HEAVY METAL-INSOLUBILIZED SOLIDIFICATION MATERIAL AND TECHNIQUE FOR IMPROVING CONTAMINATED SOIL

摘要

Provided are: a heavy metal-insolubilized solidification material which can improve the strength of loose soil contaminated by a heavy metal and can also reduce the elution amounts of arsenic and lead; and a technique for improving loose soil or sludge. A heavy metal-insolubilized solidification material which can solidify loose soil or sludge containing a heavy metal to produce improved soil and which can prevent the elution of arsenic and lead from the improved soil, the heavy metal-insolubilized solidification material being characterized by comprising a cement-based solidification material that comprises cement, a blast-furnace slag and gypsum and lime hydrate or light-burnt dolomite, wherein the amount of lime hydrate or light-burnt dolomite added is 10 to 55% by mass relative to the total amount of the cement-based solidification material and lime hydrate or light-burnt dolomite; and a technique for improving loose soil or sludge using the heavy metal-insolubilized solidification material.