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Compressive strength development of fly ash concretes cured under different conditions

Author(s): Tayfun Altuğ Söylev, Turan Özturan
Paper category: Proceedings
Book title: SynerCrete’18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time Vol. 1 & 2
Editor(s): Miguel Azenha, Dirk Schlicke, Farid Benboudjema, Agnieszka Jędrzejewska
ISBN: 978-2-35158-202-2
e-ISBN: 978-2-35158-203-9
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 141-146
Total Pages: 6
Language : English

Abstract: The use of fly ash as a cement replacement material brings economic, environmental advantages to concrete technology as well as some improvements in the properties of concrete. However, fly ash concrete may not reach specified strength values because of slower pozzolanic reaction and consequently its use in concrete is limited. Effective curing can lead to higher use of fly ash in concrete, by enabling higher strength at earlier ages. In the present study, the effect of three different curing regimes on the compressive strength (3, 7, 28, 56 and 91 days) of concretes with 0, 15, 30 and 45% fly ash replacement ratios. The ratios represent fly ash percentages with respect to the total binder content. The curing regimes were 1) air curing; 2) one week 30°C water curing + air curing; 3) one week 20°C water curing + air curing. Specimens with hot water curing (no 2) yielded higher results until 28 days when compared to those with mild water curing (no 3). The air curing caused lowest results with significant differences compared to water curing regimes. Water curing was effective in closing the gap between concretes with and without fly ash. However, beyond 15% cement replacement ratio, fly ash concretes had lower strength, even at 91 days.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00

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