To realize early traffic deregulation by drawing traffic lines with a hydraulic composition comprising a fired product including specific amounts of one or more kinds of C11A7CaCl2, C11A7CaF2, and C3A and 1 or more kinds of C2S and C3S and gypsum through the thin layer concrete-overlaying process.

This hydraulic composition is a fired product from one or more kinds of municipal refuse-burnt ash or sewage sludge-burnt ash and contains 10-40 wt.% of 3 kinds of aluminum compounds, for example, C11A7CaF2 or the like. This composition is combined with steel fibers and rust-preventive agent and the resultant composition is applied to the thin-layer overlaying process to increase the long-term strength as well as the short-term strength whereby a concrete composition whose cracking can be controlled. The rust- preventive agent is, for example, generally used calcium nitrite. As the steel fiber, can be used iron wires and the like in conformity to JIS G3532 and the content of the wires is preferably 0.5-2.0 vol.% based on the hydraulic composition.