STRENGTH AND VOLUME CHANGE CHARACTERISTICS OF CEPU CLAY

• Main Author: Supriyono
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/2714
• Institution: Institut Teknologi Bandung

STRENGTH AND VOLUME CHANGE CHARACTERISTICS OF CEPU CLAY, Supriyono, 1987, Program Sistem dan Teknik Jalar, Raya, Fakultas Pasca Sarjana, Institut Teknologi Bandung. This thesis describes a study of the strength and swell characteristics of a clay soil taken from the Cepu-Bojonegoro region of East Java. Over the years, structures built on this material have suffered extensive damage due to volume changes in the foundation associated with change of season. The present study was concerned primarily with an evaluation of material characteristics associated with pavement deterioration. Samples taken at three locations were subjected to a wide range of tests in the laboratory. These included standard classification tests, determination of dry density-moisture relationships at two compactive efforts and investigation of swell and strength characteristics over a range of moulding moisture contents and surcharge levels at two compactive efforts. The influence of compactive effort and moulding moisture content on the development of swell pressure was also investigated <br /> The results of the investigation indicate that this material possesses very low strength, has high swell potential and is totally inadequate as a pavement foundation. Soaked CBR value increased with moulding moisture content to a peak value which, at both compactive efforts investigated, increased with surcharge level. At any surcharge level, the higher compactive effort resulted in higher peak CBR value. The maximum value of soaked CBR recorded in the investigation was less than 1.8 percent. Percentage swell was found to be a function of moulding moisture content, compactive effort and surcharge level. Values recorded ranged from 25 percent (at 21 percent moulding moisture content, modified Proctor compaction and 0.019 kg/cm2 surcharge) to 6 percent (at 37.8 percent moulding moisture content, standard Proctor compaction and 0.056 kg/cm2 surcharge). Higher compactive effort resulted in the development of higher swell pressure which was found to decrease with increase in moulding moisture content. Swell pressure recorded ranged from about 3.7 kg/cm2 to 0.5 kg/cm2. Methods of stabilizing moisture content in the zone subject to seasonal fluctuation are briefly discussed.