Machine-made sand fair-faced concrete using limestone powder and preparation method thereof

Abstract

The invention discloses machine-made sand fair-faced concrete using limestone powder and a preparation method thereof. The concrete comprises the following components in percentage by mass: 12-15% ofcement; 0.7-2.6% of limestone powder; 0-1% of phosphorus slag powder; 33-38% of machine-made sand; 36-40% of broken stone; 0.03-0.04% of an additive; and 6-7% of water. The limestone powder is used for partially replacing cement, the cement consumption of the same-grade machine-made sand fair-faced concrete can be reduced, the risk of concrete cracking is reduced, meanwhile, the concrete cost is reduced, good economic benefits and social benefits are achieved, the inherent advantages of the machine-made sand are brought into full play, and the problem of natural sand resource shortage is effectively relieved.

Description

technical field [0001] The invention relates to the technical field of machine-made sand fair-faced concrete, in particular to a machine-made sand concrete using limestone powder and a preparation method thereof. Background technique [0002] Fair-faced concrete is a kind of concrete that directly utilizes the natural surface after concrete molding as the finishing effect. Fair-faced concrete is poured and formed at one time without any appearance decoration. The surface is flat, smooth, dust-free, no obvious color difference, fine texture, clear edges and corners, and no damage or pollution. [0003] Publication No. CN110482964A discloses "clear-faced concrete and its preparation method", which uses natural sand as fine aggregate to prepare clear-faced concrete with good fluidity and high compactness, but the proportion of cement in this kind of proportioning mode is high , there is a risk of concrete cracking, and the preparation process will consume a lot of natural sand...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a machine-made sand fair-faced concrete using limestone powder and its preparation method, replace natural sand with machine-made sand as fine aggregate, and use limestone powder to replace part of cement at the same time, so as to solve the shortage of natural sand resources In order to solve the apparent quality problems of fair-faced concrete caused by the phenomenon of concrete segregation and bleeding caused by the inherent defects such as the apparent roughness and poor gradation of the machine-made sand

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