Abstract:
Although roads or highways with soil-cement base layer show a success case for serviceability, damages have been found on some parts of the roads with time. Furthermore, the strength of all layers in the pavement structure cannot be easily evaluated and needs different ways of backcalculation process for solving this problem. This research studied the evaluation of soil-cement base stiffness using Benkelman beam and lightweight deflectometer. Full scale test sections were constructed and implemented according to different number of compaction times and dates. The test results were input data for backcalculation process based on genetic algorithm. It was found that the defection basin resulting from Benkelman beam could be improved by regression analysis, but the accuracy level was not high enough for backcalculation process resulting in over 20 percent of errors. On the other hand, the test results from lightweight deflectometer were not necessarily analyzed by regression procedure, and error occurrence could be reduced to 6 percent