Large-aggregate mixed steel fiber second-level matched concrete and preparation method

Abstract

The invention discloses large-aggregate mixed steel fiber second-level matched concrete and a preparation method. The concrete comprises a cementing material, steel fibers, coarse aggregate, fine aggregate and water, the steel fibers are different in length, and second-level matched coarse aggregate are adopted as the coarse aggregate; the preparation method comprises the following steps that 1, cement, steel fibers, coarse aggregate, fine aggregate and water are obtained according to a proportion, the steel fibers with the length of 60 mm are placed in the weighed water, dispersed and taken out; 3, the weighed coarse aggregate, fine aggregate and cement are stirred for 1 minute, two kinds of steel fibers different in length are added to the mixture during stirring, the weighed water is added to the mixture after even stirring, stirring continues for 1 minute, and the large-aggregate mixed steel fiber second-level matched concrete is obtained. The preparation method is simple, and theprepared second-level matched concrete has high strength and toughness.

Description

technical field [0001] The invention relates to the technical field of concrete in water conservancy projects, in particular to a large-aggregate-mixed-steel-fiber secondary mix concrete and a preparation method thereof. Background technique [0002] The water flow in hydraulic engineering is extremely complex and changeable, and some parts of hydraulic structures are continuously subjected to high-speed turbulent flow. The interior of these high-speed turbulent flow is composed of countless moving eddies of different sizes. In addition to moving in a certain direction with the general trend of the water flow, the vortex also rotates and oscillates, and each particle of the water flow also moves, rotates, and oscillates with the vortex. At the same time, the strong turbulence of the water flow particles produces the pulsation of the flow velocity and the hydrodynamic pressure. This makes high-speed turbulent flow have strong impact, scour, wear, anti-seepage and other probl...

AI Technical Summary

Problems solved by technology

However, at present, the research on steel fiber reinforced concrete mainly focuses on crushed stone concrete with the maximum particle size of the coarse aggregate not greater than 25mm. In projects that require greater strength, the strength of concrete prepared with aggregates of this size is relatively low. The strength of the project cannot be guaranteed. In order to obtain higher strength concrete, aggregates with larger particle sizes are selected, such as secondary aggregates, tertiary aggregates or even quaternary aggregates; but when the particle size of the aggregate exceeds After 40 mm, due to the decrease of the specific surface area of ​​the aggregate, the unevenness of the components in the concrete increases, and the prepared concrete also has poor workability, which is prone to segregation, and at the same time reduces the strength of the concrete