- 期刊
Utilizing Asphaltic Concrete Overlay to Mitigate the Detrimental Effects of Alkali Carbonate Reactions in Portland cement Concrete Pavement
並列摘要
In 1990, the Louisiana Department of Transportation and Development (LADOTD) constructed approximately 9.96 km of portland cement concrete (PCC) pavement on Interstate 20. In 1994, the PCC began to show signs of distress in the form of surface cracks, joint spalling, pop outs, and efflorescence. Alkali carbonate reactions (ACR) in the PCC were discovered upon analyzing cores taken from the PCC in 1996. In 1997 and 1998, LADOTD placed a 102-mm AC overlay on the PCC pavement on the east- and west-bound lanes, respectively. Sawing and sealing the AC over the PCC joints was performed to mitigate reflective cracking. The AC overlay added structure to the pavement section reducing stress on the PCC, created a barrier preventing surface moisture from entering into the PCC, and created a thermally insulated pavement reducing the temperature within the PCC. Pavement surface distress data was obtained by data mining the LADOTD Pavement Management system data base and structural testing the composite pavement was conducted with the Falling Weight Deflectometer. Cores were obtained from the PCC and tested in accordance with a modified ASTM C1567-13 in October 2012. Approximately 15 years after the placement of the AC overlay, only minimal transverse cracking, longitudinal cracking, and patching were discovered and the roadway had a smooth ride. Results from the structural testing indicated that the PCC pavement was distressed with the overall structural number of the pavement being approximately 5.5. When tested in accordance with a modified ASTM C1567-13, significant volumetric strains up to 0.8 percent were measured on the PCC cores. Volumetric strains of that magnitude will cause detrimental effects on the PCC, eventually leading to its destruction.
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