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【第6回舗装工学講演会講演論文集 2001年12月】 |
舗装工学論文集 Vol. 6, 39-46, 2001.12 |
小島 逸平１
・佐沢 昌樹２
1フェロー会員 株式会社ガイアートクマガイ技術研究所（〒300-2445 茨城県筑波郡谷和原村小絹216-1）
2 正会員 株式会社ガイアートクマガイ技術研究所（〒300-2445 茨城県筑波郡谷和原村小絹216-1）
特殊な高吸水性ポリマーを舗装体に固定することによって、凍結防止剤を舗装体内に貯留でき、この貯留した凍結防止剤が滲み出てることによって路面凍結を抑制し、凍結防止剤が次第に流出して凍結抑制機能が低下した時には、凍結防止剤を路面に再散布することによって、再び凍結抑制機能を回復することができる、機能回復型凍結抑制舗装を、平成１０年から実路に適用してきた．本報告は、その特徴と３年間の追跡調査から判ってきた効果や問題点と、更に改良技術について報告する．
Key Words: porous asphalt,
topcoat for porous asphalt, voids blocking, recovery performance, adhesional
wetting
Ippei KOJIMA , Masaki SAZAWA
There
have been various contrived methods in use for preventing the pavement surface
from freezing in cold snowy areas. Road heating systems are certainly
effective. But it is very expensive for construction and maintenance. Another
methods adopted, for example, are an asphalt mix incorporated with a salt, (
i.e., salt-like material such as calcium chloride ) and with an elastomer such
as rubber. The salt-containing pavement becomes ineffective after one to two
years because of leaching out of the salt. The elastomer in the pavement tends
to come out in summer onaccount of its low combined strength in general. And
the pavement tends to be rutted in summer. It is important thatthe pavement
maintains the freeze-preventing effect over a long period of time and can
restore when its effect has been lost.
The newly developed
freeze-preventing surface course is a thin layer of open graded asphalt mixture
whose voids are grouted with cement slurry comprising portland cement, specific
salt, and superabsorbent polymer.