Sharif University of TechnologyScientia Iranica1026-309824120170201Assessment of change in acoustic wave velocity of compacted expansive soil through experimentsAssessment of change in acoustic wave velocity of compacted expansive soil through experiments136142238310.24200/sci.2017.2383ENBing-xuWeiSchool of Highway Engineering, ChangSha Univ. of Science and Technology, Wanjiali South Road 960,. Changsha, Hunan 410004, ChinaZhenHuangSchool of Highway Engineering, ChangSha Univ. of Science and Technology, Wanjiali South Road 960,. Changsha, Hunan 4100040000-0003-2026-5893Journal Article20161226In the present study, the non-metal acoustic waves monitor, TH204 has been used to determine P-wave velocity of compacted expansive soil under the condition of drying-wetting cycles with constant amplitude, to explore the change in P-wave velocity of compacted expansive soil with the cyclic number, cyclic amplitude and control moisture content. The results show that the P-wave velocity of the compacted expansive soil follows a non-linear decrease with increasing the cyclic number and tends to be stable. Also, under the conditions of equivalent control moisture rate and cyclic number, the cyclic amplitude has a great effect on the P-wave velocity of expansive soil. Thus, with increase in the cyclic amplitude, the P-wave velocity is decreased. Secondly, under the same cyclic number, the P-wave velocity changes with the control moisture rate monotonously. Further, the study shows that the peak values of P-wave velocity appear near the optimum moisture rate, and the peak value position remains unaltered with change in cyclic amplitudehttp://scientiairanica.sharif.edu/article_2383_bbec2c5fd588d44d2474d9d392f17002.pdf