Comparative Study of Different Cement-Based Inorganic Pastes towards the Development of FRIP Strengthening Technology
Publication: Journal of Composites for Construction
Volume 18, Issue 3
Abstract
The development of fiber-reinforced inorganic polymer (FRIP) composites for strengthening reinforced concrete (RC) structures has become an active field of research in recent years. Compared with fiber-reinforced polymer (FRP) strengthening systems, a FRIP strengthening system possesses improved fire resistance but its performance depends largely on appropriate inorganic paste selection. This paper presents a comparative study of four typical inorganic pastes, made from the following: (1) magnesium phosphate cement (MPC), (2) magnesium oxychloride cement (MOC), (3) geopolymer (GP) cement (i.e., alkali-activated slag cement), and (4) polymer-modified mortar (PMM). The aim was to investigate their performance both as a matrix and bonding adhesive for FRIP strengthening systems. The evaluated performance included the workability and mechanical properties of inorganic pastes, the bonding strength of these pastes with both a concrete substrate and dry fiber sheets, the tensile properties of the formed FRIP composites, and the flexural strength of FRIP-strengthened concrete beams. The microstructures of the four types of inorganic matrix and the fiber-to-matrix interface were also examined. The MPC-based and MOC-based inorganic pastes exhibit similar structural performance as commercially available PMM and are well-suited for the development of FRIP strengthening technology. Geopolymer seems to be the most brittle among the four studied inorganic pastes.
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Acknowledgments
The writers are grateful for the financial support received from the Research Grants Council of the Hong Kong SAR (project number PolyU 514311), National Natural Science Foundation of China (project code 51172146), as well as the research fund supported by Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, through project GDDCE 12-03. The second writer also acknowledges the Ph.D. studentship awarded by Hong Kong Polytechnic University.
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Published In
Journal of Composites for Construction
Volume 18 • Issue 3 • June 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 10, 2013
Accepted: Jul 22, 2013
Published online: Jul 24, 2013
Discussion open until: Apr 27, 2014
Published in print: Jun 1, 2014
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