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This research presents the relationship of stiffness and California Bearing Ratio (CBR) for the compacted soil. The stiffness is focused to the form of Elastic Modulus. The tested materials were collected from highway construction. The tested results were analyzed for both soils compacted in the field and in the test box. The testing apparatus were employed by Soil Stiffness Gauge (SSG), Dynamic Cone Penetrometer (DCP) and Nuclear Density Gauge (NDG). The compacted soil in test boxes were controlled by energy of compaction and moisture content. The area of test box in this study was 0.60 x 0.60 square meter and 0.25 meter in height. The results showed that the deviation of dry density by NDG, the stiffness (K) by SSG, DPI by DCP, and CBR could be reduced for test box, comparing to soil test in the field. This outcome indicated that controlling soil properties, moisture content and compaction could reduce the deviation of test results. Considering to the soil test results applied by both SSG and DCP in the test box and in the field, the relationships between parameters of test results from these apparatuses were shown significantly. The trend of directly correlations are proposed as; in the field test, KSSG = -2.67DPI + 26.92 and in the test box also indicated KSSG = -2.67DPI + 51.64. The relationships between Field CBR and DCP operated in test box for all selected materials could be exhibited as; CBRfield(box) = 1.82CBRDCP. From this study, the apparatuses of SSG, DCP and NDG exhibited the potential to develop for compaction control in highway construction.
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Faculty of Engineering and Technology
Mahanakorn University of Technology
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