Concrete for long wall engineering and preparation method thereof

Abstract

The invention belongs to the technical field of concrete preparation and brings forward concrete for long wall engineering and a preparation method thereof. The invention is characterized in that theconcrete is prepared from the following ingredients (by weight): 60-100 parts of low-heat cement, 40-80 parts of washed-out sand, 40-80 parts of machine-made sand, 100-150 parts of coarse aggregate, 6-12 parts of a polycarboxylates high performance water-reducing admixture, 2-4 parts of polypropylene fiber, 1-2 parts of carboxymethyl cellulose, 60-80 parts of water for slurry preparation, 0.2-0.8part of anhydrous ethanol, and 1-1.5 parts of an additive. The low-heat cement is prepared by mixing the following ingredients (by weight): 50-80 parts of Portland cement clinker, 8-12 parts of desulfurized gypsum, 30-40 parts of mineral waste residue, 20-25 parts of steel slag and 40-60 parts of fly ash. Particle size of the machine-made sand is less than 5 mm, and particle size of the coarse aggregate is 5-20 mm. The coarse aggregate is prepared by mixing 80-120 parts by weight of broken stone and 20-30 parts by weight of pebble. The problem that traditional concrete for long wall engineering often produce more cracks which will severely affect use strength, use durability and safety of long walls is solved.

Description

technical field [0001] The invention belongs to the technical field of concrete preparation, and relates to a concrete for long wall engineering and a preparation method thereof. Background technique [0002] The concrete used in traditional long wall engineering often produces many cracks, and the occurrence of cracks has a serious impact on 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, and the hydration of cement produces a lot of hydration heat, which is prone to temperature cracks. Shrinkage cracks; inappropriate selection of medium sand fineness makes the workability of concrete difficult to control, and wall cracks are more likely to occur; the concrete production unit cannot constrain the concrete maintenance of the construction unit, thus increasing the probability of cracks. It is of great signifi...

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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