Implementation of Concrete Overlay Evaluation and Design
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2023-07-01
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Alternative Title:Implementation of CRCP Overlay on CPCD [Project title from cover]
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Edition:September 2019-August 2023
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Abstract:The performance of 7-in CRCP overlay on CPCD in US 75 in Sherman, which was built in 2010, has been quite satisfactory. Encouraged by the satisfactory performance of the project, TxDOT Paris District decided to build another CRCP overlay on CPCD in US 82 in Paris. This project is in the westbound direction of US 82 – consisting of 2 main lanes and asphalt shoulders for both inside and outside – from Kiamichi Railroad to FM 79, approximately 0.9 miles. The structural evaluation of the existing 9-in CPCD was conducted in November 2019, and the construction of 5-in CRCP overlay started in May 2023. The construction of overlay in the outside lane started on May 30, 2023, and the inside lane construction started late August of 2023. Temperature profiling indicated a significant insulating effect of the CRCP overlay, reducing temperature variations and joint movements in the CPCD layer. Key findings included (1) good bonding between CRCP and CPCD interface when concrete with reasonable workability was placed, while quite poor bonding when concrete with excessive slump was placed, (2) considerable reduction in slab deflections by placing 5-in CRCP overlay, and (3) significant level of reflection cracking in CRCP at existing transverse contraction joints. For various reasons, the variability in construction operations and concrete material properties was larger than expected and is reflected in the early behavior of CRCP overlay. At this point, it is not known whether the large variability in materials and construction and resulting early-age behavior will have appreciable effects on long-term performance. The performance of this section will be monitored in the TxDOT rigid pavement research project (0-7147).
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