Abstract
This study evaluates the effect of vehicle–bridge coupled vibration on the mechanical properties of fiber-reinforced magnesium phosphate cement (FR-MPC) composites and the bonding properties of repaired systems. By means of compressive and flexural bond strengths, fiber pullout, mercury intrusion porosimeter (MIP) and backscattered electron imaging (BSE) analysis, an enhanced insight was gained into the evolution of FR-MPC performance before and after vibration. Experimental results showed that the compressive strength and flexural strength of FR-MPC was increased when it was subjected to vibration. However, the effects of vibration on the flexural strength of plain magnesium phosphate cement (MPC) mortars was insignificant. The increased flexural strength of FR-MPC after vibration could be due to the high average bond strength and pull-out energy between the micro-steel fiber and the MPC matrix. Moreover, BSE analysis revealed that the interface structure between FR-MPC and an ordinary Portland cement (OPC) substrate was more compacted after vibration, which could possibly be responsible for the better bonding properties of FR-MPC. These findings are beneficial for construction project applications of FR-MPC in bridge repairing and widening.
Highlights
Hong et al [7] found that coupled vibration occurring within the first hour of casting exerts a considerable adverse effect both on the compressive strength of the repair materials, and the bond strength between the repair materials and the damaged structure
The development of compressive and flexural strength of plain magnesium phosphate cement (MPC) mortars at 1 h, 3 days
This indicates that 85% strength of the MPC after 3 days was achieved during the h and dayshigh are early presented in Figures and 8. enable
Summary
Under the joint effect of heavy traffic loads and harsh environmental conditions, concrete bridges face the problem of being degraded or even damaged [1,2,3,4]. Due to an increase in population and number of vehicles, many existing bridges may be widened to carry more loads and support transportation [5,6]. Under open traffic construction conditions, the vibration of old bridge decks caused by vehicles affects the newly placed repair materials of adjacent lanes [8,9,10]. A study by Jiang et al [11] showed that coupled vibration of a vehicle and bridge can lead to propagation of numerous micro-cracks and other defects in the concrete during the setting and the hardening period. Determining how to ensure the early performance of repair materials to minimize the negative impact of vibration on the repaired system has become a key issue
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
