土構造物上に用いる短繊維補強コンクリート路盤の開発

摘要

従来,スラブ軌道は,沈下が少ないトンネルや高架橋rnの区間で用いられ，土構造物の区間ではバラスト軌道がrn用いられてきた。しかし，近年では，図1に示すようにrn高品質な路床（K_(30)値≧110MN/m~3）上に，厚さ30cmのrn上部路盤（鉄筋コンクリート版）と厚さ15cmの下部路rn盤（粒度調整砕石層）で構成されるコンクリート路盤をrn設けることで，土構造物上にスラブ軌道を適用することrnが可能となっている。%To apply short fiber reinforced concrete to concrete roadbed on an earth structure, the mix test of the short fiber reinforced concrete was carried out paying attention to its flowability and shrinkage reduction. The test result has shown that the flowability is improved by increasing cement and fine aggregate in concrete, and the shrinkage strain is reduced by using an expansive additive and shrinkage reduction agent together. Moreover, as a result of executing trial construction of the concrete roadbed of 60m in length, the ease of construction and the shrinkage reduction effect were confirmed.