Accuracy Study for Predicting Compaction Parameters using Numerical Method

Abstract

The objective of this research was to study an accuracy of prediction of compaction parameters. These parameters could be read on compaction curves which constructed by numerical methods. The numerical methods used in this study were cubic spline interpolation, a third-order polynomial regression and a fourth-order polynomial regression. Lateritic soils in Prachuapkhirikhan province were provided as soil samples which divided according to materials standard for lateritic pavement of Department of Rural Roads into type A and type B. Soil grains passing a No. 4 sieve and small mold were prepared for compaction test which used compaction effort equivalent to modified compaction energy. As results, the compaction curves which constructed by cubic spline interpolation and the fourth-order polynomial regression yielded the maximum dry density close to the verified data of dry density from testing.