DEVELOPMENT AND INTER-LABORATORY TRIAL OF THE RILEM AAR-5 RAPID PRELIMINARY SCREENING TEST FOR CARBONATE AGGREGATES

摘要

Some alkali-reactive carbonate aggregates (like the Canadian alkali-carbonate-reactive reference aggregate from the Pittsburg quarry, Kingston) may pass as innocuous, if the ultra-accelerated mortar bar test is used as a screening test. The potential reactivity of such aggregates becomes evident, however, if the bars are made with 4/8 mm aggregate instead of 0/4 mm aggregate. RILEM TC 191-ARP has developed a corresponding method of test (AAR-5) which is based upon the Chinese accelerated concrete microbar test developed by the Nanjing University of Chemical Technology.