The influence of glass waste use as a fine aggregate substitution towards concrete’s splitting tensile strength, absorption and porosity using fly ash as 10% substitution of cement weight

Abstract

The objectives of the research are to identify the variation of waste glass used as a partial substitution of fine aggregate toward concrete’s splitting tensile strength, absorption, and porosity using fly ash for 10% substitution of cement weight. Percentage of the use waste glass as a substitution fine aggregate of the optimal to obtain maximum of splitting tensile strength concrete, minimal of absorption and porosity concrete. The research employed an experimental method in a laboratory by sampling test. The samples used in the research were 20 cylinders with 150-mm diameter and 300-mm height for concrete splitting tensile strength test and 20 cylinders with 110-mm diameter and 60-mm height for concrete absorption test and porosity test. Glass powder variations were 0%, 10%, 20%, 30% and 40% to replace fine aggregate. Each of them had 4 samples. Glass powder substitution variations as fine aggregate had influence which was not significant toward concrete’s splitting tensile strength, absorption and porosity because the influence was 4.7%, 23% and 16.7%. The optimum glass powder percentage as fine aggregate substitution producing maximum tensile strength is on 10% of glass powder replacement producing 2.7 MPa, higher than normal concrete’s splitting tensile strength is 2.36 MPa. It indicates that the increase in splitting tensile strength is 14.41%. The optimum glass powder percentage as fine aggregate substitution producing minimum absorption is on 10% of glass powder replacement which is 6.571%, lower than normal concrete’s absorption is 6.683%. It shows the decrease of concrete absorption which is 1.57%. The optimum glass powder percentage as fine aggregate substitution producing minimum concrete’s porosity is on 10% of glass powder replacement which is 14.488%, lower than normal concrete’s absorption is 15.065%. It suggests the decrease of concrete absorption which is 3.98%.