Taisei Corporation

Chichibu Cement Co., Ltd.

Ozawa Concrete Industry Co., Ltd.

Shizuko Kushida

Osamu Suzuki

Kanjiro Ishizaki

Yasunori Matsuoka

Takafumi Naito

Seiji Kaneko

Akira Asami

Takashi Tsubahara

Takefumi Shindo

A pressure-regulating device for impact-resistant containers used for storage, transportation and disposal of hazardous waste materials, is herein disclosed, which comprises a vent fixed to the lid of said container to keep the gaseous phase pressure inside said container at a positive pressure of 50% or less of the pressure resistance of said container, the vent being columnar and made of an alumina-based sintered ceramic and having a porosity of 50% or less, a pore diameter range of 0.4 to 1.4 .mu. and a length (mm)/cross-sectional area (mm.sup.2) ratio of 2 to 10.

Pressure-regulating device for use in storage, transportation and

A concrete structural member of improved stability is produced by preparing a concrete composite layer having a concrete layer on one side and an aggregate layer on the other side thereof, impregnating the composite layer with a monomer, thermally or catalytically polymerizing the monomer impregnated in the composite layer, and thereafter placing fresh concrete on the aggregate layer side of the polymer-impregnated composite layer.

Concrete structural member and method for manufacture thereof

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Tokyo, Japan

Shizuko Kushida