Low-cost alternative resource high-crack-resistance concrete and preparation method thereof

Abstract

The invention belongs to the technical field of concrete, and discloses a low-cost alternative resource high-crack-resistance concrete and a preparation method thereof. In parts by weight, the components and the dosages of the high-crack-resistance concrete are 280 to 450 parts of cement, 20 to 60 parts of fly ash, 50 to 80 parts of slag powder, 10 to 30 parts of calcium mineral admixture, 0 to 200 parts of natural sand, 300 to 500 parts of machine-made sand, 200 to 400 parts of tailing sand, 800 to 1200 parts of stone, 4 to 8 parts of compound chemical additive and 90 to 270 parts of water. The invention solves the problem that natural river sand resource is scarce and the problem that pollution and energy consumption are high in the process of cement production, and greatly reduces the cost of concrete per cubic meter; since machine-made sand, tailing sand and calcium mineral admixture are adopted, the interfacial bond strength of the concrete can be improved, and the crack resistance of the concrete can be improved; and the problems of poor cohesiveness and easy bleeding and segregation existing in concrete are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a low-cost alternative resource high-crack-resistant concrete and a preparation method thereof. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] With the gradual increase in the demand for national infrastructure and the continuous development of concrete technology, the amount of concrete is also gradually increasing, and high-quality concrete raw materials are becoming more and more scarce, especially natural river sand resources. River sand makes the cost and difficulty of preparing high-quality concrete gradually increase. On the other hand, in the process of preparing concrete, cement is a high-pollution, high-energy-consumption and high-cost component. How to reduce carbon and environmental protection, save energy and reduce emissions, and reduce the cost of single-square concrete to a c...

AI Technical Summary

Problems solved by technology

[0006] (1) In the prior art, natural river sand resources are scarce, high pollution, high energy consumption and high concrete cost in the process of cement production;

[0007] (2) In the prior art, machine-made sand and tailings sand contain a certain amount of stone powder, which affects the working performance and volume stability of concrete, and fresh concrete is easy to segregate and bleed, and hardened concrete is easy to crack;

[0008] (3) In the prior art, there are no examples of concrete prepared together with machine-made sand, tailings sand and calcareous mineral admixtures.

On the other hand, the activity of calcareous mineral admixture itself is relatively poor. In the case of partially replacing cement, it is also difficult to solve various performance indicators of hardened concrete through compound chemical admixtures.

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