| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor slab and the like made of lightweight concrete, which have high water resistance, are lightweight and obtain sufficient strength.SOLUTION: A road structure 3 comprises a floor slab 31, a water-resistant layer 33 and a pavement layer 35. The floor slab 31 is a RC floor slab using concrete that contains an expansive material and a lightweight aggregate. A low addition type expansive material is used as the expansive material and mixed in the concrete so that a ratio of the low addition type expansive material becomes 20 kg or more and 40 kg or less per 1 mof the concrete. A water-binder ratio at the time of the preparation of the concrete is adjusted to be 38 wt.% or more and 42 wt.% or less. |
