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原文传递 DEVELOPMENT AND PRELIMINARY INVESTIGATION OF ROLLING DYNAMIC DEFLECTOMETER.

题名：	DEVELOPMENT AND PRELIMINARY INVESTIGATION OF ROLLING DYNAMIC DEFLECTOMETER.
作者：	Bay-JA; Stokoe-KH-II; Jackson-JD
关键词：	NONDESTRUCTIVE-TESTING; ROLLING-DYNAMIC-DEFLECTOMETERS; DYNAMIC-DEFLECTION-DETERMINATION; CALIBRATIONS-; TEST-METHODS; COMPARISONS-; FALLING-WEIGHT-DEFLECTOMETERS; TEST-RESULTS
摘要：	Nondestructive testing (NDT) is an important part of optimizing any pavement management system. At this time in the United States NDT is performed at discrete points on the pavement to evaluate the properties of the pavement layers. Techniques such as the falling weight deflectometer (FWD), Dynaflect, and spectral-analysis-of-surface-waves are used. A new technique is described. It is called the rolling dynamic deflectometer (RDD) and is a large truck on which a servo-hydraulic vibrator is mounted. The vibrator is used to apply large vertical dynamic loads [up to a total load of 147 kN (33,000 lb)] to rolling wheels that come into contact with the pavement. A receiver wheel located midway between the loading wheels is used to monitor the dynamic deflections. The truck is driven at a slow speed [about 5 km/hr (3 mph)], and continuous profiles of pavement flexibility are measured under heavy traffic conditions. Descriptions of the equipment, calibration results, and test procedures are presented. Several examples involving tests of flexible pavements and comparisons with FWD results are included. The results show that the RDD can be used to (a) determine uniformity along pavement sections, (b) measure differences in average flexibility between different sections, and (c) observe nonlinearities in a given pavement section.
总页数：	Transportation Research Record. 1995. (1473) pp43-54 (12 Fig., 1 Tab., 7 Ref.)
报告类型：	科技报告