Economic active powder concrete mixed superfine cement

Abstract

The invention relates to economic active powder concrete mixed superfine cement and belongs to the technical field of concrete. The economic active powder concrete comprises the following raw material ingredients including concrete, blending materials, sand, water and water reducing agents, wherein the proportioning rate of the total weight of the concrete and the blending materials, the sand, the water and the water reducing agents is 1:(0.7-1.5):(0.14-0.2):(0.01-0.05) through being calculated by weight, the concrete is formed by blending normal concrete and superfine cement, the superfine cement is prepared by using normal cement or cement clinker as raw materials through being ground to the specified fineness, the specific surface area of the superfine cement is not lower than 500m<2> / kg, the specific surface area of the normal cement is smaller than 500m<2> / kg, and the mass content of the normal cement in the cement is not greater than 95 percent. The economic active powder concrete mixed superfine cement has the advantages that the intensity increment speed of the active powder concrete can be accelerated, and the active powder concrete can get rid of the dependence on silica powder.

Description

technical field [0001] The invention relates to a novel active powder concrete, in particular to an economical active powder concrete mixed with superfine cement, which belongs to the technical field of concrete. technical background [0002] In 1993, Richard et al. from Bouygues, France developed an ultra-high-performance cement-based composite material - Reactive Powder Concrete (Reactive Powder Concrete) based on ultra-fine-grained dense cement (DSP) and macro-defective cement (MDF). Powder Concrete, referred to as RPC), now Europe is usually called Ultra High Performance Concrete (Ultra High Performance Concrete, referred to as UHPC). The material is composed of active powder, cement, fine aggregate, high-strength fiber and other components, optimized through gradation design, and prepared through specific processes such as high temperature curing. It is a high-tech composite material. [0003] The basic preparation principles of reactive powder concrete include: no coa...

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Problems solved by technology

[0005] However, there are also some problems in reactive powder concrete: the preparation of reactive powder concrete requires a large amount of silica fume, but my country's silica fume resources are scarce, and the production of silica fume is limited, which makes it difficult to meet the needs of concrete engineering; silica fume participates in secondary water chemical reaction, therefore, the strength of reactive powder concrete increases slowly, which is particularly prominent in the case of normal temperature curing

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