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The Road Studies with the Pulverized Coal Ash High Performance Concretes

Author: QiaoZhiQin
Tutor: TianXiaoGe；WuBiQing
School: Changsha University of Science and Technology
Course: Traffic and Transportation Engineering
Keywords: High performance concrete Fly ash Pavement Experimental study Engineering applications
CLC: U414
Type: Master's thesis
Year: 2008
Downloads: 182
Quote: 1
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Abstract


This study tests the effects of fly ash on cement and superplasticizer compatibility , the impact on liquidity and mortar strength of cementitious materials . The test results show that the fly ash has played a good role in improving the compatibility of cement and admixture control slump loss . When the cement and fly ash aggregate amount of 360 ~ 500kg / m ~ 3 commonly used interval within the concrete 56d flexural tensile strength higher than 28d flexural tensile strength , indicating that the latter part of the fly ash to improve concrete The strength is very favorable . So , late performance fly ash concrete flexural tensile strength higher , thereby increasing the cement concrete pavement flexural strength and fracture toughness , enhanced resistance the roadbed uneven subsidence adverse impact , meet road performance requirements. Good resistance to freeze-thaw cycles to the larger dosage good quality fly ash obtained ash concrete resistance to chloride ion diffusion performance , the performance of the carbonation resistance and resistance to sulfate and chloride , magnesium salt erosion . In short , the fly ash to help improve concrete durability , this has a very important significance for the concrete road performance . 28d cement concrete abrasion resistance , the maximum dosage of fly ash for cement concrete pavement for about 20% , exceed this dosage , the wear resistance of concrete decreased . Fly ash in high-performance concrete mechanism of action is different from ordinary concrete , high performance concrete , fly ash can reduce the temperature rise of concrete at early age and self- contraction , is conducive to the concrete form intact structure to reduce the micro- cracks occurred improve the volume stability of concrete to improve concrete impermeability , anti- freeze-thaw performance and anti- erosion ability . Performance fly ash concrete is a major breakthrough in traditional concrete technology is an environmentally friendly new \

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