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Concrete In Australia : March 2008
Sulfate-resisting concrete guide Cement Concrete & Aggregates Australia (CCAA) has recently released Technical Note 68 which reports on Sulfate- resisting Concrete. The technical note discusses the mechanisms of external sulfate attack and the physio-chemical effects on concrete. It reports the outcome of a research project conducted by CCAA in which the performance of 10 Australian concrete mixes, proportioned using five sulfate- resisting cements (Type SR) complying with AS3972 Portland and blended cements were evaluated in both neutral and acidic sulfate conditions. The results were examined in relation to the long-term concrete exposure data from the US Portland Cement Association and the 40-year non-accelerated exposure program at the US Bureau of Reclamation. Current specifi cations for sulfate-resisting concrete in relevant Australian Standards and some road authorities’ specifi cations are reviewed in the context of CCAA research fi ndings which are applicable to concrete structures in sulfate or acid sulfate soil conditions. The technical note may be downloaded from the CCAA web site at www.concrete.net.au. NPCAA relocates to Adelaide The National Precast Concrete Association Australia has relocated its offi ce to Adelaide, South Australia. The contact details for the new location and executive offi cer Sarah Moore are: • Post: 6/186 Main Road, Blackwood SA 5051 • Phone: (08) 8178-0155 • Fax: (08) 8178-0355 • Email: email@example.com THE WORKS ON REO – an easy-to-navigate CD and DVD from OneSteel Reinforcing! ??????????????????? ??????? Concrete in Australia Vol 33 No 4 11 T N R G N F E N E O I I N V R C I N E G R I