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Materials 2016, 9(7), 527; doi:10.3390/ma9070527

Influence of Rubber Size on Properties of Crumb Rubber Mortars

Department of Civil Engineering, Tianjin University, Tianjin 300350, China
Key Laboratory of Coast Civil Structure Safety, Tianjin University, Ministry of Education, Tianjin 300072, China
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 18 June 2016 / Revised: 24 June 2016 / Accepted: 27 June 2016 / Published: 29 June 2016
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Studies on the properties and applications of rubber cement-based materials are well documented. The sizes of rubbers used in these materials varied. However, information about the effects of rubber size on the properties of rubber cement-based materials, especially pore structure, mechanical strengths, and drying shrinkage properties, remains limited. Three groups of rubber with major particle sizes of 2–4 mm, 1–3 mm, and 0–2 mm were selected in this study. This paper presents experimental studies on the effects of rubber size on the consistency, fresh density, pore structure, mechanical properties, and drying shrinkage properties of crumb rubber mortars (CRMs). Results demonstrated that the consistency and fresh density of CRMs decreased with the rubber size. As to the pore structure, the total pore volume increased with the decrease of the rubber size. By contrast, the influence of the rubber size on the mesopore (<50 nm) volume is not as significant as that of the rubber content. The mechanical properties of CRMs decreased with the rubber size. Low rubber stiffness and large pore volumes, especially those of small sized rubbers, contribute to the reduction of CRMs strength. The drying shrinkage of CRM increases as the rubber size decreases. The influences of rubber size on capillary tension are not significant. Thus, the shrinkage increases with the decrease of rubber size mainly because of its function in the deformation modulus reduction of CRMs. View Full-Text
Keywords: rubber particle size; crumb rubber mortar; pore structure; mechanical properties; drying shrinkage rubber particle size; crumb rubber mortar; pore structure; mechanical properties; drying shrinkage

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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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Yu, Y.; Zhu, H. Influence of Rubber Size on Properties of Crumb Rubber Mortars. Materials 2016, 9, 527.

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