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Structural Monitoring and Maintenance Volume 8, Number 3, September 2021 , pages 279-294 DOI: https://doi.org/10.12989/smm.2021.8.3.279 |
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Monitoring the required energy for the crack propagation of fiber-reinforced cementitious composite |
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Sajjad Mirzamohammadi and Moosa Mazloom
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| Abstract | ||
| In this paper, the results of experimental work on the required energy for the crack propagation (fracture energy), rupture modulus and compressive strength of fiber-reinforced cementitious composite (FRCC) with different types of fibers after exposure to 20°C, 100°C and 300°C are investigated. The experimental part of the work is divided into the following stages: the effects of sub-elevated temperatures and fiber types on the fracture and mechanical behaviors of FRCC; finding a relation between the fracture energy and mechanical properties of the specimens based on I-optimal design of response surface methodology (RSM-I-optimal). Specifically, the analysis of variance (ANOVA) was examined to evaluate the influences of compressive strength and rupture modulus on the required energy for the crack propagation. For this purpose, three monotype fiber reinforced mixes have been prepared. The utilized fibers were aramid, basalt and glass. Additionally, the predictive efficiency of the RSM model was studied based on the normalized goodness-of-fit statistics (Nash & Sutcliffe coefficient of efficiency, NSE). The main finding was that both compressive strength and rupture modulus had considerable influences on the fracture energy. However, the effect of rupture modulus was far greater than compressive strength. In terms of NSE value, the model predictive efficiency was good for fracture energy. | ||
| Key Words | ||
| monotype fibers; analysis of variance; rupture modulus; crack propagation; fracture energy | ||
| Address | ||
| (1) Sajjad Mirzamohammadi: Department of structural Engineering, Tarbiat Modares University, Tehran, Iran; (2) Moosa Mazloom: Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran. | ||
