Public Roads, Vol. 20

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Excerpt from Public Roads, Vol. 20: A Journal of Highway Research, March 1939During the traffic test the water level was gradually raised until a height of 4}é inches above the top of the sub-base was reached at wheel-trips and this water elevation was maintained to a total of wheel-trips. Under these extreme conditions sections 2 and 3, because of their increased density, absorbed only and percent more moisture than they had contained at wheel-trips and section 4 actually showed a loss of percent moisture. All three sections were quite stable-throughout the test in marked contrast to their behavior from to wheel-trips when each absorbed approximately 3% percent of water and became highly unstable because of insufficient compaction.N o difficulties such as those encountered in connection with series 1 were encountered during the compaction of the materials of series 2 because, as previously stated, the original moisture contents were high enough to allow for appreciable drying during compaction. Thus compaction was able to proceed to the maximum density obtainable under traffic before the moisture content passed below the optimum.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.