Low alkaline cement used in the construction of a gallery in the Horonobe Underground Research Laboratory

Masashi Nakayama, Haruo Sato, Yutaka Sugita, Seiji Ito, Masashi Minamide, Yoshito Kitagawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

In Japan, any high level radioactive waste (HLW) repository is to be constructed at over 300 m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various admixtures. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (Highly Fly-ash Contained Silicafume Cement), containing over 60 wt% of silica-fume (SF) and fly-ash (FA). HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in the Horonobe Underground Research Laboratory (URL). The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40 wt% OPC (Ordinary Portland Cement), 20 wt% SF, and 40 wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC. The total length of tunnel using HFSC shotcrete is about 73 m and about 500 m3 of HFSC was used. The workability of HFSC shotcrete was confirmed in this experimental construction.

Original languageEnglish
Title of host publicationASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
Pages51-56
Number of pages6
DOIs
Publication statusPublished - Dec 1 2010
EventASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010 - Tsukuba, Japan
Duration: Oct 3 2010Oct 7 2010

Publication series

NameProceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM
Volume2

Other

OtherASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010
CountryJapan
CityTsukuba
Period10/3/1010/7/10

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Keywords

  • HLW
  • Horonobe URL project
  • In-situ construction
  • Low alkaline cement

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Energy Engineering and Power Technology
  • Waste Management and Disposal

Cite this

Nakayama, M., Sato, H., Sugita, Y., Ito, S., Minamide, M., & Kitagawa, Y. (2010). Low alkaline cement used in the construction of a gallery in the Horonobe Underground Research Laboratory. In ASME 2010 13th International Conference on Environmental Remediation and Radioactive Waste Management, ICEM2010 (pp. 51-56). (Proceedings of the International Conference on Radioactive Waste Management and Environmental Remediation, ICEM; Vol. 2). https://doi.org/10.1115/ICEM2010-40038