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PERMEABILITY MEASUREMENT OF BASE MATERIALS USING FALLING-HEAD TEST APPARATUS.
| 题名： | PERMEABILITY MEASUREMENT OF BASE MATERIALS USING FALLING-HEAD TEST APPARATUS. |
| 作者： | Fwa-TF; Tan-SA; Chuai-CT |
| 关键词： | BASE-COURSES; PERMEABILITY-MEASUREMENT; FALLING-HEAD-TEST-APPARATUS; LABORATORY-TESTS; HYDRAULIC-GRADIENTS; TIME-SAVING-METHODS; CRUSHED-STONE; GLASS-BEADS; CEMENT-TREATED-BASES; TEST-RESULTS; VALIDATION- |
| 摘要： | The development of a new falling-head procedure for laboratory permeability measurement of pavement base materials is described. The main advantage of the falling-head test over the conventional constant-head test is its ability to determine permeability properties of the test material at different levels of hydraulic gradients in a single test. The test setup is simpler and the test duration is much shorter. Each test takes only a few minutes to complete. A large number of tests have been conducted with the proposed procedure on different materials, including compacted crushed stones, glass spheres, and cement stabilized base materials. The falling-head test results were verified by performing constant-head permeability tests on the same specimens at different hydraulic gradients. Analysis of the falling-head test data revealed that the relationship between specific discharge and hydraulic gradient over the range studied could not be represented by a single linear relationship as stated by Darcy's law. The proposed approach can be a useful tool for determining the drainage properties of base materials within the range of hydraulic gradients encountered in actual pavements. |
| 总页数： | Transportation Research Record. 1998. (1615) pp94-99 (4 Fig., 7 Tab., 7 Ref.) |
| 报告类型： | 科技报告 |
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