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Advances in Materials Science and Engineering
Volume 2014, Article ID 684207, 7 pages
http://dx.doi.org/10.1155/2014/684207
Research Article

Fatigue Performance and Multiscale Mechanisms of Concrete Toughened by Polymers and Waste Rubber

Bo Chen,1,2 Liping Guo,1,3 and Wei Sun1,3

1School of Materials Science and Engineering, Southeast University, Dongnan Daxue Road No. 2, Nanjing 211189, China
2State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
3Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China

Received 22 April 2013; Revised 8 December 2013; Accepted 15 December 2013; Published 2 January 2014

Academic Editor: Jun Zhang

Copyright © 2014 Bo Chen et al. 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.

Abstract

For improving bending toughness and fatigue performance of brittle cement-based composites, two types of water-soluble polymers (such as dispersible latex powder and polyvinyl alcohol powder) and waste tire-rubber powders are added to concrete as admixtures. Multiscale toughening mechanisms of these additions in concretes were comprehensively investigated. Four-point bending fatigue performance of four series concretes is conducted under a stress level of 0.70. The results show that the effects of dispersible latex powder on bending toughness and fatigue life of concrete are better than those of polyvinyl alcohol powder. Furthermore, the bending fatigue lives of concrete simultaneously containing polymers and waste rubber powders are larger than those of concrete with only one type of admixtures. The multiscale physics-chemical mechanisms show that high bonding effect and high elastic modulus of polymer films as well as good elastic property and crack-resistance of waste tire-rubber powders are beneficial for improving bending toughness and fatigue life of cementitious composites.