Non-steamed reactive powder concrete

Abstract

The invention belongs to concrete materials and in particular relates to reactive powder concrete which can be maintained at room temperature. The non-steamed reactive powder concrete of the invention is prepared by mixing cement, superfine steel slag powder, natural sand, steel fiber, water reducing agent and water in a mass ratio of 1: 0.10-0.25: 1.25-1.45: 0-0.25: 0.01-0.04: 0.15-0.28. In the invention, natural sand replaces quartz sand, the 200-grade reactive powder concrete is prepared by maintenance at room temperature, so raw material cost and concrete maintenance cost can be obviously reduced; a great amount of industrial residues are used, so the non-steamed reactive powder concrete has the advantages of low cost, sources conservation, waste recycling, environment protection and the like. The maintenance process of the non-steamed reactive powder concrete needs no high temperature or high pressure, so the production and construction processes are simplified. The non-steamed reactive powder concrete is applicable to production of thin-wall products or elongated members and can be used for producing reinforced concrete members such as plates, blocks and the other structure forms, so the market application prospect is promising.

Description

technical field [0001] The invention belongs to the field of building materials and relates to a concrete material, in particular to an active powder concrete which can be cured at normal temperature. Background technique [0002] In the early 1990s, the French Bouygues laboratory developed a new type of cement-based composite material with ultra-high compressive strength, high durability and high toughness. Due to the increase in the fineness and reactivity of the components, it is called active Powder concrete (ReactivePowder Concrete, referred to as RPC). RPC has improved the interior of concrete and the transition zone between coarse aggregate and mortar: (1) choose quartz sand with a maximum particle size of 0.5mm as coarse aggregate to improve the homogeneity of concrete; (2) increase the composition of The fineness makes the interior of RPC achieve the maximum filling density and minimize the initial defects of the material; (3) Apply pressure during the molding proc...

AI Technical Summary

Problems solved by technology

Due to the use of expensive raw material components such as silica fume and quartz sand in the formula, the cost of this type of concrete itself is relatively high. In addition, ordinary RPC generally needs to be molded and maintained under high temperature or pressure, and the maintenance cost is relatively high. , so the actual application of engineering often leads to a significant increase in engineering cost, which seriously hinders the promotion of this type of new material