MECHANICAL PROPERTIES OF HIGH STRENGTH CONCRETE CONTAINING RECYCLED CONCRETE AGGREGATE WITH GROUND BAGASSE ASH

Abstract

This research aims to utilize bagasse ash, a by-product acquired from burning
bagasse for an electricity generation power plant in a sugar factory, as a binder
to partially replace Portland cement. In addition, recycled concrete aggregate,
which was obtained from crushing demolished concrete columns, were used
as a substitute for crushed limestone in high strength concrete (HSC). The
mechanical properties of concrete including compressive strength, modulus of
elasticity, and splitting tensile strength were investigated. The results
demonstrated that use of ground bagasse ash (GBA) as 20% by weight of
binder to replace OPC could promote the compressive strength of the
recycled aggregate concrete (RAC) to be higher than control concrete (CT) at
later ages (60 days or more). In addition, all concretes exhibited compressive
strengths higher than 55 MPa suggesting that they are high strength concrete.
However, the use of recycled concrete aggregate as a full replacement for
crushed limestone had negative impacts on the modulus of elasticity and
splitting tensile strength of concrete, whereas GBA had a slightly positive
effects on modulus of elasticity and splitting tensile strength of RAC.