Very Preliminary test results

In TUD laboratories, we are executing accelerated performance tests –which are defined by AAR study groups of RILEM committee-. Results from these tests and analyses on the samples will be used for backward compatibility checks with cores/information from existing affected structures and ongoing studies on parameter characterisation in literature. 

Later batch of mixes will be aiming to  get the same mix as Nautesund Birdge in Oslo, Norway. This bridge was built in 1958 and demolished in 2009. ASR has been diagnosed as a part of degradation, and overall assessment of the bridge, thus final demolition decision.

Pictures from the construction of Nautesund Bridge - courtesy of Ingvar Hellestad,  (special thanks to Per Hagelia).

Polished section from 7 original cores are under preparation process. We are hoping to get comparable results early 2012.

 

Currently validations test with 4 mixes, based on Norwegian Reference concrete are running for RILEM AAR-3 @ 38° C and AAR-4 @ 60° C tests. Current mixes involve Aggregates : Ardal, Spratt and Ottersbo and cements from NORCEM Cement CEMI : Industri and Anlegg. These results will be used for the confirmation of TUD Labs testing performance. Very preliminary expansion results to follow (as of 21st Oct, 2011):