Materials Reports  2020, Vol. 34 Issue (Z2): 618-622 |
| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Influence of Composite Expansive Agent and Fiber on the Performance of Concrete |
| LU Jingyu1, WANG Lin1, YONG Han1, WANG Peixun2, LI Chao2
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1 College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 102616, China
2 China Railway ERJU 4th Engineering Co.,LTD, Chengdu 610300, China |
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Abstract The study is based on the construction project of Universal Studios metro station along the east of Beijing Metro Line 7, to explore the best mix proportion of HCSA expansion agent and polypropylene fiber when they are mixed together and the influence of the mixture on the performance of reinforced concrete one-way slab. According to the orthogonal design method, the dosage of HCSA expansion agent is 6%, 8%, 10%, 12% and 14% respectively, and the dosage of polypropylene fiber is 0.6 kg/m3, 0.9 kg/m3, 1.2 kg/m3, 1.5 kg/m3 and 1.8 kg/m3 respectively. The best mix proportion and the effects on the concrete slab performance are studied. The results show that when HCSA expansion agent content is 10% and polypropylene fiber content is 0.9 kg/m3, the shrinkage of concrete can be effectively compensated, the 28 d compressive strength of concrete increase 12.6%, the 14 d flexural strength increase 23.2%, and the 14 d limited expansion rate underwater is 3.2×10-4. In the concrete slab, the ultimate bearing capacity of reinforced concrete slab is increased by 3.8% and the deflection is increased by 51.2% when the concrete cracks. The mix of expansive agent and fiber can improve the stress distribution, the ultimate bearing capacity and flexural property of concrete slab.
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Published: 08 January 2021
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| Fund:This work was financially supported by the Fundamental Research Fund for Beijing University of Civil Engineering and Architecture (ZF15063), Science and Technology Project Fund of Ministry of Housing and Urban Rural Development (2015-K4-025), Doctoral Foundation of Beijing University of Civil Engineering and Architecture (ZF14038). |
| About author:: Jingyu Lu is a postgraduate studying in College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, taking construction materials engineering as major. Lin Wang received his master's degree in Tsinghua University and Ph.D. degree in materials science and engineering from the China University of Mining and Technology Beijing. He is teaching at Beijing University of Civil Engineering and Architecture and has published more than 10 journal papers as the first author,applied 3 invention patents. His research interests focus on the cement material. |
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