Hardened material for creating seaweed bed

Abstract

To provide a hardened material for creating a seaweed bed that can efficiently supply ferrous ions to organisms. Cement, steel and iron slag crushed to 40 mm or less, decomposed hardwood chips on the order of 20 to 80 mm, and water are mixed, and the obtained mixture is cast into a formwork. The mixture is then cured within the formwork until it hardens. Next, the concrete obtained by being hardened within the formwork is crushed so as to have a mass per unit volume of 2 to 3 tons/m 3 , whereby a concrete block for creating a seaweed bed whose surface shape is of natural stone is obtained

1 . A hardened material for creating a seaweed bed, which is a hardened composition containing:
 a solidification material;   steel and iron slag;   wood chips; and   water.   
   
   
       2 . The hardened material for creating a seaweed bed according to  claim 1 , having a mass per unit volume of 2 to 3 tons/m 3 . 
   
   
       3 . The hardened material for creating a seaweed bed according to  claim 1 , having a surface shape of natural stone. 
   
   
       4 . The hardened material for creating a seaweed bed according to  claim 1 , wherein
 the composition contains excretion.   
   
   
       5 . The hardened material for creating a seaweed bed according to claim T, wherein
 the solidification material is cement.   
   
   
       6 . The hardened material for creating a seaweed bed according to  claim 1 , wherein
 the wood chips have at least partially decomposed.   
   
   
       7 . The hardened material for creating a seaweed bed according to  claim 1 , wherein
 the composition contains leaf mold.   
   
   
       8 . The hardened material for creating a seaweed bed according to  claim 1 , wherein
 the composition contains charcoal.