AASHTO T 379-18

AASHTO T 379-18 Standard Method of Test for Nonlinear Impact Resonance Acoustic Spectroscopy (NIRAS) for Concrete Specimens with Damage from the Alkali?Silica Reaction (ASR)

standard by American Association of State and Highway Transportation Officials, 2018

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AASHTO T 379-18 covers determination of material nonlinearity in concrete laboratory specimensprepared in a manner and subjected to conditions of accelerated alkali-reactivity of aggregate. It isassumed that the nonlinearity due to elastic hysteresis is a dominant mechanism for the materialnonlinearity in concrete specimens with alkali-silica reaction (ASR) damage and that thisnonlinearity is directly proportional to the ASR damage occurring in the specimens. This methodmay not be necessarily applicable to other forms of damage.