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Ahmad Shayan, Robert J. Wark and John Waters

The Canning Dam concrete gravity structure located in Western Australia has shown an upward movement of 18.3 mm and lateral upstream movement of 14.2 mm over the past 15 years of monitoring. These movements have been associated with considerable cracking of the upper parts of the dam and the upper gallery. Investigations have shown that the cause of the cracking was a strong alkali-aggregate reaction (AAR) in the concrete, brought about by a deformed granitic rock. Extensive horizontal and vertical cracking in the upper part of the dam wall has necessitated the removal of the section above the floor of the upper gallery level, and construction of a new reinforced concrete section to act as head beam for post-tensioning of the rest of the dam wall.

A set of small diameter cores were taken from the various parts for diagnostic purposes, and a vertical core of 100 mm diameter was taken through the whole thickness of the wall for the determination of the strength properties, alkali content and residual expansion potential. Based on these, a post-tensioning stress of 1.5-2.0 MPa has been calculated for restraining the residual expansion of the concrete. The spillway bridge structure which is part of the dam wall has also shown mild signs of deterioration. The piers and abutment walls and the deck were surveyed for corrosion activity and extent of AAR. This work showed that the spillway bridge structure was sound and only needed maintenance. The performance of a triple blend concrete mix containing a high volume of fly ash (45%) and silica fume (5%) developed for the replacement of the old concrete is also discussed.

Now showing 1–12 of 29 search results:

  • $15.00
    1999  Papers

    1999 – Investigations on Canning Dam Concrete Gravity Structure and it’s Rehabilitation

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    2014  Papers

    2014 – Oaky River Dam Failure

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  • $15.00
    2015  Papers

    2015 – An analysis of dam safety incidents in Victoria

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  • $15.00
    2015  Papers

    2015 – Remedial works to reduce seepage under Visegrad HPP dam

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    2016  Papers

    2016 – Hedges Dam – Upstream Face Slip from Rapid Drawdown and Subsequent Remedial Works

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    2017  Papers

    2017 – Hardfill Dams and Geomembrane Facings

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    2017  Papers

    2017 – Ridge Park Dam: An Innovative Design for an Urban Setting

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  • $15.00
    2017  Papers

    2017 – The Hampstead Heath Scheme in Central London: a Headache!

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    2019  Papers

    2019 – Design of Rockfill Embankments for Overtopping During Construction

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    2014  Papers

    2014 – The Appropriate Small Dam and Hydropower Project – Appropriate Hydropower Civil Design for Developing Countries

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    2013  Papers

    2013 – Challenges and lessons learnt from high-risk dam construction projects

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    2013  Papers

    2013 – Managing the risk of under-designed spillway training walls: an owner’s guide

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  • $15.00
    2013  Papers

    2013 – Case studies of foundation grouting using the GIN method at the enlarged Cotter Dam

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  • $15.00
    2013  Papers

    2013 – Cotter Dam construction challenges and innovations

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    2007  Papers

    2007 – Wave seiching and run-up effects in Lake Aviemore due to seismotectonic displacement of the lakebed

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    2012  Papers

    2012 – Enlarged Cotter Dam Diversion Gate Design – The Challenge and the Test

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