Influence of particle shape and void ratio on base stability : a report
Degree GrantorUniversity of Canterbury
Degree NameMaster of Engineering
In this investigations, the effects of particle shape and gradation on the performance of unbound granular pavements were examined. The test was carried out on full scale road structures at the Canterbury Accelerated Pavement Testing Indoor Facility (CAPTIF). Rounded and angular aggregates with different gradations were tested as a basecourse layer in flexible pavements for which suitable subgrade was provided and the subbases were excluded. Density, moisture content, and sieve analysis tests were carried out before and after the experiment. Deflections and vertical deformations were measured frequently after specified intervals of loading. Performance was evaluated by comparing compactive effort, deflections and vertical deformations. The cohesiveness of fines and blending of materials were found to be important factors. Particle shape has relatively greater influence on the performance than the aggregates' gradation.