Ask Your Mates Open Forum

Expand all | Collapse all

Uses for dredged sea sand

  • 1.  Uses for dredged sea sand

    Posted 5 days ago
    Hi All,

    I'm wondering if anyone has found a good use for dredged sea sand?  In the City of Rockingham we have to regularly dredge ~10,000m3 to keep a boating channel open.  The sand is discoloured from organics and hence there is public resistance to spreading on the beach.  We are also in a major sea grass area and hence aren't allowed to disperse the dredged sand back into the local marine ecosystem.

    One use that I've come across from research papers is using sea sand in concrete.  It seems to be a better option if FRP is used, or for non-reinforced concrete use - does anyone have experience with this?

    Thank you

    Mike

    ------------------------------
    Michael Wilson
    City of Rockingham
    Senior Projects Officer
    ROCKINGHAM
    Australia
    ------------------------------
    Pro Cert 2


  • 2.  RE: Uses for dredged sea sand

    Posted 4 days ago
    Hi Michael,

    If the organics content isn't too high maybe you could use to fill sand bags for beach protection, artificial reef construction of even landfill daily cover ??

    ------------------------------
    Paul Bright
    Betta Roads Pty Ltd
    Director
    Perth
    Australia
    ------------------------------

    Pro Cert 2


  • 3.  RE: Uses for dredged sea sand

    Posted 4 days ago
    Hi Paul

    Thanks for your suggestions - on an ad hoc basis artificial reef and sand bags may definitely be options.  We have been working with landfill as well, however there is a finite amount that they can handle - which limit we may be reaching shortly.

    Regards

    Mike

    ------------------------------
    Michael Wilson
    City of Rockingham
    Senior Projects Officer
    ROCKINGHAM
    Australia
    ------------------------------

    Pro Cert 2


  • 4.  RE: Uses for dredged sea sand

    Posted 3 days ago
    Cover for a landfill or contaminated site possibly.

    ------------------------------
    Graham Lantzke
    Principal Asset Engineer
    WSP Pty Ltd
    graham.lantzke@wsp.com
    PERTH WA
    ------------------------------

    Pro Cert 2


  • 5.  RE: Uses for dredged sea sand

    Posted 4 days ago
    Hi Mike,

    We have been through a few dredging operations in the Whitsundays and come up against a few issues with the dredge material.
    Two small dredge operations, around 500m3 each, were able to be pumped into a geobag and disposed of once it had dried out. Due to the salt content it was classified as contaminated and we needed to find a disposal area just above the tidal zone so the salt would leach out over time once it rains. We struggled to come up with such an area so had to take the material to our landfill until we can find an alternative. The search still continues.
    Another project where we have dredged similar volumes as you a few times have approved dredge disposal areas nearby where we are able to create a basin for the material to be pumped to and allowed to settle.
    Have you had any testing carried out? The material may not be what you expect and not viable for reuse, something to consider.

    Cheers

    ------------------------------
    Michael Downing
    Whitsunday Regional Council
    Coordinator capital project delivery
    Jubilee Pocket
    Australia
    ------------------------------

    Pro Cert 2


  • 6.  RE: Uses for dredged sea sand

    Posted 3 days ago
    Hi Mike,

    Just a thought, it might be worth you contacting the Town of Port Hedland as the Spoil Bank Marina project is about to get underway and they may have encountered similar issues. Similarly, the Ocean Reef Marina Project City of Joondalup I think, may well have included a viable solution to this problem.

    Hope this helps,

    Paul 





    Pro Cert 2