Published April 2018 | Version v1
Journal article Metadata-only

Demonstration experiment on durability of concrete containers storing incineration fly ash contaminated with radionuclides and technical requirements of such containers

Creators

  • 1. Taiheiyo Cement Corporation, Central Research Laboratory, Sakura, Chiba (Japan)
  • 2. The National Institute for Environmental Studies, Fukushima Branch, Miharu, Fukushima (Japan)
  • 3. Nihon University, College of Engineering, Koriyama, Fukushima (Japan)
  • 4. Tokyo Institute of Technology, Dept. of Civil and Environmental Engineering, Tokyo (Japan)

Description

Concrete containers have been developed to safely store a significant amount of waste contaminated by radioactive cesium generated in nuclear power plant accidents. In this study, assuming the most severe conditions for concrete containers, hydrated incineration fly ash was put in a full-sized container, and the container was exposed to outdoor weather for about two years to evaluate the durability of concrete containers. It is found that in ordinary concrete, calcium oxychloride is formed by the reaction of CaCl2 in incineration fly ash and Ca(OH)2 in hardened cement pastes, leading to a relatively early onset of mortar scaling and delamination. On the other hand, in the case of fly ash concrete, ingress of chloride ion and calcium oxychloride formation are inhibited. Thus, use of fly ash concrete is effective concerning material durability. The technical requirements of concrete are summarized based on the results of the exposure tests. (author)

Availability note (English)

Available from https://www.jstage.jst.go.jp/browse/coj/

Abstract (Japanese)

原子力発電所事故で発生した放射性セシウムに汚染された廃棄物を安全に保管することを目的に、コンクリート容器の開発が行われている。本研究では、コンクリート容器が遭遇する最も過酷な条件を想定し、実物大の容器に加水した焼却飛灰を投入して、約2年間屋外への暴露を行い、コンクリートの耐久性を評価した。その結果、普通コンクリートでは、焼却飛灰中のCaCl2と硬化体中のCa(OH)2との反応で複塩が生成し、モルタル浮きや剥離が比較的早期に生じること、フライアッシュコンクリートでは、塩化物イオンの浸透や複塩生成は抑制され、材料面の対策として有効であることが分かった。暴露試験の結果をもとにコンクリート容器の技術要件をまとめた。(著者)

Additional details

Additional titles

Original title (Japanese)
放射性物質に汚染された焼却飛灰等の保管に用いる コンクリート容器の耐久性実証試験と技術要件

Identifiers

URL
https://www.jstage.jst.go.jp/browse/coj/;

Publishing Information

Journal Title
Konkurito Kogaku (Online)
Journal Volume
56
Journal Issue
4
Series
雑誌名:コンクリート工学
Journal Page Range
p. 296-303
ISSN
2186-2753

INIS

Country of Publication
Japan
Country of Input or Organization
Japan
INIS RN
49069099
Subject category
S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
Descriptors DEI
CALCIUM CHLORIDES; CALCIUM HYDROXIDES; CESIUM ISOTOPES; CONCRETES; CONTAINERS; CONTAMINATION; DEMONSTRATION PROGRAMS; FLY ASH; FUKUSHIMA DAIICHI NUCLEAR POWER STATION; HYDRATION; MELTDOWN; MORTARS; NUCLEAR POWER PLANTS; SERVICE LIFE
Descriptors DEC
ACCIDENTS; AEROSOL WASTES; ALKALINE EARTH METAL COMPOUNDS; ASHES; BEYOND-DESIGN-BASIS ACCIDENTS; BUILDING MATERIALS; CALCIUM COMPOUNDS; CALCIUM HALIDES; CHLORIDES; CHLORINE COMPOUNDS; COMBUSTION PRODUCTS; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; HYDROXIDES; ISOTOPES; LIFETIME; MATERIALS; NUCLEAR FACILITIES; OXYGEN COMPOUNDS; POWER PLANTS; REACTOR ACCIDENTS; REACTOR SITES; RESIDUES; SEVERE ACCIDENTS; SOLVATION; THERMAL POWER PLANTS; WASTES

Optional Information

Notes
15 refs., 7 figs., 6 tabs.