Thesis
Design and evaluation of 4.75mm mixture for thin asphalt overlay in Washington State
Washington State University
Master of Science (MS), Washington State University
2013
Handle:
https://hdl.handle.net/2376/100188
Abstract
Thin overlays with 4.75mm nominal maximum aggregate size (NMAS) mixtures are an alternative pavement preventive maintenance strategy that are becoming more popular in recent years mainly because of their cost effectiveness, ability to be placed in thin lifts, and for using screening stockpiles. Washington State is considering introducing this preventive maintenance strategy after an appropriate evaluation of all aspects of this treatment. The objective of this study was to develop mix designs and evaluate the potential of using 4.75mm NMAS thin overlays for WSDOT considering local conditions. A thorough literature review and agency survey was conducted to determine how 4.75mm NMAS thin overlay could be designed, constructed, and applied appropriately. Four mix designs were developed for high traffic volume roads using two binders (PG70-28 and PG76-28) and two gradations (coarse and medium). The design was based on packing concept to help achieve good aggregate interlock and satisfactory volumetric properties. The cracking, rutting, and moisture resistance of the mixtures were evaluated using laboratory indirect tensile test and Hamburg wheel-tracking test. It was found the PG70-28 coarse graded mixture had the best overall performance results with all mixtures showing good results. Using a life cycle cost analysis (LCCA), the 4.75mm thin overlay was compared to traditional 12.5mm overlays and chip seals for cost effectiveness in Washington State. According to historical data and estimation, it was suggested that 4.75mm thin overlays be cost effective when compared to traditional overlay but not chip seals. 4.75mm thin overlays could be a viable pavement preservation strategy in Washington State. Based on the findings from this study, a draft special provision was also created to assist WSDOT in implementing this mix type into their preventive maintenance program.
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Details
- Title
- Design and evaluation of 4.75mm mixture for thin asphalt overlay in Washington State
- Creators
- Logan Cantrell
- Contributors
- Shihui Shen (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900524876101842
- Language
- English
- Resource Type
- Thesis