Correlations between the surface stiffness evaluated by light-weight deflectometer and degree of compaction
Conference proceedings article
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Author list: Kongkitkul W., Saisawang T., Thitithavoranan P., Kaewluan P., Posribink T.
Publisher: American Society of Civil Engineers (ASCE)
Publication year: 2014
Issue number: 242 GSP
Start page: 65
End page: 75
Number of pages: 11
ISBN: 9780784413449
ISSN: 0895-0563
eISSN: 0895-0563
Languages: English-Great Britain (EN-GB)
Abstract
For compaction works, it is necessary to spot-check the density of compacted backfill, usually by means of the sand cone test. However, this method is time-consuming. A light-weight deflectometer (LWD) developed for evaluation of surface stiffness may be employed to estimate the degree of compaction. In this study, the following tests were performed on a lateritic soil: (i) modified Proctor compaction test to determine the optimum water content (wopt) and the corresponding maximum dry density (d,max); (ii) California Bearing Ratio (CBR) tests on specimens prepared at wopt; (iii) sand cone tests to find the field density and, therefore, the degree of compaction (Dc); and (iv) LWD tests to find the surface stiffness (kLWD). While gradually increasing the compaction effort in a test pit, sand cone and LWD tests were performed on the compacted soil. It was found that there are relevant correlations between the Dc and %CBR and the kLWD. When these correlations are known, the LWD test can be an alternative for indirectly evaluating Dc and %CBR for compaction control. ฉ 2014 American Society of Civil Engineers.
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