再生骨料混凝土及强和耐久性原VIP专享

精品文档---下载后可任意编辑杨正大（福州市城乡建设进展总公司，福州，350007）摘 要：与常规骨料混凝土相比，再生骨料混凝土因骨料的结合状况而导致了其自身强度的降低。添加适量粉煤灰的再生骨料混凝土在整体性能有了实质提高。最后将常规混凝土（不含粉煤灰）和再生骨料混凝土（含 10%粉煤灰）的耐久性能进行了对比讨论。评估耐久性考虑的参数有：干缩力，吸水率，透水性，抗酸性及抗硫酸盐侵蚀性。结果表明，添加的 10%粉煤灰也提高了再生骨料混凝土的耐久性能，并且也为再生骨料代替常规骨料的可行性提供了有力支撑。关键词：再生骨料混凝土，粉煤灰，透水性，抗酸性，耐久性Strength and Durability of Recycled Aggregate ConcreteYang-zhengda(Fuzhouurban and rural construction and development general company.350007)Abstract:The incorporation of recycled concrete aggregate generally decreases the strength of recycled aggregate concrete ( RAC ) as compared to that of similar conventional aggregate concrete. With the optimum addition of fly ash replacing cement (10% for the present mixture in the study), the overall behaviour of RAC can be improved substantially. Finally, a comparison on durability properties of conventional and recycled aggregate concrete without / with 10% fly ash addition has been made. The parameters considered to evaluate durability are drying shrinking strain, water absorption, water permeability, acid resistance and sulphate resistance.The results show that the 10% addition of fly ash also improves the durability of RAC and provide a strong support for the feasibility of using recycled aggregate instead of conventional aggregate.Key words:recycled aggregate concrete, fly ash, water permeability, acid, durability resistance,1 引言使用回收的混凝土废弃物作为骨料（主要作为粗骨料）来生产新的混凝土，不仅节约了丢弃处理成本，而且保存了自然资源，在一定程度上也带来经济效益。为了解再生骨料混凝土的性能，很多文献[1][2][3]对使用回收骨料的再生混凝土进行...