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lzjketty(½ð±Ò+25, ·ÒëEPI+1): 2011-01-22 08:25:12
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At the end of the experiment emptying the water slowly until the sand simples look dry, then take sampling from the layer .The framework of the 15x15cm is laid six or seven along the way,and the thickness laid is 2 times median diameter of the initial bed material . (A large number of experiments show that the initial coarsening of bed thickness of 2 times the median diameter), amount of melted paraffin poured in box uniformly , removed the frame from the bed after paraffin is cooled , took out the test sand , put it in a diameter 10cm and height 10cm container(The upper and lower of the container is made with 0.05mm diameter lead wire and surrounded by white tin) , poured 20ml(ÍÂÎÂ80»òÈé°ÙÁé) into the container and laid it into water ,and boiled for 20 minutes each for water . Generally the paraffin was separated from the test sand after 4-5 times of water replacements and the sepatation didn¡¯t change the grading of sand. |
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