SOLID WASTE-SILICA COMPOSITE FOR HIGH STRENGTH AND LIGHTWEIGHT MATERIAL APPLICATION
Abstract: The solid waste
composite was successfully made. Preliminary, the composite was synthesized
using polyurethane as binder mixed with the solid waste using simple mixing
method and then hot-pressed at at pressure of 4 metric-tons and temperature of
100°C for 20 minutes. To enhance its strength, silica nanoparticles with varied
content then were added in the polyurethane-solid waste mixture. From the
compressive strength test, it was obtained that polyurethane-solid waste
composite with solid waste volume fraction of 87.15% had optimum compressive
strength of 160 MPa. Meanwhile, for silica addition with the fraction of
0.4975%, the compressive strength became 200 MPa, or increased 23% of that
without nanosilica. The enhancement was also briefly confirmed from FTIR
Spectroscopy where some polyurethane spectra shifted small due to silica
addition, especially in amine and carbonyl groups as its active groups. The
strength is better than of brick (80 MPa), shalestone (73 MPa), silstone (92
MPa) and other stones. From density measurement, the composite-produced has
density about 0.7 g/cm3 that comparable to Jati (Tectona grandis) and Mahoni
(Swietenia macrophylla) having densities about 0.8 g/cm3 and 0.7 g/cm3
respectively. Therefore, this composite is very adequate for building material
application to compete the woods.
Author: M. Masturi, S. Rustad,
S. Sunarno, N. Hindarto
Journal Code: jpfisikagg160003

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