Convenient and fast construction type 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 limited silica fume output, slow increase in the strength of active powder concrete, and large fluctuation of components, and achieve the effect of simplifying production
Inactive Publication Date: 2014-04-02
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 makes it difficult to meet the needs of concrete engineering; silica fume participates in secondary water Therefore, the strength of reactive powder concrete increases slowly, which is particularly prominent in the case of normal temperature curing; too many admixtures used in reactive powder concrete will make the preparation process too cumbersome, and some admixtures themselves There is a problem of large fluctuations in composition, which is not conducive to the large-scale application of reactive powder concrete
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[0020] 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:
[0021]
[0022] The ultrafine cement is ultrafine Portland cement with a strength grade of 52.5 and a density of 3.07g / cm 3 , specific surface area: 568m 2 / kg;
[0023] The sand is natural quartz sand with a particle size ranging from 40 mesh to 70 mesh;
[0024] The water mentioned complies with the provisions of JGJ63-89 of "Concrete Mixing Water Standard";
[0025] The main component of the described water reducer is polycarboxylate water reducer;
[0026] The steel fiber has a length of 8 mm, a diameter of 0.12 mm, and a tensile strength of not less than 2850 MPa.
[0027] Its production process is as follows:
[0028] Pour the weighed ultra-fine cement and sand into the mixing pot and stir slowly for 1 minute, then stir slowly for 2 minutes and pour the mixed water and water reducer into...
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Abstract
The invention relates to convenient and fast construction type active powder concrete for superfine cement mixed construction and belongs to the technical field of cement. The convenient and fast construction type active powder concrete comprises the raw material ingredients including superfine cement, sand, water and water reducing agents according to a proportioning rate being 1:(0.7-1.5):(0.14-0.2):(0.01-0.05) through being calculated by weight, wherein the superfine cement is prepared by using normal cement or cement clinker as raw materials through being ground to the specified fineness, and the specific surface area of the superfine cement is greater than 500m<2> / kg. The convenient and fast construction type active powder concrete 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 an active powder concrete, in particular to a convenient construction active powder concrete mixed with ultrafine 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:...
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IPC IPC(8): C04B28/00
Inventor 邓宗才申臣良肖锐
Owner BEIJING UNIV OF TECH