PERBANDINGAN KARAKTERISTIK PADA CAMPURAN BETON DENGAN PENAMBAHAN VARIASI UKURAN LIMBAH STYROFOAM

Abstract

Mixing concrete with styrofoam waste could help reduce waste in Indonesia. Aside from reducing the
existing waste, this study also aims to determine the characteristics of concrete against Styrofoam waste
substitution and the optimum value obtained from the results of its concrete testing. The methodology
used is an experiment that is a research method to determine specific effects. This study uses two size
variations of Styrofoam waste, small size (2 – 4.75mm) and large (4.75mm – 20mm), using the additional
percentage of 0%, 15%, 25%, and 35%. As for the testing objects, we are using 42 testing objects with a
test age of 7 days and 28 days. From the results of 28 days age test, normal concrete has a split tensile
strength value of 1.91 Mpa concrete with the addition of small size styrofoam waste has rougher surface
properties than ordinary concrete and has a split tensile strength value with a percentage of 15%, 25%,
35% of 2.07 MPa, 1.54 MPa and 1.70 MPa and the optimum value was obtained at the percentage of
15% at 2.07 MPa. Concrete with the addition of large size variations has concrete properties that
produce voids in the concrete that are larger and result in a lighter weight than normal concrete. The
split tensile strength values of concrete with percentages of 15%, 25% and 35% are 1.86 MPa, 1.80 MPa,
and 1.43 MPa. The optimum value obtained on this large-size styrofoam occurred at a percentage of 15%
at 1.86 MPa.