Correlation between CBR Values and Index Properties of Soils: A Case Study of Oman

Pavement materials have developed significantly through many stages until they have reached what they are now. Despite the fact that there are many samples found in Oman which are not used or neglected, there are lots of natural samples can be depleted because of its huge use like the natural materials. Basically, the frequent’ use has a negative impact on nature. Accordingly, this study is going to shed lights on some considered samples that exist but are not used called waste products under some justifications and tests of particular samples classified as coarse-grained soil (coastal material, waste brick construction, desert sand) through some methodologies: Grain Sieve Analysis, Atterberg Limit Test, Clay Content Test, Proctor Compaction Test, and California Bearing Ratio test. The mechanical properties of these samples are tested to evaluate their efficiency and effectiveness in the paving layers. The most important parameter used in the evaluation process is the CBR and the sieve analysis. As a final result, it turns out that most of the samples are not complied with Oman's specifications for subbase and base use but some materials like Khour Al-Hamam can be modified using additive materials to be suitable.