Title:
Challenges with Monitoring Surface and Subsurface Changes in Concrete Due in ASR
Author(s):
Noyce
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
Alkali Silica Reactions (ASR) is a harmful long-term deterioration phenomenon for concrete structures. Monitoring and assessing ASR-affected concrete is a challenging task due to the multiscale nature of the damage propagation. The reaction starts at the elementary level by forming gels that swell and induce cracks, eventually affecting the structure's capacity. A combination of subsurface and surface monitoring techniques can provide an effective solution. A field application of coda wave interferometry (CWI) and non-contact visual technique will be discussed in this presentation. CWI monitoring utilizes the sensitivity of the Coda of repeated transmission measurements to changes in stress, temperature, moisture, as well as localized or distributed damage that should be suitable for monitoring the subsurface condition of ASR-affected concrete. The non-contact visual technique includes capturing and analyzing a sequence of photos of the area(s) of interest to identify surface-level changes in the structure. Preliminary results from implementing this methodology on a historic stadium in the United States will be presented.