An Experimental Study on Self-compacting Concrete by Packing Density Method

Abstract

In the 21st century concrete had reached a big mile stone, invention of self compacting concrete (SCC), compaction of concrete was done by its own weight. SCC is a heterogeneous material; hence some problems are there to obtain the proportion of SCC. Some researchers have developed the design procedures to get the proportions of SCC, however very few studies found in establishment of relationship between water binder ratio (w/b) and compressive strength of concrete.Hence, more research has to be done on relationship between w/b ratio and compressive strength with different combination of materials with help of available mix design. From the all available design methods of SCC, Packing density method will give aggregate proportions appropriately and paste content also determined appropriately.In this study, experimental workwas carried on to develop a relationship between the compressive strength of concrete to w/b ratio using Packing density method. In First stage, packing density of aggregate was conducted for mixture of 20mm of aggregate with 10mm aggregate, River sand and Crushed sand individually. After that, packing density was determined for mixture 20mm aggregate, 10mm aggregate and crushed sand. Mix design was carried out based on packing density Method with w/b ratios 0.38, 0.40, 0.42. Fresh Properties of Self-compacting concrete was determined by Slum flow, L-box, V-funnel with different dosage of Super Plasticizer (SP) and compressive Strength was determined. Effect of w/b ratio and S.P dosage on compressive strength was studied through Graphs. Finally a relationship between the w/b ratios to Compressive strength of concrete was developed through linear Regression analysis in MS Excel sheet.