DEVELOPMENT OF AN EMPIRICAL MODEL FOR CLAY 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 used in this research work was obtained from predetermined depths. It was first stabilized and then compacted with 0, 10, 20, 30, 40 and 50% of Reclaimed Asphalt Pavement respectively. The compaction parameters were correlated with the strength developed by 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 7.9 to 4.10% for OMC using British heavy standard. The CBR values of unsoakedsamples ranged between 11% and 19.3%. Hence, 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 sub-grade use according to the Nigerian General Specification (1997). The Model gave an excellent strength correlation R2 of 0.97.