Characterization of soil mixed with garnet waste for road shoulder

Abstract

This paper presents the findings on the characterization of soil mixed with garnet waste for road shoulder. Road shoulder at local road nowadays has insufficient compaction due to local settlement and further compaction by parked vehicles. Garnet waste is one of the industrial wastes that is getting bulkier, and thus create opportunity to reduce and reuse the waste. The research aims to determine the properties of soil and garnet waste, to determine the moisture content of materials, degree of compaction, and to propose the maximum percentage of mix proportion under California Bearing Ratio (CBR) test for road shoulder. Material properties testing involved sieve analysis and chemical composition. Compaction test in the mixed proportion of 100% soil (10S), 100% garnet waste (10G), 20% soil and 80% garnet waste (2S8G), 40% soil and 60% garnet waste (4S6G), 60% soil and 40% garnet waste (6S4G), and 80% soil and 20% garnet waste (8S2G) obtained the Optimum Moisture Content (OMC) between 8-20% and Maximum Dry Density (MDD) between 1.74-2.56 mg/m3. From the OMC desired, CBR test was conducted and the optimum value of 40% added percentage of garnet waste can be used as the mix proportion for road shoulder construction. The addition of garnet waste content tends to increase MDD and the fineness modulus also influence the degree of compaction. The results showed that garnet waste has good potential as road shoulder in the percentage of 40% and above for mixed proportion with soil. The regression value (R2) of 0.86 and 0.96 for CBR and MDD, respectively was derived to predict the real CBR and MDD during real road construction using the garnet waste content.