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原文传递 Development of Mix Design and Structural Design Procedures for Cold In-Place Recycling.

题名：	Development of Mix Design and Structural Design Procedures for Cold In-Place Recycling.
作者：	Sebaaly, P. E.; A.Castro, J.; Ayala, F.; Carvajal, M.; Hajj, E. Y.
关键词：	Superpave design, Cold-in-place-recycling, Hveem design, Rutting, Fatigue, Structural Design Procedures, Asphalt emulsions, Recommendation, Mix design method, Nevada Department of Transportation(NDOT)
摘要：	This research effort conducted extensive evaluations of CIR mixtures in support of the development of a mix design method for CIR mixtures and a structural design method for flexible pavements with CIR layers. CIR mixtures with two gradations, two lime slurries, and four asphalt emulsions were designed using the Hveem and Superpave methods and their engineering properties and performance characteristics were evaluated. The data generated in this research showed that CIR mixtures can be effectively designed using the NDOT Hveem mix design method with some minor modifications in the number of tamps and the leveling stress. The optimum air voids content has been identified as 13±1. The moisture sensitivity evaluation of the CIR mixtures showed that CIR mixtures can be designed to deliver good levels of dry tensile strength property and tensile strength ratio. The evaluation of the dynamic modulus master curve data for the CIR mixtures indicated that the majority of CIR mixtures develop E* properties that are very comparable to AC mixtures at all levels of temperatures and frequencies. It was found that, for the NDOT standard CIR mixtures manufactured with non-graded RAP and 6.0% lime slurry, an average rutting model can be recommended with 95% confidence to estimate the rutting performance of CIR mixtures manufactured with different asphalt emulsions. The fatigue data generated up to this point showed the CIR mix with the rubber-modified emulsion has the best resistance at 70 degrees F followed by the CIR mix with the Latex-modified emulsion. However, this observation may not hold true at the other testing temperatures of 55 and 85oF. The data generated from the overlay tester showed that the resistance of the CIR mixture to reflective cracking is sensitive to the type of asphalt emulsion. The analysis of the reflective cracking data indicated that some CIR mixtures are less resistant to crack initiation but more resistant to crack propagation than others.
报告类型：	科技报告