Natural Sand Vrs Manufactured Sand

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Natural Sand Vrs Manufactured Sand
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• We are in an area that in the past used natural
  sand for all concrete mixes. We all know the
  times have changed. My question is, how do we
  educate the pump owners and operators in our area
  that manufactured sand is the future?

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• They claim that it will not pump, and it wears
  the unit out much faster than natural sand. We
  also have discovered they are priming the pump
  with the concrete mix.

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• I would like to hear from other concrete
  suppliers and pump manufactures on the pumping of
  manufactured sand. Is it a wide spread problem? 

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• It's only a matter of time before the pumping
  guys will have 2 choices -Pay a premium for
  concrete made with natural sand or Pay for add
  mixtures and the additional wear costs

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• Pumping concrete with manufactured sand increases
  the pumping pressure and causes additional
  wear/tear on equipment. But t the more organic
  issue is the ability to accept the change.

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• To manufactured sand mix designs pump, place, and
  finish just fine. The challenge is in proper
  proportioning (just like any concrete mix design)
  and the ability of the finisher to accept those
  changes.

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• While it is true that rounded particles should
  pump well than angular particles do, many natural
  sands available to our region have very little on
  the 0.15mm, and 0.3mm.

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• The manufactured sands we use provide the missing
  fines that not only assist pumping but also
  finishing. Where possible, we blend both sands
  for the best of both worlds.

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• We are also fortunate to have a department of
  transport that recognizes a finer grading that
  benefits all parties. The department of transport
  passing spec is 15-20 for the 0.3 mm and 8-22
  for the 0.15 mm. 

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• Degussa Admixtures has actually created a Liquid
  Sand Program that has helped producers and
  contractors throughout the nation to overcome the
  problems associated with the use of manufactured
  sand in concrete.

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• This Liquid Sand Program involves the use of a
  unique VMA (Viscosity Modifying Admixture) that
  lubricates the concrete mix to make it easier to
  pump, place, and finish.

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• This means reduced pump pressures, less wear and
  tear on equipment, and less work to finish the
  surface. The VMA also helps to control excess
  bleeding, which can be an issue with the use of
  manufactured sand.

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• Yuleba Minerals (www.yulebaminerals.com.au )
  produces a natural sand with full grading which
  is available throughout Roma, Miles, Chinchilla
  and the Southern Queensland.