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原文传递 Full-Scale Tests on Rubblized Pavement Test Items at the National Airport Pavement Test Facility. Technical note.

题名：	Full-Scale Tests on Rubblized Pavement Test Items at the National Airport Pavement Test Facility. Technical note.
作者：	Garg-N.
关键词：	Pavement-testing; Rubblization-; Fracturing-; Concrete-pavement.;Airport-pavements.
摘要：	Rubblization is defined as the process of fracturing existing concrete pavement in-place into smaller interconnected pieces. Rubblization breaks the slab action and minimizes or prevents the occurrence of reflective cracks in the asphalt concrete overlay. This is the first study conducted on the full-scale accelerated pavement testing of rubblized concrete pavements with hot-mix asphalt overlay under heavy aircraft loading. Full-scale traffic tests were completed on three rubblized and nonrubblized rigid airport pavements overlaid with 5 inches of hot-mix asphalt at the Federal Aviation Administration National Airport Pavement Test Facility. Initially, the overlaid pavements were trafficked with a four-wheel landing gear (with wander) and a 55,000-lb wheel load. No significant distresses were observed during the first 5000 passes. The wheel load was then increased to 65,000 lb and a six-wheel landing gear was used. Test item MRC (rubblized concrete pavement on conventional base) exhibited complete structural failure. Test item MRG (rubblized concrete on grade) was suffering severe structural deterioration at the end of trafficking but retained sufficient structural capacity to support the applied load. Test item MRS (rubblized concrete over econocrete base) did not exhibit severe structural deterioration at the end of trafficking. Four trenches were excavated perpendicular to the centerline of the test items to conduct posttraffic investigation into the failure mechanism of the pavement structure. The trenching included tests for layer characterization (plate load tests, California Bearing Ratio tests, in situ densities, moisture contents, layer profile measurements, and visual evaluations) and removal of each of the pavement layers to reveal the subgrade interface and subsequent subgrade layers below. This report summarizes the results from pavement layer characterization tests, pavement structure uniformity from heavy-weight deflectometer tests, pavement performance during the traffic tests, changes in the modulus of the rubblized concrete layer with deterioration in pavement structure backcalculated using BAKFAA. The report also summarizes the results from the posttraffic tests and provides some insight into the failure mechanism of rubblized concrete airport pavements.
报告类型：	科技报告