An Experimental Study on Effect of Ratio of Different Sized Coarse Aggregates on Compressive Strength of Self Compacting Concrete

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An Experimental Study On Effect Of Ratio Of Different Sized Coarse Aggregates On Compressive Strength Of Self Compacting Concrete

An Experimental Study on Effect of Ratio of Different Sized Coarse Aggregates on Compressive Strength of Self Compacting Concrete

Abstract

Self-Compacting concrete (SCC) needs no external vibration and compacts fully under its self weight. This paper describes experimental work carried out to develop SCC and to study the effect of different sizes (i.e., 20mm; 16mm; 12.5mm and 10mm) of coarse aggregate (C.A) on the properties of SCC. Eight mixes were investigated for M30 grade concrete. The water-powder ratio was kept fixed throughout the SCC mixes. The superplasticizer (S.P)(Structuro 100) and viscosity modifying admixture (V.M.A)(Structo 480) dosages was determined from mortar trails.

To achieve self-compacting properties, successive replacement of C.A by fine aggregate was adapted. Slump flow test, V-funnel test, J-ring test and L-box test on fresh concrete were carried out as per EFNARC guidelines. The compressive strength, split tensile strength and flexural strength of the concrete after 7, 28 &56 days curing were also investigated.

Conclusion

After thorough study on literature, experimental investigations and discussions of outcomes; following conclusions on drown.

  • The rodded density of coarse aggregate is very high at 0%CA and voids ratio of is very lowest at 0%CA.
  • The results of fresh concrete satisfy the limits of test for all percentage of substitute of 20mm coarse aggregate, except 0%CASCC for V-T5 minutes and 50%CASCC for Orimet test.
  • The 30%CASCC of partial replacement of coarse aggregate gives the good range of compressive strength of specimens after curing period of 7days, 14days and 28days, compared with other percentage of substitutes