Use of Ground Bagasse Ash to Improve Compressive Strength, Water Permeability, and Chloride Resistance of Recycled Aggregate Concrete

Abstract

This research aims to utilize waste from sugar industry (bagasse ash) as a pozzolanic materialto partially replace cement to improve compressive strength, water permeability, and chloride resistanceof recycled aggregate concrete. The 28-day designed compressive strength of conventional concrete was350 ksc. Recycled aggregate was used to fully replace crushed limestone in the mix proportion of theconventional concrete for producing recycled aggregate concretes. Ground bagasse ash was used topartially replace cement at 20, 35, and 50% by weight of binder in recycled aggregate concrete. Compressivestrength, water permeability, and chloride penetration depth of concretes were investigated.

The results revealed that the suitable replacement of ground bagasse ash to obtain the goodlong-term compressive strength, low water permeability, and high chloride resistance of recycled aggregateconcrete was 20% by weight of binder. The use of ground bagasse ash to partially replace cement couldimprove water permeability of recycled aggregate concrete to be lower than that of conventional concreteabout 2-3 times and lower than that of recycled aggregate concrete without ground bagasse ash about 3-5times. Moreover, it could also help to increase the chloride penetration resistance of recycled aggregateconcrete. The chloride penetration resistance was increased with the increasing of the replacement ofground bagasse ash.

Keywords : Bagasse Ash / Recycled Aggregate / Water Permeability / Chloride Resistance