Abstract
Packingdensitymethodof mixdesign of concreteisnewmethodtodesigndifferent types of concrete. The mix design obtained from the packing density method hassuitableworkability,maximumpackingdensityandminimumvoidsratio.Thegeometrical characteristics like shape, size and proportion of fine aggregate and coarseaggregate affect packing density. The objective of this research is to study the mix designof concrete using packing density method anddevelop thecorrelation between bulkdensity, packing density and voids ratio. In this work large number of trail to decide theproportion of aggregate for that optimum bulk density and packing density calculated fordifferentvaryingproportionof20mm:12.5mmcoarseaggregate(i.e.90:10,80:20,70:30,65:35,60:40and50:50)andforvaryingproportioncoarse aggregate:fine aggregate (i.e. 90:10, 80:20, 70:30, 60:40, 55:45 and50:50). To finalize the mix designusing packing density method also varies the percentage of excess cement paste (i.e. 5%,7%, 9%, 10%, 11% and 12%). Tests were performed for the properties of fresh concretelike workability test (Slump cone) and hardened concrete like compressive strength, split-tensilestrength,pull-outtest,reboundhammerandflexuralTestetc.testsweredetermined at 7, 14 and 28 days. The obtained results for above mentioned test usingpackingdensitymethodat9%ofexcesscementpastearesatisfyingthestandardresults.
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