Machine-made sand concrete and its preparation method

Abstract

The invention relates to the technical field of concrete, in particular to a method for preparing manufactured sand concrete. In the method, lightweight aggregate (fine aggregate I, coarse aggregate Iand coarse aggregate II) is prepared through step-by-step heating and cooling, and the lightweight aggregate, stone treated by abrasive, manufactured sand obtained by abrasive treatment and waste concrete and other gel materials are reasonably mixed. On the premise of obtaining the manufactured sand concrete which is good in mobility, appropriate in collapsbillity, good in cohesiveness and water-retaining property and appropriate in compressive strength, the manufactured sand is applied to replace natural sand, the stone treated by the abrasive is used to replace natural cobblestone, and environmental destruction and pollution are effectively reduced. The invention also discloses manufactured sand concrete obtained by using the method for preparing the manufactured sand concrete, the manufactured sand concrete has good building performance and high strength, does not crack easily and can fully meet the construction needs of the construction industry.

Description

technical field [0001] The invention relates to the technical field of concrete. More specifically, the present invention relates to a machine-made sand concrete and a preparation method thereof. Background technique [0002] With the rapid development of economic construction, my country's infrastructure construction is in the ascendant, the consumption of building materials is huge, natural sand resources are becoming increasingly exhausted, and the excessive exploitation of natural sand has also caused great pressure on the environment and ecology. At the same time, the number of infrastructure construction projects in our country is increasing day by day, which makes machine-made sand emerge as the times require. It has become a trend that machine-made sand replaces natural sand as construction sand. Machine-made sand is artificially crushed, and some fine stone powder and mud powder with a particle size of ≤0.75 μm will inevitably be introduced during the production pr...

AI Technical Summary

Problems solved by technology

Machine-made sand is artificially crushed, and some fine stone powder and mud powder with a particle size of ≤0.75 μm will inevitably be introduced during the production process. The performance and homogeneity are poor, the concrete is prone to bottoming and bleeding, and the shrinkage of the concrete is significantly increased, and it is easy to crack in the early stage. For this, the national standard "Technical Code for Construction of Highway Bridges and Culverts" JTG TF50-2011 has a medium-use mechanism for machine-made sand concrete. The stone powder content in the sand is limited

However, taking measures to wash machine-made sand to remove fine powder will seriously pollute the environment and increase the raw material cost and engineering cost of machine-made sand concrete

[0003] In addition, during the use of existing concrete or machine-made sand concrete, shrinkage and creep will generally occur, that is, during the evaporation of water in the concrete or the absorption of stones, there will be alternating deformation of shrinkage and expansion, resulting in cracking of the structure and affecting the structure. The integrity of the force, reducing its strength

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