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  • how to cut green concrete
  • It is said by many, that cutting green concrete is an art, not a science. Perhaps it is. Certainly it

    can be quite a challenge, and there seem to be few guarantees of a successful outcome.


    The many variables involved make it extremely difficult to judge when and where the concrete
    will or won’t crack. Variables meaning atmospheric temperature, presence of wind, moisture
    content of the concrete, concrete constituents, where control joints have been made, how deep

    the cuts are etc


    As a general rule, cutting early rather than late, and more rather than fewer joints, will reduce the
    likelihood of cracking. Can the concrete be cleanly cut (minimally spalled) in a very green or

    uncured state? Answer- often with difficulty. But there are a few techniques which will help.


    Firstly, because the uncured concrete is not holding the aggregate very firmly, any pressure
    from a blade on a pebble or piece of aggregate will create the potential for ejection from the
    concrete. Pebble is worse in this respect, than angular aggregates, because the smooth surface

    makes a tenacious mechanical grip rather unlikely in the early stages of cure.


    The choice of cutting method is important when the concrete is very green. Some contractors
    save their nearly worn out green concrete or cured concrete blades for this task, as they have

    become much thinner with wear, and put less pressure on the concrete aggregates.


    Other contractors will use thinner continuous rim, or turbo blades, to reduce the likelyhood of
    spalling, and some specialists resort to early entry concrete saws specifically designed for this
    purpose. These saws may cut without water, use special blades and devices to hold the concrete

    in place while it is being cut, and are often critically used by the concrete laying contractor.


    Although not talked about very much, water can dislodge aggregate. A stream of blade coolant
    carried with the blade in the cut is ejected at approximately 9000 surface feet per minute. That is
    sufficient force to remove stones from the concrete edge just produced by the blade. For this

    reason many green concretes are cut with little or no water.


    First class mechanical condition of the saw will improve the cutter’s chances of success as will

    a long pointer to minimise curves cuts and side pressures on the blade.


    Green concrete is a fragile material. It’s contrary. It needs care and skill, and an ounce of luck.
    Do remember to make the first exploratory cuts where any problems will be of least significance

    to the proud new owner.


    Ejection of the layer, as well as the aggregate,can occur in severe cases of a marred job!

    BSC TOOLS CO.,LTD
    www.diamondtoolchina.com
    e-mail:bsctools@yeah.net
    MSN:bsctools@hotmail.com
    Skype:bsctools
    Attn:Nicholas-Chen

  •    2013/9/10
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