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  1. Speedycrete

    Dropping Concrete 5000 metres vertically

    Bring the question to: www.concretepumpingadvice.com
  2. Speedycrete

    Avoid fresh concrete "amassing"?

    It depends very much on the slump. Also many other factors, such as mix design, aggregate gradation, w/c ratio, admixes, 'age' of concrete, ie: what point is the hydration reacytion at? Keep in mind that stiff concrete is not easy to work with.
  3. Speedycrete

    Placing wall concrete

    The oval tremie pipe is a common solution. There is no 'manufactured' one that I am aware of. Brundage Bone has developed a 'mud snake' tremie hose for applications such as this, but if it happens to fill up and expand, jamming in the rebar, then it's a detriment. The tremmie pipe along with...
  4. Speedycrete

    Coarse Aggregate change

    I am by no means an expert, but if the coarse aggregate has gotten nominally larger (and is still of the same durability), there should be no adverse affects to the strength density of the concrete. It may however affect the pumpability and workability of the concrete - coming from a former...
  5. Speedycrete

    Water proofing admixtures

    You might want to consider 'fibremesh' in the concrete mix as well. This, in addition to other prudent measures (w/c ratio, and attention to the gradation of the finer fractions of the aggregate) will greatly reduce the cracking potential.
  6. Speedycrete

    Cleaning holes for end-bearing piles

    A vacuum truck?
  7. Speedycrete

    House Foundation Formwork

    Have you considered ICF's? (Insulated Concrete Forms) They are very Do It Yourself friendly. Some are better than others for a tall wall. I was an owner/operator of a concrete pump, and I pumped into about 10 different brands of forms. You will have to pay for quality. Nudura forms are some...
  8. Speedycrete

    Ecology Block Walls

    These might be of some help: http://www.redi-rock.com/engineering/ http://www.inter-block.com/design.html
  9. Speedycrete

    truck-mounted forklift

    Kind of dificult to alter the laws of physics. The load s behind the rear axles, how can how transfer it to the front axles??? The only possibility is for the truck to have a lift axle in front of the driven axle, a 'cheater' if you will. But this reduces the traction in off-road situations...
  10. Speedycrete

    WET DUST SUPPRESSION - Air/Water or just Water

    Can you use a surfactant to help the water atomise more, therefore reqiring less water consumption. I've also heard of systems that use a chemical to 'foam' the water, giving longer lasting results. I once used a water-spray system on the dry circuit of our gravel crushing plant (terribly...
  11. Speedycrete

    3000 psi or 5000 psi concrete

    Don't skimp on the reinforcement if you want to minimize shrinkage cracks. Consider going from 2' pattern to 1' (or even 18"). (not a cheap option either) Plan the control joints to be where you WANT the cracks to be. (under walls) Consider fiber reinforcing if you will have a floor...
  12. Speedycrete

    USE OF SELF CONSOLIDATING CONCRETE IN ACIP PILES

    I have video of this type of pile being drilled and the grout being pumped in. My flash player isn't installing correctly, I haven't been able to preview it, so I'm not sure if the video includes a shot of the rebar cage being lowered into the grout...
  13. Speedycrete

    Civil techinician freelancing

    Is anybody out on their own doing freelance soils/aggregate/concrete testing. I've been a contractor for a number of years, and I'm getting tired of the heavy commitment in capital for equipment, and all the risk for small margins. There are no Engineering firms in my town, so to get a simple...
  14. Speedycrete

    cleaning concrete testing equip

    I guess that link is dead. Try this: http://www.romixchem.com/romix_cart/back_set.php?PHPSESSID=dedb161a07e62a5d93feb3691b268ee0
  15. Speedycrete

    cleaning concrete testing equip

    Try some of this stuff: http://www.romixchem.com/backset/
  16. Speedycrete

    Archimedes Screw for Sediment Dewatering

    Virtually all sand-washing equipment use screws for washing/dewatering. You might want to do a search for aggregate or sand washing on Google, and contact the manufacturers and make an inquiry with their engineering staff. A couple off the top of my head...Mclanahan, Greystone, pioneer...
  17. Speedycrete

    Removing sod from gravel road shoulders

    Here's an idea: http://www.usroads.com/journals/p/rmj/9709/rm970904.htm
  18. Speedycrete

    Auger Cast Piles

    I am a concrete pumper, I was involved in some of the piling work for a project in town that used this method. The piling company had a 'Soilmec' rig. They used a steel plug that had a wider flange on the end to keep it from being pushed in. I also believe that there was an o-ring to give it...

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