Title : DURABILITY PROPERTIES OF RECYCLED AGGREGATE CONCRETE CONTAINING FLY ASH
Authors : Surya M,Lakshmy Parameswaran and VVL.Kanta Rao
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Price : 250
Abstract : The quantity of concrete waste has been increasing significantly over the years due to the demolition and reconstruction of old structures. Efforts have been made to utilize the concrete waste as aggregates in construction to address the environmental concerns such as use of constructible land for dumping of concrete waste, diminishing availability of natural aggregates and so on. A number of studies have been performed to examine the mix design, mechanical properties and structural performance of concrete with recycled aggregates. However, limited studies have been carried out to understand the durability aspects of recycled aggregate concrete and based on which some methods to overcome the negative effects on durability of concrete produced using recycled coarse aggregate have been suggested. Some of these methods include improvement in mixing methods, enhanced curing method and use of cementitious materials like silica fume and fly ash. This paper describes the experimental studies performed to understand the durability characteristics of recycled aggregate concrete of characteristic compressive strength of 40MPa produced with three different replacement ratio of coarse aggregate, i.e., 50%, 75% and 100% and containing fly ash as filler. The characteristics of constituent materials, improved mix design method and casting of various test specimens are discussed. The present study includes understanding the aspects related to water absorption, concrete resistivity and chloride permeability. Also, a comparison of durability properties of recycled aggregate concrete with that of normal aggregate concrete produced with and without fly ash has been accomplished.