C45 mass concrete and preparation process thereof

Abstract

The invention relates to C45 mass concrete and a preparation process thereof, wherein the C45 mass concrete comprises: 140-170 parts of water, 250-300 parts of cement, 700-750 parts of sand, 335-380 parts of pebble, 700-800 parts of crushed stones, 80-100 parts of fly ash, 70-90 parts of mineral powder, 8-10 parts of a pumping agent, 35-45 parts of an anti-cracking agent, and 1-1.5 parts of a modifier. The preparation method comprises: 1, uniformly stirring sand, pebble, crushed stone and water to obtain an intermediate product; and 2, adding cement, fly ash, mineral powder, a pumping agent, an anti-cracking agent and a modifier, and uniformly stirring to obtain concrete. According to the technical scheme of the present invention, by simultaneously adding fly ash and mineral powder, the consumption of cement is reduced, such that the release rate of hydration heat is delayed, and the occurrence of shrinkage is reduced; and by adding the paraffin microcapsules, the temperature regulation effect can be achieved, such that the influence of the paraffin phase change volatilization on the environment can be avoided.

Description

technical field [0001] The invention relates to the technical field of concrete preparation, in particular to a C45 large-volume concrete and a preparation process thereof. Background technique [0002] At present, the construction technology of mass concrete, especially the mix design of mass concrete, is quite mature. The main technology is: basically adopt the mode of low cement consumption and low heat of hydration cement to reduce the temperature difference between the inside and outside of mass concrete. These are very effective for low-strength concrete (such as concrete with a strength grade of C20) or when the concrete age is required to be 45 days, 60 days or 90 days, and other conventional anti-cracking measures for mass concrete construction are very effective. The idea of ​​mass concrete mix design is "low heat of hydration - low internal stress - low early strength". That is to say, less low heat of hydration concrete is used as the binder of mass concrete, so...

AI Technical Summary

Problems solved by technology

[0003] For mass concrete with high strength requirements (such as C40 / C50 and higher strength mass concrete) and tight construction period, it is difficult to ensure that the concrete does not crack by using the existing mass concrete mix ratio design technology

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