of 2.3 - 3.0, chips with fineness modulus of 2.8 - 3.6, and the stone flour content in chips is 4% - 8%, methylene blue is less than 1.4. According to the invention, the ultrafine mixed sand concrete solves the problems that the concrete prepared by chips is solid but unaesthetic, the ultrafine sand can not be used for the important projects and the slump loss of the ultrafine mixed sand concrete is large.

Description

technical field [0001] The invention relates to building materials, in particular to a superfine mixed sand concrete using admixtures. Background technique [0002] The continuous development of the economy has driven the rapid development of the construction industry, and concrete is one of the most used building materials in modern construction projects, and its demand in various buildings has increased by leaps and bounds. According to preliminary statistics, the total sales of commercial concrete in my country in 2009 reached about 790 million cubic meters. Faced with such a high sales volume of concrete, the supply of various raw materials for concrete is getting tighter and tighter. Sand is one of the most important raw materials for concrete. During the peak period of engineering construction, the demand for construction sand is huge. Due to the excessive exploitation of natural river sand year after year, river sand resources are becoming increasingly depleted,...

AI Technical Summary

Problems solved by technology

my country's ultra-fine sand (silt sand) is widely distributed, with a large output in natural rivers, abundant resources, convenient mining and transportation, and low prices. However, due to the increase in unilateral water consumption and cement consumption, the drying shrinkage of concrete increases. Natural ultra-fine sand that is generally forbidden to be used in construction projects in Shanghai

The low application range of actual debris and the prohibition of ultra-fine sand further intensify the market's exploitation and use of rare resources such as natural medium sand, which damages the environment.

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