EFFECT OF SUGARCANE BAGASSE ASH ON ALKALI SILICA REACTION OF CONCRETE WITH SODA LIME GLASS AS AGGREGATES

Abstract

Utilization of waste materials for construction use has received much attention lately in the hope of contributing to saving the environment by lessening the impact of construction. This study utilized soda lime glass in concrete as substitute for fine aggregates. However, since soda lime glass promotes alkali-silica reaction, its addition to concrete will not come without risk. Sugarcane bagasse, the unused stalk of sugarcane, when burnt into ash, is a good pozzolanic material. It also has the capability to arrest the expansion brought about by alkali-silica reaction. Therefore, when added to concrete with soda-lime glass, it can lessen the alkali-silica reaction. This study employed sugarcane bagasse ash, as partial replacement of cement, in concrete with soda-lime glass. The amount of soda-lime glass in concrete used in the study ranged from 10-40% replacement of sand, while that of sugarcane baggase ash are 5% and 10% replacement of cement. Compressive strength was determined in 7 and 28 days. Scanning electron microscopy (SEM) was conducted to examine the microstructural change in concrete. To investigate the alkali-silica reaction, measurement of mortar expansion using mortar bar test in accordance with ASTM C1260, was conducted. Some of the significant findings of the study are: (1) addition of soda lime glass, up to 30% replacement of sand, contributes to an increase in compressive strength, and (2) length expansion, due to alkali silica reaction, in concrete with soda lime glass was reduced with sugarcane bagasse ash.