Temperature gradient controlled mass concrete for bridges

Abstract

The invention discloses a temperature gradient controlled mass concrete for bridges. The mass concrete comprises an inner layer of low-temperature rise anti-crack concrete I, a middle layer of low-temperature rise anti-crack concrete II and an outer layer of high-tenacity high-crack resistance concrete from the inside to the outside. According to the mass concrete disclosed by the invention, under combination of the low-temperature rise anti-crack concrete (the inner layer of low-temperature rise anti-crack concrete I and the middle layer of low-temperature rise anti-crack concrete II) and the high-tenacity high-crack resistance concrete structure, hydration heat of cementing materials on various layers is respectively absorbed through the characteristics of a high phase-transition temperature of a composite temperature control material in the inner layer of low-temperature rise anti-crack concrete and a low phase-transition temperature of a composite temperature control material in the middle layer of low-temperature rise anti-crack concrete; the inside and the middle temperatures of the concrete are lowered; meanwhile, different thicknesses and layout forms of two concrete materials are optimized and designed; reduction of the temperature difference between the layers is achieved; the overall temperature stress level is reduced; the technical problem of crack of the mass concrete widely existing in bridge engineering can be effectively solved; and the temperature gradient controlled mass concrete for the bridges is applicable to popularization and application.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a large-volume concrete structure of a bridge controlled by a temperature gradient. Background technique [0002] In recent years, with the rapid development of bridge design and construction technology, bridges that break the world record for long-span bridges continue to appear. With the increase of bridge spans, the quality requirements for large-volume concrete structures such as caps and towers However, due to the large section size of mass concrete, the hydration reaction of cement will generate a lot of heat of hydration during the construction process, and concrete is a poor conductor of heat. Fast, so that a large temperature difference is formed between the inside and the surface of the concrete, resulting in uneven temperature deformation and temperature stress. Once the tensile stress exceeds the instant tensile strength of the concrete, thermal cracks or through cra...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the above-mentioned traditional mass concrete, the present invention proposes a bridge mass concrete with temperature gradient control, which can solve the problems of bridge mass concrete cap cracking and internal and external temperature difference control

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