In recent years, newly constructed curbs on New Hampshire Department of Transportation (NHDOT) single-span roadway bridges have suffered from early-age cracking. This study focuses on the survey and analysis of data collected at several bridges in an effort to find ways to reduce cracking in bridge curbs. Seventeen existing bridges that had been placed in the past eleven years, in addition to eight bridges placed during the study, were examined for curb cracking. Eight of the bridges had variables applied to one of the curbs to try and identify which items could contribute to crack reduction. Results indicate that longer bridges experience a greater amount of cracking per foot than shorter bridges. There is also a relationship between the amount of cracking and location on the curb relative to the ends of the curb. Outcomes of this research recommend practice and specification changes to longer wet cure durations and lower cementitious content PCC mixes to reduce curb cracking.
A general hydration model for cementitious materials and a model to predict the temperature gain in hardening concrete is developed and calibrated. A ...
A major field study and evaluation has been conducted into the effectiveness of three structural overlay types for portland cement concrete (PCC) pave...
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United States Department of Transportation
[PDF-4.47 MB]
