A kind of concrete for long wall engineering and preparation method thereof

Abstract

The invention belongs to the technical field of concrete preparation, and proposes a concrete for long wall engineering and a preparation method thereof, which is characterized in that it is made of the following components in parts by weight: 60-100 parts of low-heat cement, 40-100 parts of washed sand 80 parts, 40-80 parts of machine-made sand, 100-150 parts of coarse aggregate, 6-12 parts of polycarboxylate high-performance water reducer, 2-4 parts of polypropylene fiber, 1-2 parts of carboxymethyl cellulose, and 60-80 parts of slurry, 0.2-0.8 parts of absolute ethanol, 1-1.5 parts of admixture, 50-80 parts of portland cement clinker for low heat cement, 8-12 parts of desulfurized gypsum, 30-40 parts of slag, 20 ‑25 parts of steel slag, 40‑60 parts of fly ash, the particle size of machine-made sand is less than 5mm, the particle size of coarse aggregate is 5‑20mm, and the coarse aggregate is composed of 80‑120 parts of crushed stone and 20‑30 A mixture of pebbles. The invention solves the problem that many cracks are often produced in the concrete used in traditional long wall engineering, and the generation of cracks seriously affects the service strength, service durability and safety of the long wall.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, and relates to a concrete used for long wall engineering and a preparation method thereof. Background technique [0002] Concrete used in traditional long wall engineering often produces many cracks, which seriously affect the strength, durability and safety of the long wall. There are many reasons for concrete cracks. For example, in order to ensure the strength of concrete, the amount of cement in the general proportion is too large. The hydration of cement produces a large amount of hydration heat, which is prone to temperature cracks. Due to internal constraints caused by too long walls, it is easy to occur Shrinkage cracks; inappropriate selection of medium sand fineness leads to difficult control of concrete workability, and wall cracks are more likely to appear; concrete production units cannot restrict the concrete maintenance of construction units, thus increasing the probab...

AI Technical Summary

Problems solved by technology

[0002] Concrete used in traditional long wall engineering often produces many cracks, which seriously affect the strength, durability and safety of long walls.

There are many reasons for concrete cracks. For example, in order to ensure the strength of concrete, the amount of cement in the general proportion is too large. The hydration of cement produces a large amount of hydration heat, which is prone to temperature cracks. Due to internal constraints caused by too long walls, it is easy to occur Shrinkage cracks; inappropriate selection of medium sand fineness leads to difficult control of concrete workability, and wall cracks are more likely to occur; concrete production units cannot restrict the concrete maintenance of construction units, thus increasing the probability of cracks

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