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幌延深地層研究計画における低アルカリ性セメントの適用性に関する研究(委託研究)

Study on applicability of low alkaline cement in Horonobe Underground Research Laboratory Project (Contract research)

松田 武*; 納多 勝*; 入矢 桂史郎*; 小西 一寛*; 中山 雅; 小林 保之

Matsuda, Takeshi*; Noda, Masaru*; Iriya, Keishiro*; Konishi, Kazuhiro*; Nakayama, Masashi; Kobayashi, Yasushi

幌延深地層研究センターでは、地下施設の一部において低アルカリ性セメント(HFSC)を用いたコンクリートの施工性確認試験(原位置試験)の実施を計画している。それまでにHFSCが実工事で施工可能な性能を持つことを確認しておく必要がある。本年度は、幌延地下施設内での原位置試験計画を検討するとともにHFSCコンクリート材料のpH低下挙動の把握を実施した。また、HFSCを用いた原位置試験計画では、HFSC424N(普通ポルトランドセメント:シリカフューム:フライアッシュ=4:2:4)を吹付けコンクリートとして使用することを前提とした原位置試験計画を検討した。実施場所は地下施設の140m坑道、試験期間は10年程度を目安とし、普通コンクリート支保工との比較が可能な計画とした。また、現地で調達する材料を使用した場合もその強度を満足できることを確認するため、平成17年度に選定した配合に基づき、現地調達の細骨材・粗骨材を使用して強度試験などを実施した。HFSCコンクリート材料のpH低下挙動の把握に関しては、長期間の密封浸漬試験の供試体について、浸漬液のpH測定及び成分分析並びに固相の成分分析を行った。

In Horonobe Underground Research Center construction of underground facility began in 2005 and construction practicality test with HFSC (Highly Fly-ash contained Silica-fume Cement) is planned in a part of the gallery. Before the HFSC will be contracted in the gallery it is necessary to check that the HFSC has performance under the actual construction. The main work of this Japanese fiscal year is making a detailed test plan for the HSFC construction practicality, that is scheduled after 2007 and laboratory tests on lowering behavior of pH in the HFSC concrete were conducted. On the construction practicality test with low alkaline concrete, HFSC in-situ experiment plan was studied in case using HSFC424N as shotcrete. The aims of the in-situ test are the validation in applicability of low alkaline concrete as a support member for underground opening in the realistic geological environment and building the method to evaluate influence to the surrounding geological environment. The location of the in-situ test is in the connection tunnel of a depth of 140m and the geology is the Koetoi formation. The period of the test is approximately 10 years. The test plan was designed to be able to make a comparison with Ordinary Portland Cement. As it is necessary to confirm the strength property of the HFSC concrete with materials procured at construction site, strength of the base concrete using local procured fine aggregate and coarse aggregate based on the result of the selection of mix proportion in 2005 research was checked. On laboratory tests on lowering behavior of pH in HFSC concrete, the pH of immersion fluid was measured and components of the immersion fluid and the solid phase were analyzed using test specimens in a long-term immersion test which had been continued since 2005.

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