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| Research on the Method of Liquid-limit and Plastic-limit Test Efficiency |
| ZHANG Hong-bin |
| The Fourth Railways Survey and Design Institute, Wuhan, Hubei 430063, China |
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Abstract Research purposes: The liquid-limit & plastic-limit test is a very important item in soil test. In the liquid-limit & plastic-limit test using the soil with lower containing water rate higher liquid-limit, the sample of soil has to marinate longer time. Now we need to find a new method to solve the above questions, to adapt the current test quantities more and more, and the time limit for a project more and more tightly condition.
Research methods: Analyzed the soil's structure characteristic and the liquid-limit & plastic-limit test characteristic, we propose to use chipper to make the improvement. And we also do considerable contrast tests for the soil with lower containing water rate higher liquid-limit.
Research results: Through the statistical contrast of the testing steps time and test results, we can see that the above method greatly shortens soil marinated time, mixture time, and then shortens the period of the test to ensure test datum all the same.
Research conclusions: Use the chipper, we can improve the efficiency of liquid-limit & plastic-limit tests that with lower containing water rate higher liquid-limit soil. And the method is very economic and useful. In the meantime, this method can debase the operators’ physical force.
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Received: 31 March 2006
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2006, Vol. 23 
