Construction process of steel fiber shotcrete

Abstract

The invention relates to the technical field of geotechnical engineering, particularly to a construction process of steel fiber shotcrete. The process is characterized in that cement of the shotcrete construction material selects portland cement, the cement grade is 32.5#, the water cement ratio is 0.40-0.60, the sand selects medium coarse river sand, the fineness modulus is 2.5-3.3, the stone selects grain composition, the maximum particle size does not exceed 10 mm, the sand ratio is 50-100%, the steel fiber has an elasticity modulus of 200 GPa, a tensile strength of 380-1300 MPa, an ultimate elongation of 3-30%, a length of 20-35 mm and a volume ratio of 0.5-2.0%, the steel fiber content is 2.5-4.0%, the water-reducing agent content is 0.02-0.05%, and an additive and an admixture select active fly ash, grinded fine slag and silica fume. According to the present invention, the construction process is improved, and the construction quality of the steel fiber concrete is increased.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a construction technique of steel fiber sprayed concrete. Background technique [0002] Since the development of steel fiber sprayed concrete construction technology, the construction technology is mainly dry spraying method and wet spraying method, and the appropriate construction technology is usually selected according to different construction conditions. The wet spray method is easy to control the water-cement ratio, has low rebound rate and less dust, but the construction distance is short; the dry spray method is easy to operate and has a long construction distance, but the water-cement ratio is not easy to control, the rebound rate is high, and there is much dust. Steel fiber shotcrete is a kind of concrete with discontinuous steel fibers distributed on the sprayed surface formed by spraying at high speed under air pressure. It has good properties of stee...

AI Technical Summary

Problems solved by technology

The water-cement ratio is easy to control, the rebound rate is low, and the dust is less during wet spraying construction, but the construction distance is short; the dry spraying method is easy to operate and the construction distance is long, but the water-cement ratio is not easy to control, the rebound rate is high, and there is more dust