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Concrete In Australia : December 2014
6 Concrete in Australia Vol 40 No 4 NEWS DR AS 5100.5 improved durability design In this summary of a more detailed article still to be published, Linda Lee lists the key aspects of changes that are currently included in the Draft of the new AS 5100.5 . DR AS 5100.5 was published in January 2014 by Standards Australia for public comment. The Concrete Institute of Australia’s Reference Group BD-090 -05 members contributed to the development of the amended durability requirements in Section 4 of this Draft Australian Standard, which applies to concrete bridges and related structures with a 100 year design life. The CIA also provided Standards Australia with a submission, prepared by the Reference Group, as part of the public comments process, requesting further amendments. DR AS 5100.5 Summary of Significant Amendments 4.1 General – A more onerous definition of “design life” now requires 100 years with only “minimal” maintenance. 4.2 Method of design for durability – New durability design tasks are included. Refer below 4.3 Exposure classification – Water environments now include separate water and marine categories, with altered criteria and definitions, including a new brackish water category. A new sulfate soil category has been added. Exposure classification C is now divided into C1 and C2. New curing requirements are nominated. 4.4 Requirements for concrete in exposure classifications A, B1, B2, C1 and C2 – Inclusion of separate exposure classifications C1 and C2; Limits (maxima and minima) are included for proportions of Portland cement and supplementary cementitious materials, fly ash, slag and amorphous silica; limits included for the minimum cement material content and maximum water/ cement (W/C) ratio and minimum curing requirements nominated (moist curing, membrane curing, polyethylene sheet, formwork retention, accelerated curing. Concrete must be protected from moisture loss prior to curing. Minimum 14 days curing is required for exposure classifications C1 and C2. A possible requirement for penetrability or absorption testing is noted. 4.5 Requirements or Concrete for Exposure Classification U – Nominated topics to be considered by the designer are increased to include mix proportions, methods of placement and curing. 4.6 Abrasion – New category of combined pedestrian / cycleways subject to pneumatic tyre traffic. The minimum concrete grades for pavements and bridge decks have been increased. 4.7 Freezing and thawing – The minimum concrete grades have been increased. 4.8 New Clause: Concrete structures in aggressive soils – Applies to soils with any sulfate content or any pH value, and to soils where groundwater has any chloride content or any pH value. Some aggressive exposure conditions continue to have exposure classification U. Gold Members 06-07 - Gold-Announce.indd 6 06-07 - Gold-Announce.indd 6 21/10/14 12:03 PM 21/10/14 12:03 PM