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A procedure to measure the modulus and Poisson's ratio of each compacted layer shortly after placement is presented. Seismic technology has been used for this purpose. Simplified field and laboratory tests are suggested that can be performed and interpreted rapidly and nondestructively so that any problems during the construction process can be adjusted. The field and laboratory methods are incorporated in a manner that their results can be readily reconciled without any scaling or simplifying assumptions. Therefore, the laboratory tests can be used to develop the ranges of acceptable properties for a given material. Nondestructive field tests are performed to determine whether the contractor has achieved these levels. In this paper, the overall procedure and the field and laboratory devices are introduced, a procedure to establish the accuracy and repeatability of the methods is described, and several case studies are included to exhibit the preliminary uses of the procedure.
quality assurance, modulus, field testing, laboratory testing, compacted fills
Professor, Center for Highway Materials Research, The University of Texas at El Paso, El Paso, TX
Research Engineer, Center for Highway Materials Research, The University of Texas at El Paso, El Paso, TX