Fresh‐state performance design of green concrete mixes with reduced carbon dioxide emissions

İrem Şanal

Greenhouse Gases: Science and Technology, 2018, vol. 8, issue 6, 1134-1145

Abstract: The use of environment‐friendly cement‐replacement materials results in concrete mixes with significantly reduced water‐to‐binder ratios, leading to increased viscosity and yield stress. This may be considered a hindrance to the widespread implementation of this green concrete technology. In this comprehensive experimental study, a performance‐based design was applied to select different concrete mixtures for reduced carbon dioxide (CO2) emission and improved performance in terms of both fresh and hardened states. A parameter study was carried out to study the rheological properties, compressive strength, and CO2 emissions of 26 mortar mixes with different binder systems and different water‐to‐binder ratios (W/B) with the aim of determining alternative low‐environment impact combinations. A strong effect of the paste composition (binder amount) on the plastic viscosity and resulting CO2 emissions was observed. For fixed proportions of paste and fine aggregate the plastic viscosity shows a non‐linear decreasing trend to the W/B ratio and non‐linear increasing trend to the B/(W+B) ratio. Finally, a successful candidate paste composition satisfying the performance requirements was selected as a reduced CO2 emission alternative. The candidate paste composition (Mix No. 6) with relatively large amounts (fly ash / cement = 3) of supplementary cementitious materials (fly ash) was selected for the development of environment‐friendly concrete mixtures. The maximum compressive strength increase with this mix was found to be around 25% and maximum CO2 reduction obtained was about 68% when compared to that of the control mix. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

Date: 2018
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https://doi.org/10.1002/ghg.1826

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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:8:y:2018:i:6:p:1134-1145

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