Effect of basalt mineral concentration as PCC cement substitution material on mortar products

This research was conducted to study the effect of variations in the weight concentration of basalt minerals as a PCC type cement substitution material for mortar products. The basalt powder used was able to escape from the mesh size mesh of 325 and 400. In this work, the weight of PCC cement concentration was varied from 10, 20, 30, and 40 %. The analysis shows that the basalt qualifies as a cement or pozzolan substitution material based on ASTM C618 with SiO2+Al2O3+Fe2O3 of 80.116 % and the basalt diffractogram pattern shows the basalt dominant phases namely Anorthite, Augite, Forsterite, and Quarts or Silicon Oxide. The highest compressive strength in PCC cement mortar was at the mesh size of basalt of 400 reached 4.8 MPa followed by a percentage of specific gravity of 2.6444 gr/cm(3), fuel shrinkage of 3.17 %, the porosity of 1.23 % and absorption of 9,53 %. While the compressive strength of PCC cement mortar no.325 basalt mesh powder reached 4.6 MPa followed by the percentage of specific gravity of 2.4444 gr/cm(3), fuel shrinkage of 3 %, the porosity of 1.33 %, and absorption of 10.05 %. The dominant phase is in the PCC type mortar, namely CASH, quartz, calcite, and portlandite.