Comparative Study on High-Temperature Performance of MPC and BFPMPC
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 11
Abstract
Because a new magnesium phosphate cement (MPC) developed previously for the rapid repair of cement concrete structures has better mechanical properties and bonding properties, the high-temperature properties were further investigated and compared with ordinary MPC in this study. The mechanical properties of MPC, the hydration products, and the high-temperature mechanism were studied and revealed under the calcination conditions of normal [room temperature (20°C)], 70°C, 300°C, 600°C, and 900°C. As the temperature increased, the compressive strength first decreased and then increased with the lowest being at 300°C. Subsequently, analytical methods such as X-ray powder diffraction (XRD), mercury intrusion porosimeter (MIP), Fourier transform infrared spectrometer (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and scanning electron microscope/energy dispersive spectrometer (SEM/EDS) were used to comprehensively characterize the changes in MPC hydration products under high-temperature conditions in order to reveal the mechanism of action. The MIP results showed that the detrimental pores gradually increased up to 300°C. When the temperature reached 600°C, the pores were formed and filled by more crystals, which gradually reduced the harmful pores. XRD, FT-IR, and SEM/EDS results showed that at 300°C, the hydration products did not contain the crystalline struvite but transformed into an amorphous transition state. In particular, basalt fiber–reinforced polymer modified magnesium phosphate cement (BFPMPC) still showed polymer degradation and carbonization. The XRD results were verified by TGA. The hydration products of MPC and BFPMPC at 427°C in the process of amorphous to crystalline transformation were verified by DSC. The proposed MPC materials can be widely applied to the reinforcement and maintenance of key joints of buildings and concrete structures that are prone to fire accidents.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is financially supported by the Fundamental Research Funds for the Central Universities [DUT20JC50 and DUT17RC (3)006] and the National Natural Science Foundation of China (Grant No. 51508137).
Author contributions: Fei Liu contributed to the conceptualization, methodology, writing (original draft), software, and data curation. Baofeng Pan contributed to the supervision and investigation. Changjun Zhou contributed to the writing (review and editing), supervision, visualization, and funding acquisition. Yurou Zhang contributed to the writing (review and editing) and data curation.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 11 • November 2023
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© 2023 American Society of Civil Engineers.
History
Received: Jan 4, 2023
Accepted: Apr 21, 2023
Published online: Aug 31, 2023
Published in print: Nov 1, 2023
Discussion open until: Jan 31, 2024
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