Improvement of Cement Substitute Materials from Mission Grass for Concrete Block Manufacture
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Abstract
This research is to study the chemical composition using X-ray fluorescence spectrometer, comparison of the physical properties of Pennisetum pedicellatum mortar between using sodium hydroxide at a concentration of 15% and without sodium hydroxide for surface improvement for concrete block manufacture, the ratio of Pennisetum pedicellatum replaced cement in 0, 10, 20, and 30 %wt. Using acrylic block of size 5x5x5 cm, the compressive strength and density of incubated mortar were tested at 0, 14 and 28 days. The results showed that the compressive strength and density without sodium hydroxide treatment is the highest average compressive strength after curing for 14 days in Pennisetum pedicellatum mortar replaced 30%wt of cement, equal to 14.25 MPa. And the highest density of mortar that curing 14 days, the Pennisetum pedicellatum mortar replaced 10%wt cement, equal to 1.59 g/cm3. Sodium hydroxide surface-improved perennial Pennisetum pedicellatum mortar. Is the highest average compressive strength after curing for 0 days, Pennisetum pedicellatum mortar replaced 20%wt of cement equal to 12.19 MPa. The density of mortar that curing 14 days, Pennisetum pedicellatum mortar replaced 20%wt cement equal to 1.73 g/cm3. The amount of Pennisetum pedicellatum fiber and the curing time affected the density and compressive strength.
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