Ask Your Mates

Use of non-standard gravel for road pavements

  • 1.  Use of non-standard gravel for road pavements

    Posted 16 March 2017 19:24
      |   view attached
    At the recent IPWEAQ South-west region conference at Dalby, there was a question from the audience about the possibility of using the local materials (whatever was available) rather than trying to achieve standard specification requirements.

    Now I realise there are multiple factors to consider, but at least for sealed roads, an important criterion is the strength of the pavement.

    I have just received an invitation from a private training provider to attend a workshop on CIRCLY 6.0 pavement design software. ( I won't even suggest going because my manager cannot justify the cost of the software for our regional and financially-challenged council.)

    I remember using it around 35 years ago, when it was  a mainframe Fortran programme on the Qld Government's  central computer.  I used it to design the sealed pavement for a couple of aerodromes in remote locations, where the available gravel was well below what DTMR might require for its roads.

    Using CIRCLY would be ideal for dealing with the use of low CBR gravel.  Given its cost, it would probably be more cost-effective for most councils in this position to approach a consultant set up to carry out CIRCLY analyses.

    I have attached a retrospective paper on CIRCLY sent to me by the training provider.

    ------------------------------
    Frank Scheele
    Senior Engineer
    Kingaroy Qld
    SBRC
    ------------------------------
    BlogPageSpacerBlank


  • 2.  RE: Use of non-standard gravel for road pavements

    Posted 19 March 2017 18:57
    Look - Measure - Assess.   This is the approach that should be used in LOCAL government, alongside or in preference to 'universal' theoretical calculations.  Look: you will find your predecessors used locally available gravels.  For example, when a utility trenches across an old road have a look in the trench to see what works, or doesn't work, in the LOCAL context; particularly measure the depth and assess quality of the local gravel that was used.  Measure the traffic volume / weight using the road and the 'ability' of the road to carry this traffic. 

    Remember: most local roads prematurely fail because low quality material that was used for the upper 100mm, or so, immediately under the bitumen surfacing, rather than inadequate total pavement depth.  Always use A1 quality materials here.  

    Also, assess the local soil profiles.  For example: in Podzol soils, the upper B horizon is leaner than the lower level, = better support for your pavements.

    ------------------------------
    John Gould
    HUNTERVIEW NSW
    ------------------------------

    BlogPageSpacerBlank


  • 3.  RE: Use of non-standard gravel for road pavements

    Posted 19 March 2017 19:16
    Frank - if your regional road group recognise this software as beneficial, develop the skills in house and use it across the group - reduces the individual cost and upgrades skills win, win.

    ------------------------------
    Kevin Bickhoff
    Life, Central Queensland
    EMERALD QLD
    ------------------------------

    BlogPageSpacerBlank


  • 4.  RE: Use of non-standard gravel for road pavements

    Posted 28 June 2017 05:35
    A couple of reference documents that may be of assistance for use of non standard gravels or marginal gravels for road pavements are;

    • Austroads Guide to Pavement Technology: Part 4D Stabilisation,
    • Auststab Pavement Recycling and Stabilisation Guide
     Both of these documents are useful should you consider mechanical or chemical stabilisation to improve marginal materials.
    BlogPageSpacerBlank


  • 5.  RE: Use of non-standard gravel for road pavements

    Posted 26 June 2017 00:16
      |   view attached
    I have prepared a TECHnote that covers your topic. It may be of interest? see attachment

    ------------------------------
    Chris Edwards
    AUS-SPEC Engineer
    Sydney
    0429546190
    ------------------------------

    BlogPageSpacerBlank


  • 6.  RE: Use of non-standard gravel for road pavements

    Posted 26 June 2017 22:14
    ​In my previous ''life'' I used to work with BISAR software for analytical pavement design :)
    If I am not rusty enough, I could still give some training on it...:)
    BlogPageSpacerBlank


  • 7.  RE: Use of non-standard gravel for road pavements

    Posted 26 June 2017 22:14
    ​Thanks Chris, I have forwarded your information to our Roads & Drainage manager.

    ------------------------------
    Frank Scheele
    Senior Engineer
    Kingaroy Qld
    SBRC
    ------------------------------

    BlogPageSpacerBlank


  • 8.  RE: Use of non-standard gravel for road pavements

    Posted 26 June 2017 22:57
    Hi Mate,

    The building code of Australia allows alternative solution in order to use local in-situ gravel or even soil and achieved the result even more than the requirement.

    Typical road base material and preparation  may achieve code requirementRoad Base Application of Soilstone In engineered in-situ soil  for road base and subbase material, can be reinforced

    Edgar Arevalo Agda
    Sydney NSW

    ------------------------------
    Edgar Arevalo Agda
    Consulting Structural/Civil/Research Engineer
    RE Soilstone Pty Ltd
    Suite 1A Level 2 802-808 Pacific Highway
    Gordon NSW 2072 FAX: 02 9844 5445
    http://resoilstone.com
    ------------------------------

    BlogPageSpacerBlank


  • 9.  RE: Use of non-standard gravel for road pavements

    Posted 27 June 2017 00:35
    CIRCLY is not recommended for granular pavements with thin bituminous seals but if you want to have a play with it you can use it in evaluation mode by contacting Mincad Systems. happy to do a few scenarios for you to give you an idea

    Bob Andrews
    Unit Chair Pavement Design CPEE
    0438827432
    BlogPageSpacerBlank


  • 10.  RE: Use of non-standard gravel for road pavements

    Posted 17 September 2017 17:56
    Hi Bob,

    Are you able to point me in the direction of some literature supporting CIRCLYs unsuitability for granular pavements with thin bituminous surfacing?

    I'm going through the process with a consultant at the moment and would like some references if I'm going to open the discussion.

    Cheers,

    Sam
    BlogPageSpacerBlank


  • 11.  RE: Use of non-standard gravel for road pavements

    Posted 27 June 2017 00:36
    Soilstone  ground improvement or engineered in situ soil

    ------------------------------
    Edgar Arevalo Agda
    Consulting Structural/Civil/Research Engineer
    RE Soilstone Pty Ltd
    Suite 1A Level 2 802-808 Pacific Highway
    Gordon NSW 2072 FAX: 02 9844 5445
    http://resoilstone.
    ------------------------------

    BlogPageSpacerBlank