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Concrete In Australia : September 2008
LIBRARY LATEST TITLES Concrete Institute members are welcome to use the Cement Concrete and Aggregates Australia’s library services. The library is located at the CCAA’s Sydney offi ce on Level 6, 504 Pacifi c Highway, St Leonards, NSW. The databases can be accessed electronically via www.concrete.net.au. The postal address is Locked Bag 2010, St Leonards, NSW 1590. Phone (02) 9903 7721, fax (02) 9437 9473, email: email@example.com CORROSION; FLY ASH Flyash reactivity as a glass corrosion topic. Accession number: 08A0226rrrr 12th International Congress on the chemistry of cement, Montreal, Canada, 8-13 July 2007 In order to achieve the goal of ultra high performance concrete, which involves the addition of fl yash, a better understanding is needed of the fundamental properties and reactivity of the glassy phase in fl yash. The theory of the chemical durability of glass can provide a fundamental understanding in terms of the infl uence of chemical composition on the polymerisation and aluminum saturation of the fl yash glass. This can serve as the basis for a more rigorous classifi cation system for flyash. DURABILITY; FIBRE REINFORCED CONCRETE; HIGH STRENGTH CONCRETE Durability and microstructure of 200N/mm2 grade ultra-high strength fi bre reinforced concrete Ashida M, Watanabe Y, Yoshino R, Suhara K 12th international congress on the chemistry of cement, Montreal, Canada, 8-13 July 2007 Accession number: 08A0226jj Resulting from investigation about durability of ultra-high- strength fi bre-reinforced concrete (UFC) of 200N/mm2 grade using high strength additives with ettringite generation (AFT) system, it became clear that the diffusion coeffi cient of its chloride ions and their gas permeability coeffi cient values were orders of magnitude smaller than conventional high strength concrete. As well, the durability of freezing-thawing cycles and resistance of alkali-silica reaction were very high. On the other hand, as for the micro structure, the total pore volume was decreased by use of AFT, and pore size distribution was shifted to smaller size and did not consolidate. CONCRETE CHEMISTRY Effects of surface improvement agent composed of lithium silicate on permeability and durability of hardened concrete Nawa T, Suzuki M, Naganuma H, Kurumisawa K 12th International Congress on the chemistry of cement, Montreal, Canada, 8-13 July 2007 Accession number: 08A0226cccc Weakened surfaces in a concrete structure readily allow damaging substances into the concrete. Surface improvement agents have been developed for applying to concrete surfaces to improve their surface properties, but most don’t reach much more than a few millimeters into the concrete. In this study, we developed a new surface improvement agent primarily composed of lithium silicate. The experimental results indicated that this agent can penetrate into conventional concrete with W/C of 0.5 about 40mm in depth, and enhances the resistance to permeability as well as resistance of concrete to diffusion of chloride ion and freeze-thaw action. ALKALI AGGREGATE REACTION Application of cathodic protection on reinforced concrete deteriorated by alkali-silica reaction Atsushi K, Koji K, Hironobu S, Toyoaki M, Takayuki K Accession number: 08A0394n 13th ICAAR, Trondheim, Norway 16-20 June 2008 A cathodic protection method was applied to specimens suffering from the combined deterioration of alkali-silica reaction (ASR) and chloride attack. The purpose of this study was to verify through experiment the effects of cathodic protection on expansion due to ASR. Specimens were deteriorated by ASR or chloride attack and ASR, by exposing specimens outdoors or immersing them in salt water for three years after fabrication. These specimens, under different curing conditions, have had a current of 1.0mA pass through them for about two years. MORTAR; THAUMASITE; SULPHATE ATTACK Resistance of mortar to thaumasite form of sulfate attack Accession number: 08A0226aa 12th International Congress on the chemistry of cement: Montreal, Canada, 8-13 July 2007 Mortar prisms made with different cements or mineral admixtures, plus 30% mass of limestone fi ller, were stored in 2% magnesium sulfate solution for one year and their visual appearance and strength development were measured at intervals. The formation of thaumasite was checked and confi rmed. The results show that the relative resistance to thaumasite form of sulphate attack of the cements is from best to worst: sulphoaluminate cement, sulfate resisting Portland cement and ordinary Portland cement. The resistance to thaumasite form of sulfate attack of mortar is remarkably improved by the addition of silica fume or ground granulated blastfurnace slag (SL). Concrete in Australia Vol 34 No 3 59