Automated Detection of Alkali-silica Reaction in Concrete using Linear Array Ultrasound Data

Conference · Sun Jan 01 04:00:00 EST 2017

OSTI ID:1356937

Santos-Villalobos, Hector J ^[1]; Clayton, Dwight A ^[1]; Ezell, N Dianne Bull ^[1]; Clayton, Joseph A ^[1]; Baba, Justin S ^[1]

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1. ORNL

Alkali-silica reaction (ASR) is a chemical reaction in either concrete or mortar between hydroxyl ions of the alkalis (sodium and potassium) from hydraulic cement (or other sources), and certain siliceous minerals present in some aggregates. The reaction product, an alkali-silica gel, is hygroscopic having a tendency to absorb water and swell, which under certain circumstances, leads to abnormal expansion and cracking of the concrete. This phenomenon affects the durability and performance of concrete structures severely since it can cause significant loss of mechanical properties. Developing reliable methods and tools that can evaluate the degree of the ASR damage in existing structures, so that informed decisions can be made toward mitigating ASR progression and damage, is important to the long term operation of nuclear power plants especially if licenses are extended beyond 60 years. This paper examines an automated method of determining the extent of ASR damage in fabricated concrete specimens.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1356937
• Country of Publication: United States
• Language: English