Title : ENHANCEMENT OF DURABILITY PROPERTIES OF RECYCLED AGGREGATE CONCRETE BY TWO STAGE MIXING APPROACH
Authors : Nishikant Kisku, Sarat Kumar Panda, V Pandey
Publication : 8 - 10, October 2015
Volume : 2
Pages :
Price : 250
Abstract : This paper focuses on enhancement of mechanical and durability properties of recycled aggregate concrete (RAC) casted by using recycled concrete aggregate (RCA) from construction and demolition waste. Use of recycled concrete aggregate solves two important issues ie. sustainable materials in construction industry and reduction in consumption of natural resources.The present experimental study deals with an improved two stage mixing approach (TSMA) and optimization of quantity of silica fume to be replaced by cement for achieving best mechanical and durability properties. In present TSMA, cement- silica fume slurry is thoroughly mixed with RCA in the pre-mix stage so that a thin layer of cement -silica fume slurry is formed on the surface of RCA causing improved interfacial transition zone. After extensive experimental studies it is observed that for M30 mixing proportion, 5% replacement of silica fume with cement gives best mechanical (compressive strength) and durability (carbonation and chloride penetration) properties of RAC. The properties of concrete for two stage mixing approach with silica fume are compared with the properties of concrete for normal mixing approach (NMA). It is noticed that concrete with TSMA gives better properties than concrete with NMA.