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Dynamics Testing for Alkali-Silica Reaction Diagnosis in Concrete.

SARAH MIELE, SANKARAN MAHADEVAN, KYLE NEAL

Abstract


This research is investigating a probabilistic framework for health diagnosis and prognosis of aging concrete structures in nuclear power plants. The current work focuses on degradation caused by ASR (alkali-silica reaction), which is a chemical reaction between the cement and certain aggregates containing amorphous silica – in the presence of water the ASR gel will expand causing damage to the concrete structure. Several different monitoring techniques — infrared thermography, digital image correlation (DIC), mechanical deformation measurements, nonlinear impact resonance acoustic spectroscopy (NIRAS), and vibro-acoustic modulation (VAM) —are being studied for ASR diagnosis of the specimen. This paper reports on the VAM study, which uses two simultaneous excitation frequencies; the interaction of these frequencies indicates damage through the presence of sidebands. Multiple resonant frequencies are considered along with their corresponding mode shapes. The possibility for damage localization is investigated.


DOI
10.12783/shm2017/13869

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