Development of an Empirical Model for A-6 Soil Stabilized with Reclaimed Asphalt Pavement

Abstract

A-6 lateritic clay is a weak soil, which requires some forms of stabilization and strength enhancement. The clay soil was obtained from predetermined depths. It was first compacted and then stabilized with 0, 10, 20, 30, 40 and 50% of Reclaimed Asphalt Pavement respectfully. The compaction was correlated with the strength developed by A-6 clay soil stabilised with Reclaimed Asphalt Pavement. The compaction results of clay-RAP mix ranged from 0.553 - 1.995 g/cm3 for MDD, with 7.10 - 9.90% for OMC. The CBR values of samples ranged between 11% and 19.3%. Finally, using OMC as independent variable, an empirical model, MDD = – 0.348x+3.094 was developed using Microsoft Excel 2017. The model was satisfactory for sub-grade application. Also, the CBR value of 17.2 – 19.3% is satisfactory for both subgrade and sub-base use according to General specification. The Model gave an excellent strength correlation R2 of 0.97.