<P>PROBLEM TO BE SOLVED: To provide a sediment supply method which employs a spontaneous decay-type hardening body capable of cause secure spontaneous decay, while facilitating the securement of a material and contribute to the recycling of resources. ??<P>SOLUTION: This sediment supply method is characterized in that the spontaneous decay-type hardening body, which is hardened in the state of maintaining the expansion self-destroyability of a calcia clinker and/or calcia clinker-ground product by mixing water with a cement composition having a hydraulic binding material, and the calcia clinker and/or calcia clinker-ground product, is installed at the waterfront of a river or the sea and below the water surface thereof, decayed until it is turned into a sediment shape by the water of the river or the sea, and submerged in the river or the sea. ??<P>COPYRIGHT: (C)2010,JPO&INPIT ??
