Economic active powder concrete mixed superfine cement

A technology of ultra-fine cement and active powder, applied in the field of concrete, can solve the problems of slow increase in the strength of active powder concrete, limited silica fume output, and lack of silica fume resources.

Inactive Publication Date: 2012-11-14
BEIJING UNIV OF TECH
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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 mak

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  • Economic active powder concrete mixed superfine cement

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Embodiment

[0021] The typical material mix ratio that the present invention adopts, and the fluidity and strength of corresponding active powder concrete are shown in the following table:

[0022]

[0023] The slag powder in the above table is the abbreviation of granulated blast furnace slag powder;

[0024] The ultra-fine cement is an expansive ultra-fine portland cement with a specific surface area of ​​647m 2 / kg;

[0025] Described ordinary cement is 42.5 grades of early-strength ordinary Portland cement;

[0026] The grade of the granulated blast furnace slag powder is S95, and the density is 2.86g / cm 3 , specific surface area 408m 2 / kg;

[0027] Described fly ash is Class I fly ash, density 2.23g / cm 3 , specific surface area 278m 2 / kg;

[0028] The sand is natural quartz sand with a particle size ranging from 40 mesh to 70 mesh;

[0029] The water described complies with the provisions of JGJ 63-89 in the "Concrete Mixing Water Standard";

[0030] Described water red...

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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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Application Information

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IPC IPC(8): C04B28/00
Inventor 肖锐邓宗才申臣良
Owner BEIJING UNIV OF TECH
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