The Correlation between CBR (California Bearing Ratio) and UCS (Unconfined Compression Strength) Laterite Soils in Palangka Raya as Heap Material

Abstract

In road construction activities, the use of soil as heap material is commonly practiced. Soils are heaping above soft soils aiming to increase the carrying capacity of the soft soils layer. The parameters for reference are the CBR (California Bearing Ratio) and UCS (Unconfined Compression Strength) scores. But, the test of CBR and UCS takes a long time in the process. Therefore, an approach is needed to obtain the score of CBR and UCS. Then by find out one of the parameters score, will also find out the others parameter scores. Aim to obtain the correlation between CBR and UCS scores, firstly, need to perform test in laboratory. The test conducted to soil samples from Tangkiling village, Bukit Batu district, Palangka Raya City, Central Kalimantan Province. The results showed that the correlation between UCS and CBR scores were, UCS = 0.2416, CBR - 1.2389, with R score was 0.9193. This data showed a very high correlation between UCS and CBR.