Water Transmission Properties of an Asphalt Barrier1
- J. P. Palta,
- G. R. Blake and
- D. A. Farrell2
The water transmission properties of an asphalt barrier were studied using samples taken from a barrier formed in Zimmerman fine sand. Steady flow experiments using a 9.0-cm diameter soil column showed that water movement through the barrier was affected by the capillary potentials on both sides of the barrier if these potentials exceeded a critical value or ‘break point’ which ranged from −32 to −20 cm depending on the flow rate. When the potential below the barrier dropped below the critical value, the potential above the barrier remained relatively unchanged. This steady value increased from −4.3 to −1.5 cm when the flow rate was increased from 0.009 to 0.058 cm/hour. The hysteretic flow properties of the barrier are explained using a model based on the following assumptions: (i) flow occurs mainly through cracks of varying width, and (ii) the ratio of the draining to wetting potentials of the cracks exceeds unity and is independent of crack size.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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