Abstract

Residual hydrated cement powder (HCP) produced from recovering recycled concrete is usually restricted from being directly reused in concrete due to its high water absorption and porous structure. This study aims to enhance the properties of HCP via CO2 treatment. The simultaneous impacts of CO2 treatment and water-to-cement (w/c) ratio on physical properties and microstructure of HCP were studied. The findings showed that carbonation can effectively reduce the porosity of HCP owing to the formation of calcite, and the calcite content increases with increasing w/c ratio. Furthermore, there was a reduction in the 28-day compressive strength of paste specimens containing uncarbonated HCP, while paste containing 5%–20% of carbonated HCP (CHCP) achieved higher strength than the control paste. It is believed that the presence of calcite in CHCP leads to the formation of more stable calcium aluminate monocarbonate. The mass ratio of highly crystalline to poorly crystalline CaCO3 increased with an increase in the replacement level of CHCP, and the w/c ratio exhibited no significant influence at a given replacement ratio.

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Data Availability Statement

All data, models, and code generated or used during the study appear in the published article.

Acknowledgments

The research funding from the National Natural Science Foundation of China (5181101350 and 51950410584) and the Young Talent Program of the Hunan Provincial Government (801201048) is gratefully acknowledged.

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Go to Journal of Materials in Civil Engineering
Journal of Materials in Civil Engineering
Volume 33Issue 4April 2021

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Received: Nov 7, 2019
Accepted: Sep 1, 2020
Published online: Jan 28, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 28, 2021

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Hamideh Mehdizadeh [email protected]
Postdoctoral Researcher, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China. Email: [email protected]; [email protected]
Professor, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China (corresponding author). ORCID: https://orcid.org/0000-0002-8276-5212. Email: [email protected]; [email protected]
Xiongfei Cheng [email protected]
Master’s Student, College of Civil Engineering, Hunan Univ., Changsha, Hunan 410082, China. Email: [email protected]
Assistant Professor, Dept. of Bioenvironmental Systems Engineering, National Taiwan Univ., Taipei 10617, Taiwan. ORCID: https://orcid.org/0000-0003-2082-4077. Email: [email protected]
Senior Lecturer, Dept. of Civil Engineering, Faculty of Engineering, Univ. of Malaya, Kuala Lumpur 50603, Malaysia. ORCID: https://orcid.org/0000-0001-5122-8839. Email: [email protected]

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