High-fluidity lightweight high-strength concrete and preparation method thereof

Abstract

The invention discloses a high-fluidity lightweight high-strength concrete. The concrete comprises, by weight, 500 to 600 parts of cement, 300 to 400 parts of silica fume, 50 to 100 parts of mineral powder, 50 to 70 parts of glass beads, 50 to 150 parts of fly ash, 10 to 30 parts of light sand, 50 to 100 parts of yellow sand, 1 to 10 parts of a viscosity reducer, 130 to 150 parts of water, 25 to 35 parts of a water reducing agent and 50 to 160 parts of steel fibers. A preparation method is simple, and the prepared concrete has the advantages of low volume weight, high strength, good fluidity and pumpability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a high-fluidity lightweight high-strength concrete and a preparation method thereof. Background technique [0002] High-strength concrete has a large apparent density, generally 2400kg / m 3 , large structural bearing capacity. Lightweight concrete has low compressive strength, generally less than 50MPa, and is generally used for thermal insulation structures, but less for load-bearing structures. In high-rise, super high-rise building structures, long-span bridges, urban overpasses and marine engineering, in order to reduce the structure's own weight and reduce the cost of the project, lightweight high-strength concrete is widely used. The lightweight high-strength concrete prepared by the existing technology has a relatively large apparent density, generally 1800 kg / m 3 , Poor workability, not easy to pump. Therefore, in order to meet the construction a...

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Problems solved by technology

However, the particle size of the coarse aggregate and pottery sand used in this invention is relatively large, the accumulation of aggregate and cementitious material particles is not tight, and the interface transition zone is weak; and the coarse aggregate needs to be pre-wetted for 24 hours in advance and dried naturally to control its moisture content , more complex, difficult to engineering construction; the prepared concrete has a higher apparent density and a lower degree of expansion

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