NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Materials;
Abstract:
With the Missouri Department of Transportation (MoDOT) beginning to implement the new Mechanistic-Empirical (M-E) Design Guide for New and Rehabilitated Pavements, the need exists for various types of testing of hot-mix asphalt (HMA) mixes used by MoDOT in its flexible pavements. In particular, the American Association of State Highway and Transportation Officials (AASHTO) test protocol T 322 is utilized to determine HMA properties needed as inputs to pavement distress prediction modelswithin the M-E Pavement Design Guide (MEPDG) Software. The primary properties derived from T 322 are creep compliance and tensile strength. These properties are determined using indirect tension methods and are temperature dependent. Creep compliance is a parameter used in the thermal cracking distress model within the MEPDG Software and is determined at 0, -10, and -20°C while tensile strength is an input to the fatigue cracking distress model and is determined at temperatures ranging from -20 to +20°C.
The scope of the study is to evaluate the laboratory performance of two asphalt mixtures; one modified with SBS polymer and the second modified with a...
Traditionally run at one test temperature (122°F), theHamburg wheel tracking test (HWTT) (Figure 1) has aproven history of successfully identifying a...
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United States Department of Transportation
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