The Effect of Bioconc Against Compressive Strength of Paving Concrete Combining Natural Materials

Abstract

The use of additive concrete mixtures is commonly used to increase the concrete compressive strength. This study aims to see the effect of using Bioconc additives in combination with natural ingredients in increasing concrete compressive strength and reducing the use of cement. Natural materials used in concrete mixtures are fibers and coconut shells, bamboo and snail shells. The specimens measuring 15 cm x 15 cm x 15 cm with the percentage composition of each natural ingredient is 10% in coarse aggregate substitution and the addition of 500 ml/m3 of the Bioconc concrete mixture to the target K300 (24.9 MPa). Reduction of cement use 10% (R10), 15% (R15), 25% (R25) as much as each percentage is 5 pcs and tested at 28 days. The compressive strength results obtained from testing the average specimen of each natural material and the optimum percentage of cement reduction for fibers and coconut shell R10 = 26.27 MPa, R15 = 23.92 MPa, R25 = 19.39 MPa, Roptimum = 13%; bamboo R10 = 26.83 MPa, R15 = 22.59 MPa, R25 = 16.52 MPa, Roptimum = 12%; Snail Shell R10 = 17.89 MPa, R15 = 14.68 MPa, R25 = 12.35 MPa, Roptimum = 9%. While for the absorption of the average of each natural material for fibers and coconut shell = 2.28%, bamboo = 2.67%, and Snail Shell = 1.71%. Based on the results obtained with the target of K300 concrete compressive strength it can be concluded that the optimum cement reduction with substitution of natural fibers and coconut shell material is equal to 13% and for the average absorption is bamboo natural material substitution of 2.67%.