AASHTO TP 141-20

AASHTO TP 141-20 Provisional Standard Method of Test for Determining the Indirect Tensile Nflex Factor to Assess the Cracking Resistance of Asphalt Mixtures

standard by American Association of State and Highway Transportation Officials, 2020

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AASHTO TP 141-20 covers the determination of cracking resistance of asphalt mixtures using the indirect tensile (IDT) geometry at 25 degrees. The Toughness (area beneath the stress-estimated strain data) and Brittleness Slope (post peak stress-estimated strain rate) are used to calculate a parameter referred to as the Nflex factor, which may be a useful indicator of load-related cracking of asphalt pavement layers.