WATER-BLOCKING FILLER AND FILLER FOR MANMADE MULTI-BARRIERS USING SAID WATER-BLOCKING FILLER

摘要

Provided are a water-blocking filler, the swelling properties of which do not decrease easily even when in contact with water containing calcium ions, and a filler for manmade multi-barriers with said water-blocking filler as the manmade multi-barrier filler. A water-blocking filler mainly comprising sodium bentonite obtained by mixing 30 weight% or less, in terms of inner percentage, of a pozzolan substance such as fly ash or silica fume with said bentonite, and a filler using said water-blocking filler that is used for manmade multi-barriers in radioactive waste disposal facilities.