Manufacturing and Characterization of High Water Absorbtion Paving Block by Utilizing Waste of Coffee Skin and Pumice with Polyurethane Resin
Harahap, Silva Fayruzha Pahrun
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Paving block has a high water absorption with coffee shell and pumice and polyurethane resin has been successfully made and characterized. In this study, the composition of coffee shells are 0 gram, 2 grams, 4 grams, 6 grams, 8 grams and 10 grams with variation of polyurethane resins are 15 grams, 20 grams and 25 grams. The characterization of high water absorption paving block includes physical properties (density, porosity and water absorption), mechanical properties (compressive strength, tensile strength and flexural strength) and microstructure analysis using SEM-EDX. The results of the characterization of physical properties shows that the paving block has a high water absorption with the best composition of sand, pumice, coffee shell and polyurethane resin (60:14:6:20) grams, the density is 1.6195 g/cm3, porosity is 20% and water absorption is 12.3495%. On the other hand, the mechanical properties of compressive strength is 11.61 MPa, tensile strength is 6.41 MPa and flexural strength is 8.68 MPa. High water absorption paving block that are made and characterized in this study will be used as water absorbing material on the highway in order to reduce flooding. This is reinforced by the results of SEM-EDX microstructure testing with a hollow structure in the composition (60:14:6:20) grams and it is compared to the composition (60:20:0:20) grams.