Mechanical and Antibacterial Behavior of Photocatalytic Lightweight Engineered Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 10
Abstract
In recent years, there has been increasing interest in using cementitious materials as a catalyst-supporting media such as air-purifying paving block, self-cleaning exterior wall, and photocatalytic ceiling panel. Despite many works on photocatalytic cementitious materials, most of them were focused on the application of cement mortars. Little work has been done on the development of photocatalytic functionalities on highperformance fiber-reinforced cementitious composite (HPFRC). Engineered cementitious composites (ECCs), a class of HPFRC, have been used in a wide range of full-scale applications, from sprayed ECC for dam retrofitting to lightweight building facade and bridge deck pavement. In this work, titanium dioxide () was incorporated into lightweight ECC. The influence of and different lightweight ingredient materials on mechanical properties and antibacterial behavior based on Escherichia coli (E. coli) was investigated. Two types of lightweight aggregates were evaluated: fly ash cenospheres (FACs) and glass bubbles K-1. Furthermore, an air-entraining agent (AEA) was also evaluated to induce air bubbles to achieve lightweight ECC. The use of a glass bubble is preferable to achieve lightweight ECC with a density of around (60% lower than normal ECC) while maintaining a tensile strain capacity of more than 3% with moderate tensile strength. At the same time, lightweight ECC using glass bubbles show the smallest number of viable bacteria after 240 min of ultraviolet (UV)/visible light exposure. The smallest number of viable bacteria indicates it has the highest antibacterial activity among lightweight ECC materials. The use of glass bubble significantly alters the pore structure of lightweight ECC, which improves the access to irradiate particle. The incident photon could pass along the pore to activate more particles for the photocatalytic process.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This study was supported by the Academic Research Fund (AcRF) Tier 1 from the Ministry of Education, Singapore (Grant No. RG87/15) and the Nanyang Technological University (NTU) Research Scholarship to the first author.
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Journal of Materials in Civil Engineering
Volume 33 • Issue 10 • October 2021
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© 2021 American Society of Civil Engineers.
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Received: May 18, 2020
Accepted: Feb 10, 2021
Published online: Jul 21, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 21, 2021
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