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Open AccessArticle

Enhancing Functionality of Epoxy–TiO2-Embedded High-Strength Lightweight Aggregates

1
Department of Physics, Kyonggi University, Suwon, Gyeonggi-do 16227, Korea
2
Department of Architectural Engineering Graduate School, Kyonggi University, Suwon, Gyeonggi-do 16227, Korea
*
Authors to whom correspondence should be addressed.
Polymers 2020, 12(10), 2384; https://doi.org/10.3390/polym12102384
Received: 27 August 2020 / Revised: 12 October 2020 / Accepted: 12 October 2020 / Published: 16 October 2020
(This article belongs to the Section Polymer Applications)
With the increasing trend of high-rise, large-scale, and functional modern architectural structures, lightweight aggregate (LWA) concrete that exhibits excellent strength and high functionality has garnered active research attention. In particular, as the properties of concrete vary considerably with the raw materials and the proportions of aggregates in the mix, in-depth research on weight reduction, strength improvement, and functional enhancements of aggregates is crucial. This study used the negative pressure coating of a mixed solution comprising epoxy (mixture of epoxy resin and crosslinker), hyper-crosslinked polymer, and titanium oxide (TiO2) nanoparticles on the LWA, and achieved an improvement in the strength of the LWA as well as a reduction in air pollutants such as NOx and SOx. Compared to a normal LWA with an aggregate impact value (AIV) of 38.7%, the AIV of the proposed epoxy–TiO2-embedded high-strength functional LWA was reduced by approximately half to 21.1%. In addition, the reduction rates of NOx and SOx gases resulting from the photocatalytic properties of TiO2 nanoparticles coated with epoxy were approximately 90.9% and 92.8%, respectively. Epoxy–TiO2, embedded in LWAs through a mixture, exhibited stability, high strength, and a reduction in air pollutant characteristics, despite repeated water washing. The LWA proposed herein offers excellent structural and functional properties and is expected to be used in functional lightweight concrete that can be practically applied in high-rise and large-scale architectural structures. View Full-Text
Keywords: epoxy–titanium oxide-embedded; high-strength lightweight aggregates; NOx and SOx reduction epoxy–titanium oxide-embedded; high-strength lightweight aggregates; NOx and SOx reduction
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MDPI and ACS Style

Lim, T.; Lee, J.H.; Mun, J.-H.; Yang, K.-H.; Ju, S.; Jeong, S.-M. Enhancing Functionality of Epoxy–TiO2-Embedded High-Strength Lightweight Aggregates. Polymers 2020, 12, 2384.

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