A kind of ultra-high performance concrete prepared by using wet granite stone powder and its preparation method

Abstract

The invention discloses a super high performance concrete prepared by a wet granite stone powder and prepared from cement, fly ash microbeads, silica fume, the wet granite stone powder, a hydrogen peroxide solution, river sand, steel-imitated fibers, a superdispersion shrinkage-reducing admixture, a defoamer and water as main raw materials. The concrete workability and microstructure of concrete are controlled by the fly ash microbeads; the hydrogen peroxide solution is decomposed to release oxygen to disperse the wet granite stone powder, the wet granite stone powder and cementitious materialparticles are dispersed by dispersing groups of the superdispersion shrinkage-reducing admixture, the hydration rate and the utilization ratio of the cementitious material are effectively improved, and shrinkage of the concrete is reduced; bubbles, introduced by oxygen generated from decomposition of hydrogen peroxide and other materials, in concrete are eliminated by the defoamer, so as to ensure the mechanical properties and durability of the concrete. The UHPC prepared by the wet granite stone powder has the advantages of super high strength, toughness, excellent crack resistance and the like, meets the requirements of environmental protection and energy conservation, and has important application value.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to an ultra-high performance concrete prepared by using wet granite powder and a preparation method thereof. Background technique [0002] Ultra-high performance concrete is widely used in cable trays, sidewalk covers, high-speed railways, subways, and bridges due to its advantages such as ultra-high strength, excellent toughness and durability, almost no penetration, and certain self-repairing functions. But there are also the following defects: 1) The amount of cement used in ultra-high performance concrete is as high as 800-1000kg / m 3 , which increases the heat of hydration and is prone to shrinkage problems; 2) The raw materials required for the preparation of ultra-high performance concrete include cement, silica fume, quartz sand, quartz powder, steel fiber and superplasticizer, etc., and the production cost is that of ordinary concrete Several times; 3) The wate...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the prior art, to provide a high-strength, high-toughness and shrinkage-reducing ultra-high-performance concrete mixed with wet granite powder and its preparation method. The wet granite powder is directly applied to the preparation of concrete, and the obtained concrete has It has the advantages of ultra-high strength, toughness and excellent crack resistance, and can effectively solve the resource waste problem of granite stone powder, which has important economic and environmental benefits

Images