Abstract

Info

Title:: Experiment on Mix Proportion of Reactive Powder Concrete with Rice Husk Ash

Author(s):: ZHU Peng; LI Zong-yang; QU Wen-jun; MAO Wen-ting; College of Civil Engineering, Tongji University

Keywords:: rice husk ash; reactive powder concrete; strength; flowability; shrinkage; chloride-penetration resistance; water binder ratio

Abstract:: The mix proportion of reactive powder concrete (RPC)with rice husk ash was investigated through experiment.On the basis of maximum density theory, the primary mix proportion of RPC with rice husk ash was designed. Influences of two kinds of fine aggregate, such as quartz sand and natural sand, on the property of RPC were investigated. Experiments on RPC with different water binder ratios were done, and a range for water binder ratio was suggested. The rice husk ash was used to replace the silica fume in RPC, and the influences of the replacement ratio on flowability, strength and durability were investigated. The results show that there is little influence on flexural strength, compressive strength and fluidity by taking natural sand as fine aggregate replacing quartz sand. The appropriate water binder ratio of RPC with rice husk ash is 0.20-0.22. With the increasing of amount of rice husk ash replacing silica fume, the shrinkage rate reduces and change slowly with ages，and the chloride-penetration resistance reduces. It is suggested that the silica fume in RPC can be replaced by rice husk ash partially or completely according to different application requirements