Super-thick large-volume foundation anti-cracking concrete

Abstract

The invention relates to super-thick large-volume foundation anti-cracking concrete which comprises the following components in proportion by weight: 235-330kg of portland slag cement, 735-791kg of sand, 1,032-1,186kg of graded coarse aggregate stone, 155-210kg of water, 45-90kg of coal ash and 3.76-14.8 kg of compound additive. The invention reduces super-thick large-volume foundation cracks, creates conditions for the construction of a next working procedure, fundamentally solves the problem of cracks of the concrete in the processes of hydrating, hardening and curing, improves the integrity, the stability and the safety of a super-thick large-volume foundation, improves the durability and the anti-cracking function of the concrete and prolongs the service life of equipment foundation engineering.

Description

Technical field [0001] The invention relates to a special concrete, in particular to an anti-cracking concrete used for ultra-thick and large-volume foundations. Background technique [0002] In the construction of metallurgical industry equipment basic engineering, especially blast furnace engineering, as the scale of blast furnace increases, the amount of basic concrete increases correspondingly. During the continuous pouring and hardening of large-volume concrete, the cement hydration reaction generates a large amount of heat of hydration. The thickness of the concrete is ≥5m, the thermal resistance is large, the internal hydration heat is not easy to dissipate, the hydration temperature rises high, and the surface heat dissipation is faster, and the inside and the surface of the concrete form a large temperature difference. The temperature difference between the inside and the surface of the concrete plus the influence of external environmental factors, mold removal and load,...

AI Technical Summary

Problems solved by technology

The occurrence and development of concrete cracks not only affect the appearance of the project, but also accelerate the carbonation of concrete, affect the frost resistance and impermeability of the structure, cause the infiltration of moisture and harmful substances, induce corrosion of steel bars or accelerate the natural aging of concrete, thus damaging the engineering structure The bearing capacity, function and durability of the structure may even become a precursor to structural damage, directly affecting the performance of engineering benefits.