Concrete with ultra-large volume, high strength and low hydration heat

Abstract

The invention relates to concrete with ultra-large volume, high strength and low hydration heat. The concrete comprises the following components in parts by weight (cube dosage kg / m3): 200-260 parts of cement, 100-160 parts of mineral powder, 80-100 parts of fly ash, 740-800 parts of fine aggregate, 1010-1050 parts of coarse aggregate, 4.0-5.0 parts of additive and 155-165 parts of water. The concrete with ultra-large volume, high strength and low hydration heat can be used to effectively reduce the hydration heat, greatly reduce the cracking risk of the large-volume concrete from the source and increase the engineering quality.

Description

technical field [0001] The invention relates to building materials, in particular to a super-large-volume, high-strength, low-heat-of-hydration concrete. Background technique [0002] Mass concrete was first used in hydraulic engineering, and it is widely used. In recent years, with the development of social economy and construction technology, the scale of buildings has continued to expand, and there are more and more high-rise buildings and super high-rise buildings. Mass concrete has gradually become an important part of building large facilities or super high-rise buildings. When mass concrete is widely used in high-rise and super high-rise buildings, long-span bridge structures and industrial buildings in the field of civil engineering, cracking occurs in many projects. The causes of mass concrete cracking can be divided into two categories: one is structural cracks, which are caused by external loads, including stress cracks caused by the main stress in conventional s...

AI Technical Summary

Problems solved by technology

However, during the cooling process of concrete, the internal hot concrete restricts the shrinkage of the external cold concrete, that is, there is a temperature gradient in the internal temperature field, which forms a temperature stress and causes internal stress. In the constrained part, the shrinkage of the concrete will generate a large tensile stress ( Because the elastic modulus of concrete increases with age), if the ultimate tensile strength of concrete is exceeded, concrete cracks will appear, resulting in a decrease in the physical and mechanical properties of concrete, and the erosive medium is easy to penetrate into the concrete structure. reduce concrete life

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