Correlation-Based Studies on Resilient Modulus Values for Fiber-Reinforced Lime-Blended Clay

In the design protocols of pavement subgrade layers, the resilient modulus ( M R ) property assumes importance in evaluating the performance during their life-time under sustainable repeated or dynamics traffic-loads. The aim of this study is to evaluate the improvements achieved on the subgrade layers of fiber-treated lime-blended expansive soil. Two types of fibers exhibiting different surface properties were considered and their length(s) and dosage(s) (by dry weight of soil) were varied as 6 mm and 12 mm; and 0.2% and 0.6%, respectively. To ensure bonding between fiber and soil particles, dehydrated lime has been added to the soil-fiber mixture. The compacted specimens were cured up to 28 days. Dynamic resilient modulus M R tests were carried out in the laboratory for soil–lime-fiber mixtures using dynamic triaxial device. The obtained M R values were correlated with California Bearing Ratio (CBR) and Unconfined Compression Strength (UCS) values and appropriate models have been proposed to estimate M R . The results show significant increments in M R due to fiber reinforcement and are affected by fiber type, length and dosage. The proposed models considering CBR and UCS to predict M R have shown excellent correlations.