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原文传递 PRIMARY RESULTS FOR THE FIRST TEXAS MOBILE LOAD SIMULATOR TEST PAD.

题名：	PRIMARY RESULTS FOR THE FIRST TEXAS MOBILE LOAD SIMULATOR TEST PAD.
作者：	Chen-D-H; Fults-K; Murphy-M
关键词：	TEXAS-MOBILE-LOAD-SIMULATOR; REPETITIVE-LOADING; AXLE-LOADS; NONDESTRUCTIVE-TESTING; PRESSURE-CELLS; STRAIN-GAGES; DEFLECTOMETER-; MONITORING-; PAVEMENT-CONDITION; PAVEMENT-DISTRESS; DEFORMATION-; RUTTING-; PAVEMENT-CRACKING; NUCLEAR-MOISTURE-DENSITY-DETERMINATIONS; BASE-COURSES; SUBGRADES-
摘要：	The pavement behavior under 630,000 axle repetitions from the Texas Mobile Load Simulator (TxMLS) was studied. During the course of TxMLS testing, nondestructive testing and in situ instrumentation (pressure cell, strain gauge, and multidepth deflectometers) were applied to monitor and assess the pavement condition. In addition, pavement distress data, such as measurements of permanent deformation, rutting, and cracking, were collected and analyzed. At the end of 630,000 axle repetitions, the maximum permanent deformation was approximately 22 mm. A forensic study was then performed by cutting a 1.8-m by 3-m trench in the middle of the test pad and three nuclear density gauge (NDG) tests were performed on top of each layer to determine the densities and moisture contents. It was found that the lime-treated gravel base (LTB) layer contributed the most to rutting. The axle-load applications increased the density of the LTB layer in the pit area, which caused the pavement structure to settle and consolidate. The highest rate of rutting was observed at the early stages of loading, between 10,000 and 20,000 axle repetitions. The higher deflections on the left wheelpath as observed from falling weight deflectometer data were probably due to the higher moisture content and the instrumented pit. NDG data showed that the LTB, lime-stabilized subgrade (LTS), and subgrade in the left wheelpath all had higher moisture contents than those in the right wheelpath.
总页数：	Transportation Research Record. 1997. (1570) pp30-38 (7 Fig., 3 Tab., 7 Ref.)
报告类型：	科技报告