A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Texas Perpetual Pavements - New Design Guidelines
Since 2001, the State of Texas has been designing and constructing perpetual pavements on some of its heavily trafficked highways where the expected 20-year truck-traffic estimate of 18 kip ESALs is in excess of 30 million (TxDOT, 2001). To date, there are 10 in-service perpetual pavement (PP) sections. Based on the TxDOT initial design proposals (see Appendix A), a typical Texas PP structure consists of the following (TxDOT, 2001; Walubita et al., 2009a): (1) about 22 inches total thickness of hot-mix asphalt (HMA) layers; (2) at least 8 inches thick treated (lime or cement) base material; and (3) a well compacted in-situ subgrade soil material. In 2005, a research study was initiated to validate, among other objectives, the Texas PP design concept and make recommendations for the future design of Texas PP structures (Walubita et al., 2009a). To achieve these objectives, various research tasks were completed including the following: (1) construction monitoring and compaction quality measurements; (2) extensive laboratory testing and material property characterization; (3) traffic and response measurements for structural evaluations; (4) field testing and periodic performance evaluations; (5) comparative mix-design evaluations; and (6) computational modeling and software evaluations. Based on the findings of the study (Walubita et al., 2009a), this report documents the revised guidelines and recommendations for the future design, construction, and performance evaluation of Texas PP structures. The recommendations include guidelines for structural thickness design, design software, response criteria, mix-design, and layer moduli values.
Texas Perpetual Pavements - New Design Guidelines
Since 2001, the State of Texas has been designing and constructing perpetual pavements on some of its heavily trafficked highways where the expected 20-year truck-traffic estimate of 18 kip ESALs is in excess of 30 million (TxDOT, 2001). To date, there are 10 in-service perpetual pavement (PP) sections. Based on the TxDOT initial design proposals (see Appendix A), a typical Texas PP structure consists of the following (TxDOT, 2001; Walubita et al., 2009a): (1) about 22 inches total thickness of hot-mix asphalt (HMA) layers; (2) at least 8 inches thick treated (lime or cement) base material; and (3) a well compacted in-situ subgrade soil material. In 2005, a research study was initiated to validate, among other objectives, the Texas PP design concept and make recommendations for the future design of Texas PP structures (Walubita et al., 2009a). To achieve these objectives, various research tasks were completed including the following: (1) construction monitoring and compaction quality measurements; (2) extensive laboratory testing and material property characterization; (3) traffic and response measurements for structural evaluations; (4) field testing and periodic performance evaluations; (5) comparative mix-design evaluations; and (6) computational modeling and software evaluations. Based on the findings of the study (Walubita et al., 2009a), this report documents the revised guidelines and recommendations for the future design, construction, and performance evaluation of Texas PP structures. The recommendations include guidelines for structural thickness design, design software, response criteria, mix-design, and layer moduli values.
Texas Perpetual Pavements - New Design Guidelines
L. F. Walubita (author) / T. Scullion (author)
2010
54 pages
Report
No indication
English
Perpetual Pavements in Texas: State of the Practice
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