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Influence of damage degree on the degradation of concrete under freezing-thawing cycles
Highlights The influence of damage degree on the degradation of concrete under freezing-thawing cycles was systematically investigated. The mass loss, relative dynamic modulus of elasticity of degraded concrete were measured. The uniaxial compression tests was conducted and stress–strain curves were obtained. The degradation mechanism of damaged concrete under freezing-thawing cycles was discussed.
Abstract The existed studies about the freezing-thawing degradation of concrete mainly focused on non-damaged concrete. This may overestimate the service life of concrete structures. In this paper, the influence of damage degree on the degradation of concrete under freezing-thawing cycles was systematically investigated. The concrete specimens with three different damage degrees (0, 10%, and 20%) of D0, D1, and D2 were prepared. After many freezing-thawing cycles, the mass loss, relative dynamic modulus of elasticity were measured and uniaxial compression tests were conducted. Test results show that the mass of D0 continuously increases with the freezing-thawing cycles before 32, but the mass of D1 and D2 specimens show a negative increase after 16 cycles. The relative dynamic elastic modulus of D1, D2, and D3 showed a decreasing trend. The degradation rate of compressive strength is close to the no-damage concrete when the damage degree is less than 0.1. However, when the damage degree reaches 0.2, the degradation rate of strength accelerates remarkably. The elastic modulus of D0, D1, and D2 specimens decreases linearly with the increase of freezing-thawing cycles. The peak strain varies of D0 specimen change very little before 32 freezing-thawing cycles. For D1 and D2 specimens, the peak strain increases linearly with the increase of freezing-thawing cycles. Finally, the degradation mechanism of concrete with initial damage under the action of freezing-thawing cycles are discussed.
Influence of damage degree on the degradation of concrete under freezing-thawing cycles
Highlights The influence of damage degree on the degradation of concrete under freezing-thawing cycles was systematically investigated. The mass loss, relative dynamic modulus of elasticity of degraded concrete were measured. The uniaxial compression tests was conducted and stress–strain curves were obtained. The degradation mechanism of damaged concrete under freezing-thawing cycles was discussed.
Abstract The existed studies about the freezing-thawing degradation of concrete mainly focused on non-damaged concrete. This may overestimate the service life of concrete structures. In this paper, the influence of damage degree on the degradation of concrete under freezing-thawing cycles was systematically investigated. The concrete specimens with three different damage degrees (0, 10%, and 20%) of D0, D1, and D2 were prepared. After many freezing-thawing cycles, the mass loss, relative dynamic modulus of elasticity were measured and uniaxial compression tests were conducted. Test results show that the mass of D0 continuously increases with the freezing-thawing cycles before 32, but the mass of D1 and D2 specimens show a negative increase after 16 cycles. The relative dynamic elastic modulus of D1, D2, and D3 showed a decreasing trend. The degradation rate of compressive strength is close to the no-damage concrete when the damage degree is less than 0.1. However, when the damage degree reaches 0.2, the degradation rate of strength accelerates remarkably. The elastic modulus of D0, D1, and D2 specimens decreases linearly with the increase of freezing-thawing cycles. The peak strain varies of D0 specimen change very little before 32 freezing-thawing cycles. For D1 and D2 specimens, the peak strain increases linearly with the increase of freezing-thawing cycles. Finally, the degradation mechanism of concrete with initial damage under the action of freezing-thawing cycles are discussed.
Influence of damage degree on the degradation of concrete under freezing-thawing cycles
Zhang, Wenhua (author) / Pi, Yilin (author) / Kong, Weipeng (author) / Zhang, Yunsheng (author) / Wu, Peipei (author) / Zeng, Weizhao (author) / Yang, Fenghao (author)
2020-06-06
Article (Journal)
Electronic Resource
English
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