─ 8 ─laboratory experiment did not become so large even if the strength level increased and that the biting amount of the blade at the breaking load was smaller in ultra-high-strength concrete than in ordinary concrete.(6) It was confirmed that breaking of ultra-high-strength concrete members caused explosion noise of high frequency range associated with vigorous scattering of sharp concrete fragments.(7) The ultra-high-strength concrete members with a water to cement ratio of 13% level can be demolished using the current actual equipment and the breaking demolition method when the bite position could be changed within the working range of the currently available attachments, while the force may be insufficient in terms of compression load if the same position may always be bitten.(8) Demolition of ultra-high-strength concrete members on the basis of the tensile mechanism is advantageous because the increase ratio of tensile strength is smaller than that of compressive strength, and the use of current breaking demolition method makes sense in this respect.This paper is an extended version of published without examination in Japanese14)15).2) Patey: A Quiet Nibble: Vibration less Concrete Breaking Equipment, Contract Journals, Vol.258, Issue 4935, pp.30-31, 19743) Musannif, AAB.: Nibbler- A New Concept in Concrete Breaking, Building Research Establishment, 9, p.5, 19744) Lindsell P.: Demolition Techniques for Concrete Structures, Adhesion Problems in the Recycling of Concrete., Nato Conference Series, vol.4, 19815) Kasai, Y., Rousseau., and Lindsell, P.: Outline of various demolition methods and their evaluation, Proceedings of the Second International RILEM Symposium, Demolition and Reuse of Concrete and Masonry, Vol.1, pp.1-11, 19886) Lauritzen, E. K.: Construction, demolition and disaster waste management: an integrated and sustainable approach.” Boca Raton, USA: CRC Press., 20197) Noboru YUASA: Demolition of Skyscrapers in Japan, Journal of the college of Industrial Technology, Nihon University, Vol.54, No.2, 2021.128) Noboru Yuasa and Tokuhiko Oguma: Transition of Japanese Architectural Demolition “Kaitai”- Until the Establishment of the Tokyo Demolition Cooperative-, Journal of the college of Industrial Technology, Nihon University, Vol.54, No.2, 2021.129) Noboru YUASA: The Transition of Demolition Techniques for Reinforced Concrete Structure in Japan, Journal of the college of Industrial Technology, Nihon University, Vol.54, No.2, 2021.1210) Kawai, T.: State-of-the-Art Report on High-Strength Concrete in Japan-Recent Development and Applications-, Proceedings of JSCE-VIFCEA Joint Seminar on Concrete Engineering in Vietnam, pp.87-107. 200511) Yamada, H., Sumi, K., and Sueyoshi, K: Demolition of buildings with a high-strength concrete.” Concrete Journal, 29(7), pp.77-82, 1991 (in Japanese)12) Suzuki, S., Hasebe, H., Handa, M., Shikamori, Y. and Wada, T., (2007). “Demolition experiment of ultra-high strength concrete with a strength of 100N/mm2 class.” Preprint of the Annual Meeting of AIJ, Materials and Construction Session, A-1, 1275-1278 (in Japanese)13) Sakato, S., Sakato, M., Miura, S., Ito, T., Nakata, Y. and Asai, M. Crushing Machine, United States Patent 5,890,667, 199914) Noboru YUASA: Study on demolition load of reinforced concrete structure using high strength and ultra-high strength concrete.” Proceedings of Japan Union Cement Concrete, pp.67-72, 2014 (in Japanese)15) Noboru YUASA: Application of Crushing Method to the Demolition of High-strength and Ultra-high Strength Concrete Structure, Japan Demolition Contractors Association, pp.19-24, 2020.8 (in Japanese)DisclosureReferences1) Noboru YUASA: Establishment and Prospect of Demolition Business in Japan, Journal of the college of Industrial Technology, Nihon University, Vol.54, No.2, 2021.12
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