Concrete

Abstract

The invention discloses concrete, which is prepared from the following ingredients in parts by weight: 150 to 180 parts of cement, 30 to 40 parts of copper slag, 30 to 40 parts of coal gangue, 230 to 265 parts of gravel, 280 to 320 parts of machine-made sand, 20 to 25 parts of early strength agents, 10 to 15 parts of synergists and 70 to 85 parts of water. Wherein the early strength agent comprises the following components in parts by weight: 20-30 parts of calcium chloride, 10-15 parts of calcium nitrite, 8-10 parts of calcium nitrate, 5-8 parts of triethanolamine, 3-5 parts of hydroxymethyl cellulose, 5-6 parts of a polycarboxylate superplasticizer, 5-8 parts of nano silicon dioxide, 5-6 parts of diatomite and 3-5 parts of methacrylic acid. According to the concrete provided by the invention, the hardening time of the concrete can be shortened, and the strength and durability of the concrete can be enhanced.

Description

a concrete technical field The present invention relates to building material technical field, be specifically related to a kind of concrete. Background technique [0002] With the development of urban infrastructure construction, the construction of engineering projects such as prefabricated houses and urban subway tunnels is booming. The rapid development of such projects has higher requirements on the strength of prefabricated concrete components. Therefore, how to improve concrete The early strength of prefabricated elements is the key to the technology. Along with the increasingly exhausted and restricted exploitation of natural sand resources, the substitution effect of machine-made sand is more and more important. Compared with natural sand, it has obvious economic advantages. Although the machine-made sand in various places is slightly different, it is generally more convenient than natural sand. should. Compared with natural sand, machine-made sand has a h...

AI Technical Summary

Problems solved by technology

However, compared with natural sand, machine-made sand has certain shortcomings in fineness modulus, grain shape, gradation, and angularity. Compared with natural sand, machine-made sand has a larger fineness modulus, poorer gradation, rough grain surface, Strong edges and corners, freshly mixed machine-made sand concrete has disadvantages such as poor workability, easy segregation and bleeding of the mixture, excessive slump loss, difficulty in construction pumping, and slow strength growth of machine-made sand concrete in the later stage.