Large-volume concrete and preparation method thereof

Abstract

The invention discloses large-volume concrete and a preparation method thereof, and belongs to the field of a building material. The key point of the technical scheme is as follows, the large-volume concrete comprises the following components in parts by weight: 180 to 190 parts of cement, 170 to 180 parts of water, 730 to 740 parts of medium sand, 1010 to 1020 parts of detritus, 70 to 80 parts ofcoal ash, 170 to 180 parts of ore powder, 4 to 5 parts of water reducer and 4 to 6 parts of additive, wherein the water reducer is a polycarboxylic acid water reducer; the additive comprises low-temperature expansible graphite, organic bentonite and carbon fiber; and the weight ratio of the low-temperature expansible graphite to the organic bentonite to the carbon fiber is 3:1:1. Through the low-temperature expansible graphite, the internal temperature of the concrete is reduced and the internal and external temperature difference of the concrete is reduced; furthermore, the expanded graphitecan block crack, so that the water seepage condition is reduced; through cooperative use of the organic bentonite and the low-temperature expansible graphite, the bentonite is expanded when encountering water, so that capillary channels and microcracks can be blocked timely, and salt corrosion can be interdicted and eliminated; and due to addition of the carbon fiber, the strength and the toughness of the concrete can be improved and the mechanical property of the concrete can be improved.

Description

technical field [0001] The invention relates to the field of building materials, more specifically, it relates to a mass concrete and a preparation method thereof. Background technique [0002] The mass concrete whose minimum geometric dimension of the concrete structure is not less than 1m, or the concrete that is expected to cause harmful cracks due to the temperature change and shrinkage caused by the hydration of the cementitious material in the concrete, is called mass concrete; in modern architecture It often involves large-volume concrete construction, such as high-rise building foundations, large-scale equipment foundations, water conservancy dams, etc. Its main feature is its large volume, the minimum size of the general entity is greater than or equal to 1m, its surface coefficient is relatively small, the release of cement hydration heat is relatively concentrated, and the internal temperature rises relatively quickly; when the temperature difference between the i...

AI Technical Summary

Problems solved by technology

However, during the cooling process of concrete, the internal hot concrete restrains the shrinkage of the external cold concrete, that is, there is a temperature gradient in the internal temperature field, which forms temperature stress and causes internal stress. In the constrained part, the shrinkage of concrete will produce a large If the tensile stress of the concrete exceeds the ultimate tensile strength of the concrete, concrete cracks will appear, resulting in a decrease in the physical and mechanical properties of the concrete, and the corrosive medium will easily penetrate into the concrete structure, thereby reducing the life of the concrete.

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