Effect of GGBFS on Compressive Strength, Porosity, and Absorption in Mortars

Abstract

This research aims to determine the influence of Granulated Blast Furnace Slag (GGBFS) as an ingredient partially added cement in the making of mortar against compressive strength, porosity, and absorption of mortar. This method of research uses experimental methods. The Mortar mixture used is 1 PC: 2 PS and 0.5 cement factor. GGBFS variations are used at 0%, 10%, 20%, 30%, 40%, and 50% of the weight of cement. This research used cubes with a size 5 cm × 5 cm × 5 cm with a sample amount of 36 pieces with a test age of 7 days. The research results gained compressive strength mortar than mortar control, but at a percentage of 30%, GGBFS bagasse ash in a portion of cement has decreased in strength. Compressive strength at the age of 7 days obtained 10.93 MPa; 11.73 MPa; 17.33 MPa; 10.8 MPa; 16.27 MPa, and 16.8 MPa. The compressive strength the maximum average found in the variation of 20% and a variation of 20% GGBFS is a variation that meets the Type M Mortar plan’s compressive strength of 17.2 MPa.