Abstract

It is very necessary for clay shale layer to slake for durability. The identification and classification of clayshale should be considered based on slope design. Several locations of clayshale slopes were stable during the construction of Cipularang Highway 97 + 000 km, West Java, Indonesia. However, they experience landslides after some time. Therefore, material properties and shear strength characteristics of clayshale layer need to be reevaluated. Laboratory test result indicated that all sample can be classified as overconsolidated –CH or indicated as A–7–6  based on the AASHTO standard. Result of triaxial test also produced significant difference of shear strength parameters of (c) dan () from bore holes. Thus, slake-durability and rate of slaking tests need to be performed. The clayshale sample can be categorized  as “slightly weathered” class and indicated as “slow rate” of weathering process.

Key words: Clayshale, slake-durability, rate of slaking.