Synthesis and characterization of polymer concrete withpumice aggregate and singkut leaf fiber as filler

Polymer concretehave been made based sand, pumice, epoxy resin, and singkut leaf fiber as fillers. The manufacture of polymer concrete uses block-shaped molds with a size of 100 mm x 20 mm x 10 mm with the press molding method using a hotpress. Variations in the composition polymer concrete of sand, pumice stone, singkut leaf fiber, and epoxy resin, namely 60:20:0:20 g, 60:18:2:20 g, 60:16:4:20 g, 60:14:6:20 g, 60:12:8:20 g, and 60:10:10:20 g. The variation in the composition was made into 2 groups of variations based on the concentration of NaOH used to singkut the leaves, namely the leaves with immersion of 5% NaOH and 13% NaOH. The polymer concrete then characterizes its physical properties (density and water absorption), mechanical properties (flexural strength, compressive strength, tensile strength), and SEM-EDX. The results of characterization carried out on concrete samples, show that the best composition is (60:18:2:20) g (5% NaOH content) with a density value of 1.74 g/cm³, water absorption of 0.34%, flexural strength. amounted to 37.07 MPa, compressive strength of 60.18 MPa, tensile strength of 8.33 MPa. The results of microstructure testing showed that the polymer concrete samples with a mixture of sand, pumice, epoxy resin, and singkut leaf fiber were mostly dominated by the element C (carbon).