ALKALI AGGREGATE REACTION IN ICELAND – NEW TEST METHODS

• Main Authors: Sóley Unnur Einarsdóttir, Børge Johannes Wigum
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Test methods; pozzolanas; volcanic Aggregates; Iceland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.616.8088; http://www.mannvit.com/media/pdf/icaar2008178einarsdottrwigumfinal.pdf

In this project, four different test methods for Alkali Aggregate Reactions were examined. For each method, eight different Icelandic aggregates were tested and in addition one of the eight aggregates was tested in all four methods with nine different cement- and pozzolanas combinations. The results show that the RILEM AAR–2 test exhibits relatively higher expansion than the other test methods. The new concrete prism tests from RILEM appear to reflect well the effects of types of aggregates, cement and pozzolanas. The mortar bar test ASTM C227 also reflects well the effect of pozzolanas, however, it exhibits very low expansion for mixes with low alkali cement. Based upon the results from this project it is considered necessary to review the current Icelandic Building Regulations. Recent results, along with continuous research will enable the development of an Icelandic national document providing guidelines for production of durable concrete regarding AAR.