Constructive learning through experiments utilization of pandan leaf fiber as a strengthening of composite material

Abstract

This research was aimed at examining constructivist learning through experiments examining the feasibility of pandan leaf fibers as reinforcement of composite materials. The method used in the study was an experiment, namely conducting an experimental activity of the tensile strength of pandan leaf fibers compared to glass fiber, to obtain new knowledge as an alternative material for reinforcing composite materials. In this case, the pandan leaves studied were taken from the Kepuharjo area of Cangkringan Sleman DIY. Data analysis techniques used were qualitative descriptive, and quantitative descriptive. The results of this research indicated that; (1) constructivist methods were feasible as alternative paradigms for learning science and technology built through the Input-Process-Output pattern; (2) tensile fiber strength was 1.5 times the tensile strength of glass fiber. The tensile strength of pandan fiber was 39,036 kg / mm2 while the tensile strength of glass fiber was 21,65 kg / mm2; (3) the tensile strength of natural composites was lower than synthetic composites. Natural composite tensile strength was 3.03 kg / mm2 while tensile strength of synthetic composite was 3.77 kg / mm2; (4) the increase in formalin concentration for pandan fiber immersion media in the range 0 - 35% had an effect on decreasing tensile strength with the equation y = -640.05x3 + 285,12x2 - 36,358x + 39,105 and R2 = 0.9641. In conclusion, fiber from pandan leaves is suitable to be used as a composite material, but a suitable matrix and suitable treatment have not been found.