Properties of Portland Cement Type v Mortar Mixed with Ground Rice Husk Ash and Limestone Powder

Abstract

The objective of this research is to study the Properties of Portland cement Type V mortar mixed with Ground Rice Husk Ash (GRHA) and two types of limestone powder (LS1 and LS2). The physical and chemical properties of Portland cement Type V, ground rice husk ash, and limestone powder were tested. The properties of mortar such as water requirement, compressive strength, compressive strength loss and drying shrinkage were investigated. The solutions used in this study were sodium sulfate (Na2SO4) and magnesium sulfate (MgSO4). The concentrations of both solutions were 5% by weight in accordance with the ASTM C 1012 standard. GRHA, LSI, and LS2 have particle sizes of 29, 12 and 128 μm. The replacement levels of GRHA, LS1, and LS2 in Portland cement Type V were 0%, 20% and 40% wt. of cementitious materials. The ratio of water to cementitious material was controlled based on the water requirements conforming to flow value at 110 ± 5%. The results showed that the compressive strength of mortar was decreased with increase the percentage replacements of GRHA and LS in Portland cement Type V. At 180 days, the compressive strength of all mortars was lower than that of the control mortar. Mortar containing 20% of GRHA and LS (C80R10LS110) was the highest development in compressive strength and as high as that of the control mortar. From the results of sulfate resistance, it was found that the higher was the percentage replacements of GRHA and LS in Portland cement Type V, the lower was the strength loss and drying shrinkage of mortar. The strength loss of mortars in magnesium sulfate solution was more than those in sodium sulfate solution.