This investigation was performed as a part of Study on Containing Radioactive Wastes, which was a part of the extensive studies of concrete containers for the disposal of radioactive wastes in the deep sea sponsered by the Committee on Concrete of Japan Civil Engineers Society.
　The purpose of this investigation was to study the properties of prepacked concrete using crushed glass as coarse aggregate. Tests were made on penetrability of intrusion mortar into the voids of the specific aggregate, and compressive and flexural strengths and impact resistivity of the concrete. The authors conlude that the penetrability of intrusion mortar was fairly good to bind the smashed glass instruments to form a unit mass of prepacked concrete, and that the strengths of the prepacked concrete were sufficient so as required in handling, shipping, and transporting it. The authors also suggest two means of disposing glass instruments and vessels contaminated with radioactive wastes. The first is to use them as coarse aggregate after crushing and enclose them within concrete. In this case the glass should not be crushed into too small pieces, which would make the intrusion mortar impenetrable. The other is to the pack the pieces of finely smashed glass i basckets, made with fine mesh screen and reinforced with steel bars, and employ these basckets as coarse aggregate for prepacked concrete. In either case, prefabricated concrete container can be effectively used as form work.