Concrete

Abstract

The invention discloses concrete which consists of the following raw materials mixed together in parts by mass: 250-325 parts of cement, 105-153 parts of coal ash, 0-75 parts of powdered rock phosphate, 880-1000 parts of machine-made sand, 930-990 parts of macadam, 150-160 parts of water and 7-11 parts of a water reducing agent. The concrete has the advantages that at places in shortage of river sand, the machine-made sand can be adopted to replace the river sand, the advantage that the particle size of the machine-made sand and the macadam can be adjusted is sufficiently taken, the problems that newly mixed concrete is poor in cohesiveness and water retaining property, easy to isolate, easy in water secretion, low in combination and relatively poor in flowability can be solved, the compactness, the permeation resistance and the durability of the concrete can be improved, and the environmental protection pressure can be alleviated while good economic benefits are made.

Description

technical field [0001] The invention relates to concrete, in particular to concrete produced by using machine-made sand, fly ash and phosphate rock powder. Background technique [0002] In the United States, Britain, Japan and other industrially developed countries, artificial sand (machine-made sand) has been used as concrete fine aggregate for more than 30 years. It is widely used in various construction projects. The materials, tests and use standards of machine-made sand are quite Complete. The use of machine-made sand in construction in my country has started since the 1960s, but the use of natural sand such as river sand and river sand is still relatively common. In 1973, the National Construction Committee held a demonstration meeting on the application of machine-made sand in concrete in Guizhou Province. Through the exchange of experience in the building materials industry and the construction industry, the research results were affirmed, and the "Technical Regulati...

AI Technical Summary

Problems solved by technology

In places where there is a shortage of river sand, machine-made sand is used instead to give full play to the advantages of machine-made sand and crushed stone with adjustable particle size, which solves the problem of poor cohesion and water retention of freshly mixed concrete caused by poor gradation between stones and sand, and easy segregation. Bleeding, combined with low workability and poor fluidity, is beneficial to improve concrete compactness, impermeability and durability

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