The Use of Lime to Stabilize Granular Volcanic Ash Materials for Road Construction

Title in English: 
The Use of Lime to Stabilize Granular Volcanic Ash Materials for Road Construction
Abstract in English: 
The low density, the cohesion-less nature, high percentage of voids, and other undesirable properties of volcanic ash materials in their natural state necessitate their improvement prior to any construction. This study was conducted on natural volcanic ash in order to assess the performance of lime-stabilized mixture (lime-volcanic ash and fine materials). The volcanic ash was mixed with two different types of fine soils individually to improve the grading of the volcanic ash, cohesion properties and to reduce the amount of required lime. Different variables influencing the performances of ash-soil-lime mixture were studied. These variables included water content, lime content, fine soil plasticity, soil content, and curing duration. The laboratory program adopted in this investigation includes material characterization, compaction, deformation properties and strength. Strength characteristics using unconfined compressive strength were studied and recommended values of lime content for specified conditions of road bases and sub-bases are presented in this paper.