Compressive Strength and Static Modulus of Elasticity of Periwinkle Shell Ash Blended Cement Concrete

Abstract

The study examined the effect of periwinkle shell ash as supplementary cementitious material on the compressive strength and static modulus of elasticity of concrete with a view to comparing it’s established relation with an existing model. The shells were calcined at a temperature of 800 o C. Specimens were prepared from a mix of designed strength 25N/mm 2 . The replacement of cement with periwinkle shell ash (PSA) was from 0 to 40% by volume. A total of 90 cubical and cylindrical specimens each were cast and tested for 7 to 180 hydration periods. The results revealed that the PSA met the minimum chemical and physical requirements for class C Pozzolans. The compressive strength and static modulus of elasticity were observed to increase with increased in curing age but decreased with increasing PSA content. The design strength was attained with 10%PSA at standard age of 28 days. In all the curing ages, 0% PSA content recorded higher value than the blended cement concrete. the statistical analysis indicated that the percentage PSA replacement and the curing age have significant effect on the properties of the concrete at 95% confidence level. The relation between compressive strength and static modulus of elasticity fitted into existing model for normal-weight concrete.