Abstract
The use of fly ash (FA) for the production of new concrete seems to be a promising solution for “greening” of construction industry. However, replacement of cement with supplementary cementitious materials such as fly ash influences concrete performance especially in terms of durability. One of major durability problems worldwide is carbonation-induced corrosion, given that a large number of infrastructural objects are exposed to a CO2-rich environment. The objective of this research was to analyse the influence of cement substitution level on accelerated and natural carbonation of concrete. Experimental program considered testing of 10 concrete mixtures selected in two groups – with water to binder ratio of 0,5 (400 kg/m3 of binders) and 0,6 (300 kg/m3 of binders), while in each group the cement substitution ratio was varied from 0% to 50%. Carbonation depth was measured after 14, 21 and 28 days of exposure to 2% CO2 in carbonation chamber, while the twin samples were exposed to natural carbonation. It was shown that accelerated carbonation depths were similar in both groups for mixtures up to 30% of FA, but they were doubled and tripled for larger replacement levels. Using the previously modified fib carbonation model for service life design, the prediction of natural carbonation was made. A reliability of proposed modification was assessed by comparison between predicted and measured values of natural carbonation after 19 and 34 months of exposure.
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Acknowledgements
This work was supported by the Ministry for Education, Science and Technology, Republic of Serbia [grant number 200092]. The authors gratefully thank to master students – Edin Čavić, Maša Milovanović and Nikola Knežević for their significant contribution to conducted experimental work.
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Carević, V., Radević, A., Ignjatović, I. (2023). Influence of Fly Ash as Cement Substitution on Accelerated and Natural Carbonation of Concrete. In: Jędrzejewska, A., Kanavaris, F., Azenha, M., Benboudjema, F., Schlicke, D. (eds) International RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures. SynerCrete 2023. RILEM Bookseries, vol 44. Springer, Cham. https://doi.org/10.1007/978-3-031-33187-9_106
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