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Durability of new environment-friendly concrete without portland cement

Author(s): M. Ogino, R. Okamoto, S. Miyahara, E. Owaki, J. Matsumoto, J. Sakamoto, T. Maruya
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 41 - 48
Total Pages: 8
Language: English

Processes such as burning fossil fuel and decarbonating limestone used in the manufacture of Portland cement account for 90% of CO₂ emissions related to concrete production in Japan. The use of alkali activated slag in concrete has been studied as a way to reduce the proportion of Portland cement and thereby reduce CO₂ emissions. Going further, the authors have been investigating an environment-friendly concrete that contains no Portland cement – a kind of slag concrete activated by calcium compounds and consists of ground granulated blast furnace slag, slaked lime, an expansive additive and limestone powder. This is a cast-in-place concrete and it does not require any secondary curing. Production of this environmentfriendly concrete cuts CO₂ emissions by 80% compared with concrete containing only ordinary Portland cement. In this study, the performance of the environment-friendly concrete is evaluated and compared with concrete containing blast furnace slag cement type-B (BB concrete). Resistance to alkali-silica reaction and chloride penetration is better than that of BB concrete. Resistance to freezing and thawing and carbonation is slightly lower than that of BB concrete. However, these characteristics can be adjusted by altering the water/powder ratio.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00

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