Frost Damage Restraint Technology with Special Paraffin Emulsion
By A. Okada, H. Maruta, H. Nakamura and T. Hayakawa
Concrete Journal, Vol.60, No.10, Oct. 2022
- Synopsis
- This paper reports on the characteristics of concrete using a special paraffin emulsion, which was developed as a new technology for the restraint of frost damage, and describes an example of concrete construction using this new technology. The freeze-thaw resistance of concrete was significantly improved by the use of the special paraffin emulsion. This is attributed to the aggregation in concrete of paraffin particles forming aggregate bodies ranging in size from 20 μm to 200 μm, which reduce expansion pressure during freezing, an effect similar to that obtained from the entrainment of fine air bubbles. Concrete mixed with the special paraffin emulsion was applied to an actual structure. It was confirmed that such concrete can be manufactured in an actual plant like ordinary concrete, and that it remains sound even two years and five months after construction.
- Keywords:
- Frost damage, Paraffin, Emulsion, Freeze-thaw, Scaling, Relative dynamic modulus of elasticity, Air-void spacing factor
