United States Department of Transportation
i
Texas Demonstration Project: Continuously Reinforced Concrete Pavement on FM 1938
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2015-04-01
[PDF-2.75 MB]
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Edition:Final Report
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Abstract:As part of a national initiative sponsored by the Federal Highway Administration (FHWA) under the Highways for LIFE program, the Texas Department of Transportation (DOT) was awarded a $1,000,000 grant to demonstrate the use of proven, innovative technologies including non-woven geo-textile bond breaker between CRCP and cement-treated base, intelligent compaction of subgrade and base materials, optimized aggregate gradation for concrete pavement, improved concrete curing, texture and grooving of CRCP. This report documents deployment of innovations on the construction of FM 1938 in the cities of Southlake, Westlake and Keller, just north of Fort Worth, Texas. The project involved the construction of the new 2.6 mile freeway with six lanes from SH 114 to Dove Road and four lanes from Dove Road to Randol Mill Road. The purpose of the new roadway was to improve capacity and ease mobility on FM 1709. The construction of the FM 1938 project provided TxDOT with valuable insight to several aspects of the construction process. The use of optimized gradation showed potential cost savings through reduction in cement and pavement thickness requirements. The estimated cost savings with reduced cement requirements was about 60 cents per CY of concrete; however, the reduction in thickness could not be further reduced for this project due to the cover requirements for steel in the continuously reinforced design. The use of a non-woven fabric as a bond breaker was not considered an advantage on this project, especially given the use of continuous reinforcement. The installation was labor intensive and the use of the fabric did not result in any improved attributes. While intelligent compaction was not used under the pavement sections as originally planned, it did show promise as an evolving technology. The lithium based curing compounds were more expensive and requires additional research to determine its cost-benefits.
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