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Show CONCRETE ROAD VIBRATIONS i Experiment Started to Determine Amount of Moisture Increase Under the Road. Does vibration caused by the movement move-ment of a vehicle over a road Increase the amount of moisture In the earth under the road, and thus weaken its bearing power? This question will be answered when results are secured fom an experiment Just Btarted by the bureau of public roads, United States Department of Agriculture. Two similar concrete slabs have been constructed con-structed side by side, and on one there will be placed a gasoline engine with an unbalanced flywheel which will cause vibration. Soil samples will be taken from under the slabs and the amounts of moisture compared. This experiment Is undertaken, not with the idea that road vibration can be pre-ventod, pre-ventod, but to determine whether sufficient suffi-cient Increase In the moisture of the subgrade is caused by it to weaken the bearing power of the soli, and Incidentally, Inci-dentally, to develop new ways of testing test-ing methods of subgrade treatment. t |