01628587

Component

Moisture damage in asphalt concrete mixtures can be evaluated through several laboratory tests, many of which compare the results of conditioned specimens to those of dry specimens. While the results from ratios of conditioned to unconditioned specimens may provide an adequate pass/fail criteria, a more comprehensive evaluation of mixture performance should include the specific values obtained (tensile strength, dynamic modulus or flow number), as these are also related to pavement performance. The objective of this study was to provide a comprehensive evaluation of the moisture susceptibility of different asphalt mixtures through principal component and clustering analysis. Twelve mixtures were designed and produced in the laboratory using a single aggregate source for nominal maximum aggregate sizes of 9.5 mm and 12.5 mm. Each of the sizes included a control mix, a styrene butadiene styrene (SBS) modified mix, mixtures that contained antistripping agents (liquid antistrip or hydrated lime), and mixtures that combined both SBS and antistripping agents. All mixtures used the same PG 70-22 binder source. Results from the Modified Lottman Indirect Tension Test Procedure, dynamic modulus and flow number tests for conditioned and unconditioned specimens were used as inputs for the analysis. The analysis indicated that principal components can be used to explain the variation in the results and to calculate an overall performance score to rank the mixtures based on selected variables. Cluster analysis was used to group mixes and to identify characteristics that affect their performance. It was found that mixtures that combined SBS and an antistripping agent ranked highest in overall performance.

This paper was sponsored by TRB committee AFK40 Standing Committee on Surface Requirements of Asphalt Mixtures. Alternate title: Principal Component and Clustering Analysis in Moisture Damage Evaluation of HMA.

01618707

17-01582

English

12p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; References; Tables

Antistrip additives; Asphalt mixtures; Cluster analysis; Dynamic modulus of elasticity; Hot mix asphalt; Moisture damage; Styrene butadiene styrene

Flow number test; Indirect tension test; Moisture susceptibility; Principal component analysis

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2017 Paper #17-01582

TRIS, TRB, ATRI

Dec 8 2016 10:32AM