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Start Over Author "Ahmad Nawaz" Journal construction and building materials
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5. Repeatability, reproducibility, and sensitivity assessments of thermal and fatigue cracking acceptance criteria for asphalt cement

Author

Ahmad Nawaz Khan, Simon A.M. Hesp, Moses Akentuna, and Pan Pan

Subjects
Cement, Reproducibility, Materials science, business.industry, Phase angle, 0211 other engineering and technologies, Crack tip opening displacement, 020101 civil engineering, 02 engineering and technology, Building and Construction, Structural engineering, Repeatability, 0201 civil engineering, Acceptance testing, Asphalt, 021105 building & construction, General Materials Science, Sensitivity (control systems), business, Civil and Structural Engineering
Abstract

A total of 54 asphalt cements were recovered for pass/fail testing according to various protocols. AASHTO M 320 and proposed Glover-Rowe acceptance specifications appear permissive and lack precision. In contrast, Critical Crack Tip Opening Displacement (CTOD) and limiting phase angle temperature T(δ = 30°) are able to identify satisfactory performing binders with a high degree of repeatability, reproducibility, and sensitivity. Deficits in performance ranged from minor to severe for materials in service for only 4–5 years. A practical specification based on ductile strain tolerance and T(δ = 30°) is anticipated to provide a high degree of protection against premature and excessive thermal and fatigue cracking distress.

Published
2020
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