Dipayan Jana

Dipayan Jana's Posts

  • Features

    Air entrainment in concrete was discovered accidentally about 70 years ago. Since then, entrained air has provided many blessings to concrete such as increased workability at lower water-cement ratios and reduced bleeding. And there is its primary function: maximizing the resistance of hardened concrete to damage from cyclic freezing and deicing chemicals.

  • Features

    Our experience is that a one-year waiting period is not needed for concrete that is well made, well finished, of adequate strength, has undergone a short period of air drying, and has an effective air-void system. Concrete that does not meet these criteria is always vulnerable to scaling when it becomes saturated and freezes. De-icing chemicals increase that vulnerability and may lead to scaling in concrete that might otherwise have performed acceptably despite being marginally air-entrained or having surface defects caused by improper finishing.

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