Abstract
Rice husk ash (RHA) is classified as a highly reactive pozzolan. It has a very high silica content similar to that of silica fume (SF). Using less-expensive and locally available RHA as a mineral admixture in concrete brings ample benefits to the costs, the technical properties of concrete as well as to the environment. An experimental study of the effect of RHA blending on workability, strength and durability of high performance fine-grained concrete (HPFGC) is presented. The results show that the addition of RHA to HPFGC improved significantly compressive strength, splitting tensile strength and chloride penetration resistance. Interestingly, the ratio of compressive strength to splitting tensile strength of HPFGC was lower than that of ordinary concrete, especially for the concrete made with 20 % RHA. Compressive strength and splitting tensile strength of HPFGC containing RHA was similar and slightly higher, respectively, than for HPFGC containing SF. Chloride penetration resistance of HPFGC containing 10–15 % RHA was comparable with that of HPFGC containing 10 % SF.
Highlights
The use of locally available materials as well as the use of industrial and agricultural waste in building industry has become a potential solution to the economic and environmental problems of developing countries
Sand concrete is defined as a fine aggregate concrete, in which coarse aggregate is replaced by sand and fine aggregate is by filler material
Rice husk ash (RHA) has been studied to replace silica fume (SF) as a partial Portland cement replacement, and the results show that RHA can fully substitute SF in terms of calcium hydroxide consumption, autogeneous shrinkage, compressive strength and durability of high performance concrete (Bui 2001; Van et al 2013; Feng et al 2004; Le et al 2012; Salas et al 2009) and ultra high performance concrete (Nguyen 2011; Nguyen et al 2011)
Summary
The use of locally available materials as well as the use of industrial and agricultural waste in building industry has become a potential solution to the economic and environmental problems of developing countries. Coarse aggregate is considered as the main ingredient to produce Portland cement concrete. The resources of this material are depleting in many countries or in specific regions, finding a potential substitute for coarse aggregate is crucial. The use of sand (natural or crushed) as a substitute for coarse aggregate to produce sand concrete was investigated. This kind of concrete has strength comparable with conventional Portland cement concrete. Sand concrete is defined as a fine aggregate concrete, in which coarse aggregate is replaced by sand and fine aggregate is by filler material
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