Impact of natural weathering on medium-term self-healing performance of fiber reinforced cementitious composites with intrinsic crack-width control capability |
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| Affiliation: | 1. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;2. Nanjing Hydraulic Research Institute, Nanjing 210024, China;1. Department of Building, National University of Singapore, 4 Architecture Drive, 117566, Singapore;2. Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore;1. School of Architecture and Built Environment, Faculty of Engineering and Build Environment, The University of Newcastle, University Drive, Callaghan, NSW 2287, Australia;2. School of Engineering, Faculty of Engineering and Build Environment, The University of Newcastle, University Drive, Callaghan, NSW 2287, Australia;3. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China |
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| Abstract: | The paper investigates the medium-term self-healing performance of fiber reinforced cementitious composites with intrinsic crack-width control capability under natural weathering. The pre-cracked specimens with different damage levels are exposed to various humidity conditions, namely, water submersion, natural weathering, and a laboratory environment with constant humidity. The medium-term self-healing performance is evaluated using a resonant frequency test, tensile test, SEM, and EDX. It is concluded that the medium-term cracked specimens can moderately recover their mechanical properties within 90 days after being submerged in water or exposed to natural weathering. In particular, they are able to resume the multiple cracking behavior and exhibit a reloading strength larger than the preloading strength. Furthermore, the identified compositions of the medium-term healing products for specimens exposed to water and natural weathering conditions are similarly characterized. The reported results imply that effective medium-term self-healing can be realized in fiber reinforced cementitious composites with intrinsic crack-width control capability under natural weathering. |
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| Keywords: | Self-healing Fiber reinforced concrete Mechanical behavior Natural weathering Non-destructive testing |
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