Plain Concrete Prisms Externally Strengthened by CFRP Bonded with Graphene Oxide–Modified Magnesium Phosphate Cement
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 5
Abstract
Graphene oxide (GO)–modified magnesium phosphate cement (MPC) is used as an adhesive to bond carbon fiber–reinforced polymer (CFRP) composites in the formation of MPC-CFRP strengthening materials. The performance of GO-modified MPC paste and the mechanical performance of MPC-CFRP–strengthened concrete prisms are investigated in this paper. Workability and mechanical properties of MPC with different dosages of GO (0.035 wt% and 0.07 wt% by MgO) are tested. The results indicate that GO has negative effects on the fluidity and setting time of MPC. Mechanical properties of MPC are improved by a proper addition of GO. Compared with unstrengthened prisms, bearing capacity and stiffness of strengthened concrete prisms increase with the layers of MPC-CFRP: maximum bearing capacity increased by 372.08%, and stiffness increased by 130.15%, respectively. MPC with the optimal mechanical properties (MPC-GO1) is used as the adhesive to bond CFRP, which forms a new type of strengthening composite and greatly improves the bearing capacity and ductility of plain concrete prisms.
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Acknowledgments
The authors would like to acknowledge the financial support provided by the National Key R&D Program of China—Key Materials and Preparation Technology of High Crack Resistant Ready-Mixed Concrete (Grant No. 2017YFB0310100); the National Natural Science Foundation of China (Grant No. 51678011 and 51908182); and the Beijing Municipal Project for Training Tens of Millions of Talent (Grant No. 2018A37).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 5 • May 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jan 27, 2019
Accepted: Sep 23, 2019
Published online: Feb 18, 2020
Published in print: May 1, 2020
Discussion open until: Jul 18, 2020
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