Effect of Activator on Mechanical Properties and Porosity of Cement-Base Repair Mortar

Abstract

This study investigated the different effect of three chemical activators on mechanical properties and porosity of cement-base repair mortar, whose binder consists of 80% cement and 20% mineral admixture. Test of mechanical properties indicate that the addition of 5% chemical activator A increase both the early and later strengths of repair mortar. The presence of 3% chemical activator C increase the early strength but has no significantly affect on the later strength. Measurement of pore structure indicate that repair mortar with chemical activator has lower total porosity and finer pore structure due to the presence of chemical activator which accelerate the pozzolanic reaction and densify the mortar pore structure.