Date of Graduation

12-2021

Document Type

Thesis

Degree Name

Bachelor of Science in Civil Engineering

Degree Level

Undergraduate

Department

Civil Engineering

Advisor/Mentor

Braham, Andrew F.

Committee Member

Barry, Michelle L.

Second Committee Member

Casillas, Sadie

Abstract

The Dongre Workability Test (DWT) is a test for determining an asphalt pavement’s relative workability from the stress-strain curve of a sample. While the DWT has seen favorable results with warm mix and hot mix asphalt, Casillas and Braham (2020) attempted to apply this test to cold in-place recycled (CIR) asphalt pavements with limited results. This paper looked at the process of reexamining the DWT method to more favorable results with CIR samples. Phase 1 consisted of defining ten possible metrics from the stress-strain curve and applying them to samples with three different curing conditions. From these preliminary results, the five metrics that showed the greatest differences between curing conditions with small relative coefficients of variation were chosen to continue with the research. In Phase 2, these five metrics were applied to three different emulsion types at four different curing conditions (10C-30, 10C-120, 60C-30, and 60C-120). The results were plotted and analyzed to recommend the best combination for further testing. From this phase, Metrics 4 and 10, both based on different areas under the stress-strain curve, were seen to have performed the best, with higher values seeming to indicate a more workable sample. The 10C-30 and 60C-30 samples provided results with the most noticeable difference in emulsions with low relative standard deviations. Moving forward, it is recommended that these metrics be tested with other emulsions and curing conditions to see if the DWT method can be modified to be applicable to CIR asphalt pavements.

Keywords

asphalt; warm mix; hot mix; recycled asphalt; pavement; stress on asphalt

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