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Long-term ultrasonic monitoring of concrete affected by alkali-silica reaction

Journal Article · · Structural Health Monitoring

This article presents continuous monitoring results of alkali-silica reaction (ASR) development in concrete specimens for over 400 days using ultrasonic testing and expansion measurements. Eight concrete specimens with nonreactive aggregate (Control), reactive coarse aggregate, and reactive fine aggregates were cast with two reinforced confinement conditions. The specimens were conditioned in an environmental chamber with high temperature and humidity (38°C and 90% relative humidity) to accelerate the ASR development. A multichannel ultrasonic monitoring system was developed to collect ultrasonic signals automatically, and the expansions in three directions were measured periodically. Results showed that the relative velocity change could detect the ASR initiation in all reactive specimens and show a correlation with expansion in the early stage. However, these correlations are inconsistent for different ASR specimens, and the velocity change becomes less sensitive to ASR damage in the late stage (after 300 days). Irrecoverable velocity drop was observed during every chamber shutdown period, especially in specimens with higher levels of ASR damage. This phenomenon suggests that the nonlinear ultrasonic response caused by the ambient temperature variation may indicate the ASR damage.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NE0008544
OSTI ID:
1970060
Alternate ID(s):
OSTI ID: 2580168
Journal Information:
Structural Health Monitoring, Journal Name: Structural Health Monitoring Journal Issue: 1 Vol. 23; ISSN 1475-9217
Publisher:
SAGE PublicationsCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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