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Materials 2019, 12(3), 529; https://doi.org/10.3390/ma12030529

Application of Crumb Rubber in Cement-Matrix Composite

Department of Applied Chemistry, National Chia Yi University, No.300 Syuefu Rd. Chiayi City 60004, Taiwan
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Received: 17 December 2018 / Revised: 6 February 2019 / Accepted: 8 February 2019 / Published: 10 February 2019
(This article belongs to the Special Issue Recent Advances in Rubber Recycling)
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Abstract

Many studies have used rubber as an additive to form a cement-matrix composite (rubcrete). However, rubcrete has a lower mechanical strength than standard concrete. To improve the properties of rubcrete, this study performed surface modifications on crumb rubber through a partial oxidization reaction. The optimal ratio of air to nitrogen was determined by experiments to be 1:4. Fourier transform infrared spectroscopy (FT-IR) was used to identify the functional groups on the surface of the crumb rubber. A colloidal probe of calcium silicate hydrate (C–S–H) was prepared, and the intermolecular interactions between the rubber and the C–S–H were measured using an atomic force microscope (AFM). The experimental results showed that the partially oxidized crumb rubber contained more hydrophilic S–O bonds. The intermolecular force between C–S–H and treated rubber increased by 23% compared to the force between the original rubber and C–S–H. The compressive strength of the hardened cement paste (56 days) with the treated crumb rubber increased 50% in comparison with that of the hardened cement paste with the as-received crumb rubber. View Full-Text
Keywords: partial oxidation; crumb rubber; rubcrete; waste tires; recycling; AFM partial oxidation; crumb rubber; rubcrete; waste tires; recycling; AFM
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chen, C.-Y.; Lee, M.-T. Application of Crumb Rubber in Cement-Matrix Composite. Materials 2019, 12, 529.

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