Stabilization of Recycle Material by Geopolymer from Bagasse Ash for Base

Abstract

At present, the reduction of natural aggregates causes the high cost of pavement materials. However, the amount of road demolition is increasing, which is a cause of waste disposal. Therefore, this research has an idea to use recycled asphalt pavement and recycled crushed rock to improve the quality by geopolymer from bagasse ash as a pavement material according to the standard of cement-mixed rock pavement of the Department of Highways Lor. -M. 203/2013. This study investigated the modified compaction, unconfined compression, and workability tests. Three proportions of recycled asphalt concrete and recycled crushed stone, 0:100, 50:50, and 100:0, were studied. Moreover, the bagasse ash content in this study was varied from 5, 10, 15, 20, and 25% and catalyzed the reaction by using Sodium hydroxide mixed with sodium silicate hydrate at a ratio of 50:50. Three concentrations of Sodium hydroxide solutions were studied, which were 8, 10, and 12 molars. The samples were cured for seven days before testing. The compaction results showed that the maximum dry density decreased with an increase in bagasse ash. Nevertheless, the optimum alkaline liquid content increased with an increase in bagasse ash. The unconfined compressive strength significantly increased with NaOH concentration.