Abstract

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Title:: Experiment About Influence of Silica Fume on Compressive Performance of Fiber Reinforced Rubber Recycled Concrete

Author(s):: XIE Jian-he; LI Zi-jian; SUN Ming-wei; School of Civil and Transportation Engineering, Guangdong University of Technology

Keywords:: recycled concrete; silica fume; rubber; polypropylene fiber; steel fiber; compressive performance

Abstract:: Taking normal concrete and rubber recycled concretes as the research objects, the mothed of reinforcing compressive performance of environmental concrete was studied through adding silicon powder and fiber materials. Recycled concrete aggregate was introduced into the concrete mixture by 100% volume fraction to replace coarse aggregate. The crumb rubber content was at levels of 20% by mass fraction to replace fine aggregate, and the silica fume content was used at levels of 10% by mass fraction to replace cement or at level of 3% by mass fraction in addition, and polypropylene fiber or steel fiber was added to the concrete. A total of 4 groups of concrete specimens (12 cubes) were casted. Through axial compression tests, failure modes, compressive strength and workability of the concrete were analyzed. The results indicate that comparing with the concrete with only adding silica fume, the incorporation of both fiber material and silica fume can further improve the compressive performance of concrete. The addition of silica fume can strengthen the interfacial performance between paste and crumb rubber, and improve the compressive strength of rubber and steel fiber reinforced recycled aggregate concrete. However, both silicon fume and fiber materials have negative influences on the workability of concretes, and a certain content of water reducer is supposed to use in the mixture.