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Article

Development of Waste-Based Alkali-Activated Cement Composites

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Department of Materials Engineering, Faculty of Engineering, University of Pannonia, H-8201 Veszprém, Hungary
2
Sustainability Solutions Research Lab, Faculty of Engineering, University of Pannonia, H-8201 Veszprém, Hungary
*
Author to whom correspondence should be addressed.
Academic Editor: Katalin Balazsi
Materials 2021, 14(19), 5815; https://doi.org/10.3390/ma14195815
Received: 27 August 2021 / Revised: 24 September 2021 / Accepted: 30 September 2021 / Published: 5 October 2021
(This article belongs to the Special Issue Women in Science: Materials Science and Engineering)
Nowadays, global warming and the ensuing climate change are one of the biggest problems for humanity, but environmental pollution and the low ratio of waste management and recycling are not negligible issues, either. By producing alkali-activated cements (AACs), it is possible to find an alternative way to handle the above-mentioned environmental problems. First, with a view to optimizing experimental parameters, metakaolin-based AACs were prepared, and in it, waste tire rubber was used as sand replacement (5–45 wt %). Insufficient wetting between the rubber particles and the matrix was corrected through different surface treatments of the rubber. For improving the mechanical/strength properties of the specimens, fibrous waste kaolin wool (0.5–1.5 wt %) was added to the AAC matrix. Considering the results of model experiments with metakaolin, blast-furnace-slag-based AAC composites were developed. The effects of storage conditions, specimen size and cyclic loading on the compressive strength were investigated, and the resulting figures were compared with the relevant values of classic binders. The strength (44.0 MPa) of the waste-based AAC composite significantly exceeds the required value (32.5 MPa) of clinker saving slag cement. Furthermore, following cyclic compressive loading, the residual strength of the waste-based AAC composite shows a slight increase rather than a decrease. View Full-Text
Keywords: alkali-activated cement; composite materials; waste rubber; fibre reinforcement; mechanical properties; rubber surface treatment; cyclic loading; scanning electron microscopy; FT-IR spectroscopy; computed tomography alkali-activated cement; composite materials; waste rubber; fibre reinforcement; mechanical properties; rubber surface treatment; cyclic loading; scanning electron microscopy; FT-IR spectroscopy; computed tomography
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MDPI and ACS Style

Boros, A.; Varga, C.; Prajda, R.; Jakab, M.; Korim, T. Development of Waste-Based Alkali-Activated Cement Composites. Materials 2021, 14, 5815. https://doi.org/10.3390/ma14195815

AMA Style

Boros A, Varga C, Prajda R, Jakab M, Korim T. Development of Waste-Based Alkali-Activated Cement Composites. Materials. 2021; 14(19):5815. https://doi.org/10.3390/ma14195815

Chicago/Turabian Style

Boros, Adrienn, Csilla Varga, Roland Prajda, Miklós Jakab, and Tamás Korim. 2021. "Development of Waste-Based Alkali-Activated Cement Composites" Materials 14, no. 19: 5815. https://doi.org/10.3390/ma14195815

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