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The Department of Highways of Thailand has used cement stabilized materials as road base and subbase for more than 30 years. However, the quality control index of the construction is only undertaken by measuring Unconfined Compressive Strength (UCS) of materials after 7 days of curing. As the UCS test is a destructive and time-consuming method, this study sought to evaluate the use of using seismic waves to inspect material quality as a nondestructive and less time-consuming method which may serve as a basis for the establishment of a new quality control index using shear wave velocity (VS) measured from Free-Free Resonance (FFR) tests. Four types (360 samples) of cement stabilized materials including soil cement subbase, soil cement base, cement modified crushed rock base, and pavement recycling with cement ratios of 1, 3 and 5% by weight were tested. The results indicated that VS increased nonlinearly with increasing UCS and also increased with increasing cement ratio for all materials. Moreover, at the same cement ratio, the VS and the UCS of cemented crushed rock base and pavement recycling were higher than soil cement materials because the first two materials had lower amounts of fine content. Quality controlled shear wave velocities were also calculated by doing a back analysis of developed VS-UCS empirical equations, and were 536, 970, 1033 and 1095 m/sec for constructions of soil cement subbase, soil cement base, cement modified crushed rock base, and pavement recycling, respectively.

Development of a Quality Control Index of Cement Stabilized Road Structures Using Shear Wave Velocity