Guidelines for Partial Depth Repair in CRCP (0-5549-P1)

0-5549-P1Over the years, the Texas Department of Transportation (TxDOT) has improved design and construction practices of Continuously Reinforced Concrete Pavement (CRCP), which has resulted in good overall performance of CRCP in Texas. At the same time, the improved design and construction practices changed the type of distresses in CRCP. Typical punchout distresses that were once prevalent and required full-depth repairs, have become rare; rather, a substantial portion of distresses observed in CRCP built with the improved design and construction practices are partial depth distress (PDD). In PDD, the distress is confined to the top half of the slab, above longitudinal steel. The concrete below the longitudinal steel, or the approximate bottom half of the slab, remains in sound condition.

In CRCP, good load transfer at transverse cracks is provided by an adequate amount of longitudinal steel and aggregate interlock, which is responsible for good performance of CRCP in Texas. On
the other hand, if load transfer is degraded or lost at transverse cracks or any transverse joints (construction joints or repair joints), CRCP performance could be severely compromised. In repairing PDD, it is strongly advisable to keep the continuity of the longitudinal steel so that a high level of load transfer is maintained at the transverse repair joints. Full-depth repair (FDR) requires cutting of longitudinal steel at the transverse repair joints and it’s difficult to restore the continuity of longitudinal steel and load transfer capability at transverse repair joints. Accordingly, partial-depth repair (PDR) should be used for the repair of PDD, because it will keep the continuity of longitudinal steel, provide a high level of load transfer at transverse repair joints, and is more cost-effective than FDR. This document provides guidelines for the evaluation of CRCP distress to determine whether a distress is PDD, and for the proper repair procedures including repair material selection. This document does not address the repair of CPCD (Concrete Pavement Contraction Design.)

Authors: Jungheum Yeon, Seongcheol Choi, Soojun Ha, and Moon C. Won

 

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