Experimental and Field Evaluation of A-6 Lateritic Soil Stabilized with Reclaimed Asphalt Pavement.

Abstract

Stability and strength are major properties investigated for materials used in road construction. Hence it is important for tests to be conducted on these materials before use. This paper evaluates the compaction characteristics and strength properties of Reclaimed Asphalt pavement mixed with lateritic soil (RAP-soil mixture) obtained from tests conducted in the laboratory and on the field. The tests were carried out on samples prepared by adding 20, 40, 50, 60, 80, 100, 120 and 140% RAP by dry weight of soil to lateritic soil and a clean sample with 0% RAP was also used as the control. The compaction test was carried out in the laboratory using the British Standard Heavy (BSH) compaction type. OMC obtained from the laboratory compaction was found to decrease from 12.3% at 0% RAP content to 6.72% at 120% RAP content. Although it further increase to 7.97% at 140% RAP content. The MDD obtained was found to increase from 2.163g/cm3 at 0% RAP to 2.252 g/cm3 at 120% RAP content after which it decreases to 2.231 g/cm3 at 140% RAP content. The optimum RAP content of 120% obtained was used for the field experimentation and in-situ density obtained was found to be 2.282 g/cm3 28 days after compaction. The CBR determined from the laboratory is 18.3%, while the value obtained on the field 2 days after compaction was 19.28%. This result yielded a strong correlation of 0.95 to validate the study’s findings