Performance-Based Mix Design for Porous Friction Courses (2018) / Chapter Skim
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Pages 35-39
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35 Introduction The work plan was divided into two parts. Part 1 was to evaluate mix design parameters, performance tests, and performance criteria that can be included in a performance-based specification.
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36 Performance-Based Mix Design of Porous Friction Courses lime, the lime would be replaced by baghouse fines to maintain the total dust content. The liquid anti-strip agent used in all the mixes in this study is added to the binder at a dosage of 0.5% by weight of the binder and blended before mixing with aggregate.
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From page 37... ...
Work Plan 37 • AASHTO T 324 -- Hamburg Wheel-Track Testing, • ISSA TB 100 -- Wet Track Abrasion Test, • Tex-248-F -- Overlay Test (OT) , • AASHTO TP 108 -- Cantabro Loss, and • Illinois Test Procedure 405 -- Determining the Fracture Potential of Asphalt Mixtures Using the Illinois Flexibility Index Test (I-FIT)
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38 Performance-Based Mix Design of Porous Friction Courses an average permeability value of 66 meters/day and an average air void content of 14.3%. While this was deemed close to acceptable based on the anticipated 15% minimum air void content, it was decided that this mix was already practically optimized and was only slightly improved when 2.0% dust was added to increase durability.
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From page 39... ...
Work Plan 39 keep the binder at the appropriate temperature while blending the GTR. A high shear paddle mixer was used at a rate of 700 rpm when adding the GTR.
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