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Published in: Journal of Material Cycles and Waste Management 1/2021

18-09-2020 | ORIGINAL ARTICLE

A novel humidity regulating material hydrothermally synthetized from concrete waste

Authors: Jiajun Miao, Zhenzi Jing, Hongyuan Fan, Haoran Lan, Deping Wang

Published in: Journal of Material Cycles and Waste Management | Issue 1/2021

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Abstract

To promote the recycling of construction wastes, a low temperature (≤ 200 ℃) hydrothermal technology for solidifying construction (concrete) waste into a tough and humidity self-regulating material has been developed, in which more than 60% of concrete waste could be recycled. During the process, the whole concrete waste including aggregates could be converted hydrothermally into tobermorite or C–S–H. The formed tobermorite could not only enhance the strength but also improve the porosity and thus enhance the humidity regulating capability. The maximum flexural strength reached up to 22 MPa, and the increased porosity could provide a good moisture adsorption/desorption performance (170 g/m2). With the addition of sepiolite, the performance could be further improved (250 g/m2) due to the coexistence of the formed tobermorite and remained sepiolite. The materials also exerted a remarkable damping effect on relative humidity (RH) variation indoors, e.g., the RH variation even could be decreased to 1/3 compared to that of empty reference (no humidity regulating materials were used).

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Appendix
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Metadata
Title
A novel humidity regulating material hydrothermally synthetized from concrete waste
Authors
Jiajun Miao
Zhenzi Jing
Hongyuan Fan
Haoran Lan
Deping Wang
Publication date
18-09-2020
Publisher
Springer Japan
Published in
Journal of Material Cycles and Waste Management / Issue 1/2021
Print ISSN: 1438-4957
Electronic ISSN: 1611-8227
DOI
https://doi.org/10.1007/s10163-020-01110-6

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