Frequency Effect of Cyclic Soaking and Drying on the Resilient Modulus of Gypsum-Rich Roadbed Sand

Presented is a study of the effect of frequency of cyclic soaking and drying on the time variation of resilient modulus MR of gypsum-rich roadbed sand having a gypsum content of about 39%. Three different frequencies are adopted. The high frequency is represented by a short cycle length of 14 days, while for the low and medium frequencies, cycle lengths of 180 and 60 days were chosen. Generally, thirteen pairs of CBR specimens were prepared for each frequency and each specimen was subjected to a surcharge load of 200 N. The wave propagation technique was used to determine the MR for each CBR specimen at the beginning and end of each phase. The paper reveals that the MR decreases during the soaking phase and increases during the drying phase and the process converges to an “equilibrium state” after the fourth cycle. An increase in cycle length decreases soil stiffness.

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  • English

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  • Accession Number: 01603719
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 2016 9:35AM