Light high-strength thin-wall cast-in-place concrete

Abstract

The invention relates to light high-strength thin-wall cast-in-place concrete. The concrete is prepared from the following raw materials in parts by weight: 220 to 300 parts of cement, 120 to 150 parts of fly ash, 20 to 30 parts of silica fume, 60 to 80 parts of mineral powder, 820 to 900 parts of gravels, 640 to 800 parts of river sand, 80 to 140 parts of glass fiber reinforced plastic particles,8 to 12 parts of additives, 40 to 80 parts of a shrinkage-reducing anti-cracking material and 130 to 150 parts of water. The concrete has the beneficial effects that the risk that the thin-wall structure with the large ratio of the specific surface area to the volume of the thin-wall structure is prone to cracking can be reduced, and pouring construction of parts with narrow working faces, densereinforcing bars, complex shapes and the like can be completed under the vibration-free or slight vibration condition.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a lightweight, high-strength, thin-walled cast-in-place concrete. Background technique [0002] In modern large-scale bridge projects, tunnel projects and high-rise buildings, due to special space, structure and function requirements, some parts often use thin-walled cast-in-place concrete, which is different from relatively mature and perfect mass concrete, high-strength concrete and super high-rise buildings. Compared with preparation technologies such as pumping concrete, less attention has been paid to thin-wall concrete preparation technology. [0003] During the construction of thin-walled concrete, the general working surface and working space are limited, and it needs to be self-leveling after pumping out. The amount of glue used is large, the heat release of hydration is high, and the surface area and volume of the test piece are relatively large, and the ability to res...

AI Technical Summary

Problems solved by technology

[0005] At present, the effective way to improve the crack resistance of concrete is to delay the early cement hydration through organic hydration inhibitors, or to add expansion components to counteract the shrinkage of concrete, but organic components and expansion agents will affect the strength development, and the cement and other adhesive materials Mass fluctuations limit the effect of organic components and expanders

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