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Research and Application of Non-Steam Curing Reactive Powder Concrete

Author: ShangGuanYuMing
Tutor: LiQiuYi
School: Qingdao Technological University
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Reactive powder concrete Free steam curing PL powder High strength and well grate
CLC: TU528.31
Type: Master's thesis
Year: 2010
Downloads: 126
Quote: 0
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Abstract


Reactive powder concrete (Reactive Powder Concrete RPC) is a new structural material with good mechanical properties and durability at home and abroad have sent its widely used in engineering practice. RPC materials instead of traditional concrete structure design, can make the structure light and to improve structural span, and greatly improve the durability of the structure, reducing use during maintenance costs. In order to reduce the the RPC production costs, and to promote the RPC in municipal engineering, test combined with the national \instead of the standard gray, natural sand sand standard curing system alternative to steam curing successful preparation of a lower price free steaming feed powder concrete. Studied the mechanical properties of the concrete, durability and shrinkage properties. And autoclaved feed sexual powder concrete production of high-strength rain grates, and the results have been applied for invention patent (Patent Name: Free steam feed powder concrete, application number: 200910310966.4). The results show that: the comparison of four admixtures, PL powder is more suitable for the preparation of reactive powder concrete. PL powder, 52.5 cement, natural sand, steel fiber and superplasticizer raw materials, high strength autoclaved feed powder concrete can be prepared by standard curing the concrete 28d flexural strength of up to 29.3 MPa, compressive strength of up to 120.7 MPa , the price is only half of the reactive powder concrete, to promote the development and application of reactive powder concrete. Free the steam curing RPC strength increases with increasing content with PL powder, reduce the dosage greater than 15%, the strength increase is relatively slow; ratio increases, the first increase with the mastic mastic ratio of 1.2, the highest intensity; increase with the increase of Superplasticizer dosage; increase with the increase of steel fiber. Free evaporated feed powder concrete has excellent durability and a smaller shrinkage values. Chloride ion diffusion coefficient is an order of magnitude lower than the C40 concrete, more than double than the C80 high strength concrete. RPC28d zero carbonation depth. RPC28d contraction of 60% of the value of C40 ordinary concrete shrinkage values. With autoclaved feed prepared powder concrete strength well grate carrying capacity than ordinary concrete well grate, to meet the Beijing local standards requirements of heavy duty well grate; of high strength stormwater grates successfully developed to solve the the cast iron wells grate stolen and the drawbacks of traditional concrete well grate, resulting in a significant economic and social benefits.

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CLC: > Industrial Technology > Building Science > Building Materials > Non-metallic materials > Concrete and concrete products > High strength concrete, early strength concrete,rapid hardening concrete
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