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Research of the Mix-Sand Concrete

Author: HuangHongSheng
Tutor: YangChangHuiï¼›PengXingGuo
School: Chongqing University
Course: Materials Engineering
Keywords: Mechanisms sand Mixed sand Concrete
CLC: TU528
Type: Master's thesis
Year: 2005
Downloads: 261
Quote: 9
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Abstract


Fine aggregate concrete prepared raw materials, have an important impact on the quality of the merits of the physical and mechanical properties and durability of concrete mixture workability and hardened concrete. Natural coarse sand as fine aggregate concrete prepared at home and abroad practice, but preferred natural sand fewer and fewer resources and construction boom have become increasingly prominent. Environmental protection and sustainable development has become the world's development strategy. The concrete industry how to make the best of, as far as possible to reduce the cost of production of concrete as the basic principle. The new national standard GB/T14684-2001 \Extra fine sand applications has become a feature of Chongqing, but compared with ordinary concrete, extra fine sand concrete large amount of cement, sand is low, the viscosity of the mixture, poor wear resistance, shrinkage is relatively large, these features severely restricted the extra fine sand in road works, high-strength concrete works and prestressed concrete engineering. Separate mechanisms sand preparation of fluidity concrete is difficult to meet the pumping requirements, the mechanism sand with extra fine sand mixed-use technical approach can overcome the shortcomings when used alone fine aggregate particles less than normal, extra fine sand coarse particles, help to reduce the amount of cement per unit volume of concrete to improve the workability of the concrete mixture to improve the density and strength of concrete. In this paper, the preparation of a the liquidity mixed sand concrete, sand-mixed concrete mechanical properties, long-term performance and durability, summed up the related engineering application of statistical information, research the following conclusions: (1) sand mixed concrete mix proportion design in accordance with natural sand with the design approach to design, and the strength to meet the requirements of the concrete strength guaranteed rate. (2) mixing the sand fineness can be adjusted by changing the mechanism of sand and extra fine sand mixing ratio of. Mixed sand fineness modulus than proportional to its component quality, extra fine sand mechanism applicable to sand blending ratio of 8:2 to 6:4. (3) the mechanical properties of concrete the mechanism sand with extra fine sand mixed composite sand preparation is fully able to meet the design requirements, with basically the same in the sand preparation of concrete. (4) sand mixed concrete creep and shrinkage in the sand quite concrete. (5) With the improvement of the concrete strength grade of sand mixed concrete penetration resistance, abrasion resistance and resistance to rapid thermal enhancement. (6) mixed sand can be used for the preparation of high fluidity concrete, select the appropriate blending ratio, the preparation of the work of the concrete mixture with the ratio of natural sand concrete considerable.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products
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