PROBLEM TO BE SOLVED: To provide a calcium hydroxide-containing granular material sand capping structure and method that can achieve sufficient decomposition/volume reduction and stabilization of an organic material.SOLUTION: A coal ash agglomerated material sand capping structure 10 comprises a base part 11 having coal ash agglomerated material formed as a sand capping material on bottom mud 1 deposited on a water bottom of a closed water area to a predetermined thickness, and a flat part 12, a left-side slope part 13 L, and a right-side slope part 13R constituting a trapezoidal mound part formed on the base part 11 to have slopes having a predetermined gradient by using coal ash agglomerated material as a sand capping material. Further, a coal ash agglomerated material sand capping structure 20 comprises a base part 11, and a plurality of conic parts 22 constituting a plurality of conic mound parts formed on the base part 11 linearly at predetermined intervals while having slopes with a predetermined gradient by using coal ash agglomerated material as a sand capping material.COPYRIGHT: (C)2013,JPO&INPIT【課題】有機物の分解・減容化および安定化を十分に図れる水酸化カルシウム含有粒状物覆砂構造および方法を提供する。【解決手段】石炭灰造粒物覆砂構造10は、閉鎖性水域の水底に堆積した底泥1の上に石炭灰造粒物を覆砂材として所定の厚さに形成された基礎部11と、石炭灰造粒物を覆砂材として基礎部11の上に所定の勾配の斜面を有するように形成された台形状マウンド部を構成する平坦部12、左側斜面部13Lおよび右側斜面部13Rとからなる。また、石炭灰造粒物覆砂構造20は、基礎部11と、石炭灰造粒物を覆砂材として基礎部11の上に所定の勾配の斜面を有するとともに所定の間隔で直線状に並べて形成された複数個の円錐状マウンド部を構成する複数個の円錐状部22とからなる。【選択図】図1
