Abstract
Alkali-silica reaction (ASR) in concrete is a well-known deterioration mechanism affecting the long term durability of Danish concrete structures. Deleterious ASR cracking can be significantly reduced or prevented by limiting the total alkali content of concrete under a certain threshold limit, which in Denmark is recommended to 3 kg/m3 Na2Oeq.. However, this threshold limit does not account for the possible internal contribution of alkali to the concrete pore solution by release from aggregates or external contributions from varies sources. This study indicates that certain Danish aggregates are capable of releasing more than 0.46 kg/m3 Na2Oeq. at 13 weeks of exposure in laboratory test which may increase the risk for deleterious cracking due to an increase in alkali content in the concrete.
Original language | English |
---|---|
Publication date | 2017 |
Number of pages | 4 |
Publication status | Published - 2017 |
Event | XXIIIth Symposium on Nordic Concrete Research & Developement - Aalborg, Denmark Duration: 21 Aug 2017 → 23 Aug 2017 Conference number: 23 |
Conference
Conference | XXIIIth Symposium on Nordic Concrete Research & Developement |
---|---|
Number | 23 |
Country/Territory | Denmark |
City | Aalborg |
Period | 21/08/2017 → 23/08/2017 |
Keywords
- Alkali-silica reaction
- Aggregate
- Alkali content
- Durability