United States Department of Transportation
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Alternative Title:Technical Assistance Report 17-01TA-C
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Abstract:As part of the pavement and roadway structure investigation, LTRC Concrete Research Laboratory personnel obtained a total of seven cores in the presence of District 04 personnel in February 2017. The cores extracted showed that the longitudinal joint performed as designed, with the formation of fulldepth cracks below the saw cut. An examination of the cores over the longitudinal crack showed uniformly distributed concrete across the depth of the pavement, with no observable evidence of vibrator trails. Compressive tests showed sufficient strength concrete and soil cement. Trenching operations showed consistent concrete across the cross-section from the centerline of roadway through the outside shoulder. A crack was observed in the granular layer directly underneath the pavement crack. In the soil cement layer, a crack was found approximately 12-15 inches towards the centerline of the lane from the existing pavement crack. Falling Weight Deflectometer results indicated that all layers except the subgrade were in good condition. This supports the geotechnical findings, which indicate that the fill underlying the pavement structure is the most likely contributor to the crack. The results of the Walking Profiler indicated that some movement had occurred in the outside lane. The details of the pavement examination follow the report on the geotechnical investigation.
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