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Freezing Restraint Pavement
(containing de-icing agent)
NF-Top Type I
What is NF-Top Type I?

For the purpose of protection or retarding the freezing in snowy cold areas, generally calcium chloride is sprayed on road surface. NF-Top Type I is an asphalt mixture which contains freezing retarder.
Functions
  1. When water infiltrate into the voids of mixture, the chlorides such as calcium chloride are solved and seeped out.
  2. The effect is equivalent to that of calcium chlorides being sprayed on road surface.

Where to use?
To roads areas, parking lots, plaza and so on in snowy cold.

The Freezing Retarder
Grains or finer grains composed of mainly calcium chloride, natrium chloride and calcium carbonate.

Results of Marshall
Tests (Example)
 
The Result of Freezing Test (Example)
Table 1 The Standards of Evaluating the Degree of Freezing
Degree of freezingDescription
6not frozen at all
5surface and sides are frozen slightly
4frozen, but fractured by tweezers with light push (sherbet like)
3fairly frozen, but fractured by tweezers. (sherbet like)
2completely frozen, pushing by finger water stick to finger
1completely frozen, pushing by finger water hardly stick to finger






Fig. 6 Result of Freezing Test
Construction Dictionary
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