Monday, July 5, 2010

accelerators of formation of concrete (setting )

  1. Calcium chloride ( most common ) , calcium formate
  2. Increase rate of setting and hardening
  3. High heat evolution
  4. Use in winter and rapid removal of formw
  5. Adverse effect : increase drying shringkage reduce resistance to sulphate attack , > 2% calcium chloride > corrosion of rebar

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