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Long-term use of modern Portland cement concrete: The impact of Al-tobermorite formation

Materials & design, 2021-01, Vol.198, p.109297, Article 109297 [Peer Reviewed Journal]

2020 The Authors ;ISSN: 0264-1275 ;EISSN: 1873-4197 ;DOI: 10.1016/j.matdes.2020.109297

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  • Title:
    Long-term use of modern Portland cement concrete: The impact of Al-tobermorite formation
  • Author: Maruyama, Ippei ; Rymeš, Jiří ; Aili, Abudushalamu ; Sawada, Shohei ; Kontani, Osamu ; Ueda, Shinya ; Shimamoto, Ryu
  • Subjects: Aggregate ; Calcium-silicate-hydrate ; Compressive strength ; Reaction
  • Is Part Of: Materials & design, 2021-01, Vol.198, p.109297, Article 109297
  • Description: The distribution of compressive strength in thick concrete members exposed to various environments in a nuclear power plant undergoing decommissioning is investigated. X-ray diffraction data, scanning electron microscopy analysis, and chemical analysis data reveal that rock-forming minerals in the aggregate had reacted and portlandite had been consumed to form calcium alumino silicate hydrates (C-A-S-H) when evaporable water content was sufficient. In addition, the study confirms Al-tobermorite formation in modern concrete after 16.5 years of elevated temperature conditions ranging from 40 to 55 °C. It is concluded that an appropriate aggregate and binder combination for the concrete enhances the compressive strength of thick concrete members thanks to the reaction of rock-forming minerals with portlandite, and also strengthens the chemical stability through the formation of Al-tobermorite under elevated temperature conditions and sufficient evaporable water content. [Display omitted] •The first detailed investigation results of concrete from a commercial NPP 47 years after construction are presented.•Al-tobermorite formation in modern Portland cement concrete in service was confirmed.•Reaction between aggregate and cement hydrates produced C-A-S-H and Al-tobermorite.•The reaction developed the strength of concrete dramatically.
  • Publisher: Elsevier Ltd
  • Language: English
  • Identifier: ISSN: 0264-1275
    EISSN: 1873-4197
    DOI: 10.1016/j.matdes.2020.109297
  • Source: DOAJ Directory of Open Access Journals
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