Facile synthesis of novel dopamine-modified glass fibers for improving alkali resistance of fibers and flexural strength of fiber-reinforced cement |
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| Authors: | Pengfei Ma Minglian Xin Yan Zhang Shenguang Ge Dan Wang Congcong Jiang Lina Zhang Xin Cheng |
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| Institution: | Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022 Shandong China.; Shandong Hi-speed Road & Bridge International Engineering Co. Ltd., Jinan 250014 Shandong China ; School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022 Shandong China ; Institute for Advanced Interdisciplinary Research, University of Jinan, Jinan 250022 Shandong China |
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| Abstract: | Glass fiber-reinforced cementitious material is one of the significant components in structural materials playing vital roles in enhancing the tensile and flexural behavior of cement-based quasi-brittle materials. Compared with carbon and polymer fibers, its intrinsic similar silicate-based composition to cement was endowed with better bonding properties and compatibility with cement-based materials. However, the poor alkali resistance of glass fibers restrained their potential development for spreading to applications in construction fields. In this study, dopamine-modified glass fibers (DP) were self-polymerized at ambient temperature by a facile method for enhancing the alkali resistance of glass fibers. Scanning electron microscopy and X-ray photoelectron spectroscopy were utilized for characterizing DP. The duration of reaction and fiber to solution ratio were adjusted with an optimal reaction time of 12 h and fiber to solution ratio of 0.12 g ml−1 acquired. Alkali resistance was measured by strength retention tests in both mortar and sodium hydroxide solution. Compared with untreated glass fibers (UN), DP exhibited a distinct improvement in strength retention rate of 37.1% and 18.9% under mortar and sodium hydroxide solution environments, respectively. Also, flexural strength tests of DP-reinforced cement were conducted, and its strength was increased in comparison with that of UN-reinforced cement by 58.2%. As a consequence, a novel simple method for improving the alkali resistance of glass fibers was proposed and is anticipated to promote the development and applications of glass-fiber reinforced cement-based materials. In situ modification on fibers: in situ modification of self-polymerized dopamine on glass fibers was adjustably established. Relying on such nanomodification on the surface, a drastic enhancement of alkali resistance of glass fibers could be achieved. |
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