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原文传递 Working Review of Available Non-Nuclear Equipment for Determining In-Place Density of Asphalt. Final technical rept.

题名：	Working Review of Available Non-Nuclear Equipment for Determining In-Place Density of Asphalt. Final technical rept.
作者：	FARRINGTON, S. P.; KIM, S. S.; SARGAND, S. M.
关键词：	Asphalts-; Density-; *Gauges-.;Voids-; Dielectric-permittivity; Laboratory-tests; Field-tests; Accuracy-; Aggregates-; Moisture-; Sampling-; Literature-review.
摘要：	Real time determinations that asphalt pavement density is within acceptable limits are used to assure quality in asphalt paving projects. Currently, most paving contractors determine in-place density of asphalt pavements using a nuclear density gauge, sometimes verified by the collection of core samples. Nuclear results can vary greatly relative to core samples. In addition, the nuclear method entails cumbersome health, safety, and training requirements, including certification of operators, personnel exposure monitoring, nuclear source licensing, and special procedures for storage and transport of shielded field instrumentation. Because of their relative unreliability, health risks to the operator, and the costs of complying with the special requirements of using nuclear density gauges, there is a need for more cost-effective determination of in-place asphalt pavement density. We undertook this study to characterize the performance of new non-nuclear instruments for real-time determination of in-place pavement density, so that their utility can be better predicted, and the cost-effectiveness of their use can be evaluated. Successful implementation of a non-nuclear asphalt density test method would reduce costs, as the expenses associated with nuclear gauge maintenance and training and licensing of operators will be reduced. In addition, the capital cost of non-nuclear gauges is lower than that of the nuclear gauges. The lower cost associated with the non-nuclear gauge methods will allow the paving contractor to make testing of asphalt densities a more routine part of the paving operation. Increased testing of asphalt densities will result in a higher quality pavement, allow the pavement contractors to rapidly verify that the pavement meets the specified density, reduce over-compaction of the pavement, and better optimize the paving process.
报告类型：	科技报告