In Situ Evaluation of Radioisotope Cone Penetrometers in Clays
Dasari, GR
Assistant Professor, Department of Civil Engineering, National University of Singapore, Singapore

Karthikeyan, M
Research Engineer, Department of Civil Engineering, National University of Singapore, Singapore

Tan, T
Associate Professor, Department of Civil Engineering, National University of Singapore, Singapore

Mimura, M
Associate Professor, Disaster Prevention Research Institute, Kyoto University, Japan

Phoon, K
Associate Professor, Department of Civil Engineering, National University of Singapore, Singapore

(Received 3 April 2002; accepted 7 June 2005)

Abstract
A comprehensive site investigation was performed at a $12\text{‐}\text{year}$ -old man-made island in Singapore, which was reclaimed using dredged clay lumps. The objective of the site investigation was to evaluate the performance of the radioisotope (RI) cone penetrometers to measure in situ wet density and water content, which are the two important parameters in the characterization of soils formed from clay lumps. The site investigation program included RI cone penetration tests, high quality soil sampling, and laboratory testing. The in situ water content and wet density profiles measured with RI cone penetrometers were compared with data obtained independently from the laboratory tests on undisturbed samples. The comparison shows very good agreement, and 92% of the RI cone measurements were found to be within $\pm 5\%$ of the laboratory measurements.

Keywords:
cone penetrometer, radioisotope, wet density, water content, gamma ray, neutron, site investigation

Paper ID: GTJ11380
DOI: 10.1520/GTJ11380

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Author Dasari GR, Karthikeyan M, Tan T, Mimura M, Phoon K Title In Situ Evaluation of Radioisotope Cone Penetrometers in Clays Symposium , Committee on