详情

原文传递 EVALUATION OF PREMATURE PCCP LONGITUDINAL CRACKING IN COLORADO.

题名：	EVALUATION OF PREMATURE PCCP LONGITUDINAL CRACKING IN COLORADO.
作者：	Ardani-A; Hussain-S; LaForce-R
关键词：	Colorado-; Concrete-pavements; Field-tests; Laboratory-tests; Longitudinal-cracking; Monitoring-; Pavement-cracking; Pavers-; Saw-cut-depth; Sawed-joints; Specifications-; Vibration-
摘要：	This report presents an evaluation of several portland cement concrete pavements with premature longitudinal cracking. All of the locations discussed are in Region 1 of the Colorado Department of Transportation. Included in this report is an overview of the causes of the premature longitudinal cracking, a description of field and laboratory investigations, and a list of strategies to eliminate such occurrences. Although there were some isolated cases of differential settlements related to the high swell potential (high PI/lower R-value) of the subgrade soil and/or poor subgrade compaction, this study found the shallow depth of the longitudinal saw-cuts at the shoulder joint to be the main reason for longitudinal cracking. Malfunctioning paver vibrators and unsuitable soils also contributed to the problem. The tests also proved that the wider slab design (14-ft slab) was not a contributing factor. This study resulted in two new specifications: (1) Requiring the engineer to measure saw-cut depth at intervals of 1 per 1/10 of a mile (528 ft); and (2) Requiring paving contractors to equip their paving machines with vibrator monitoring devices.
总页数：	2003/01. pp44
报告类型：	科技报告