Evaluation of fracture behavior of high-strength hydraulic concrete damaged by freeze-thaw cycle test

Zhu, Xiangyi; Chen, Xudong; Bai, Yanqin; Ning, Yingjie; Zhang, Wei

doi:10.1016/j.conbuildmat.2022.126346

Cited by 45 publications

(8 citation statements)

References 62 publications

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“…This model essentially considers the influences of the effective area of the confined concrete, volumetric ratio, spacing and yield strength of stirrups on the mechanical properties of the confined concrete. Many scholars compared their freeze-thaw test results with the traditional Mander model [25,32,33]. The results suggested that the traditional Mander model is consistent well with the test results.…”

Section: Development Of the Proposed Deterioration Modelmentioning

confidence: 76%

“…The statistical parameters and experimental data of the peak stress of plain concrete listed in Table 1 are drawn in Figure 1. As seen from Figure 1a, the peak stress exhibited an overall downward trend [6,[24][25][26]. When freeze-thaw cycles reached 300, the mean value of the peak stress of C30 concrete decreased by 28.93%.…”

Section: Variation Law Of the Peak Stressmentioning

confidence: 90%

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Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage

et al. 2023

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Freeze–thaw damage is one of the primary causes deteriorating the seismic resistance of reinforced concrete (RC) structures. This paper proposed a freeze–thaw damage deterioration model for C30 concrete, and it can be employed to study the time-varying seismic performance of aging RC columns. Next, this study developed a seismic fragility analysis framework for deteriorating RC columns considering the effect of freeze–thaw damage. Considering the geometric parameters of the case-study bridge, the deterioration characteristics of material, and the uncertainties involved in structural modeling and ground motions, a probabilistic seismic fragility analysis on aging RC columns was conducted. The results indicate that the influence of freeze–thaw damage cannot be ignored in studying the seismic performance of aging RC structures. The seismic fragilities of deteriorating RC columns shown a nonlinear increase trend as the increased of freeze–thaw cycles and severity of the damage state. In the early stage of freeze–thaw cycles, the seismic fragilities of RC columns increased slowly. However, the closer to the later stage of freeze–thaw cycles, the more significant of the increase in the seismic fragilities of the columns.

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Section: Development Of the Proposed Deterioration Modelmentioning

confidence: 76%

Section: Variation Law Of the Peak Stressmentioning

confidence: 90%

Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage

et al. 2023

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“…There will be a certain degree of damage in concrete under the action of freeze–thaw cycles, thus resulting in the changes of the dynamic elastic modulus [ 60 ]. Figure 9 shows the changes of the normalized dynamic elastic modulus with the number of freeze–thaw cycles.…”

Section: Resultsmentioning

confidence: 99%

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Liu

Dou

et al. 2022

Materials

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In order to evaluate the influence of freeze–thaw action on the durability of concrete structures, this paper presentedan experimental study to investigate the effects of freezing–thawing cycles and concrete strength on the bond behavior between steel bars and concrete confined with stirrups. Through freeze–thaw cycles and center pullouttests, the failure mode of pullout specimen, concrete strength, mass loss, dynamic elastic modulus, and bond–slip curves were analyzed. At last, the bond–slip constitutive model was proposed for specimens with stirrup confinement under freeze–thaw action. Main test results indicate that the failure mode and shape of bond–slip curves are affected by stirrups. The bond strength hasa certain increase after 100 freeze–thaw cycles owing to the constraining force from stirrups, whereasthe splitting tensile strengthsignificantly declines. After 100 freeze–thaw cycles, the splitting tensile strength of C20 and C40 decreased by40.8% and 46.5%, respectively. The formula was provided to calculate the bond strength of constrained concrete after freeze–thaw cycles, and the damage coefficient and other related parametersin the formula were suggested. The predicted bond–slip curves are close to the experimental results, which could provide reference for the related research of bond performance after freeze–thaw action.

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“…However, the problems of traditional concrete are becoming increasingly prominent (single function, low tensile strength, and easy fracture), which seriously restrict the development of concrete materials [ 3 , 4 ]. Moreover, under the actions of adverse factors such as environmental changes, external loads, and construction, concrete structures inevitably produce damage accumulation and resistance attenuation damage and even lead to catastrophic accidents [ 5 ]. Therefore, the vulnerable parts of the structure should possess multi-functions (real-time health monitoring [ 6 ], self-regulation [ 7 ], self-protection [ 8 ], and so on), such that as a result, the structure can display early warning signs before major disaster events, which is also a research hotspot for scholars around the world.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Properties and Applications of Carbon Fiber-Reinforced Smart Cement-Based Composites

Hao

Shi

et al. 2023

Materials

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Under the strategies of low-carbon and environmental protection, promoting green technology innovation to achieve carbon neutrality in the construction field has become a universal goal. As the building material with the highest consumption, concrete has gradually begun to transform into a multi-functional and intelligent product. Therefore, the research on carbon fiber-reinforced cement-based composites (CFRCs) is of relative interest. It mainly uses carbon fibers (CFs) with high elasticity, strength, and conductivity to disperse evenly into the concrete as a functional filler, to achieve the intelligent integration of concrete structures and function innovatively. Furthermore, the electrical conductivity of CFRC is not only related to the content of CFs and environmental factors but also largely depends on the uniform dispersion and the interfacial bonding strength of CFs in cement paste. This work systematically presents a review of the current research status of the enhancement and modification mechanism of CFRC and the evaluation methods of CF dispersion. Moreover, it further discusses the improvement effects of different strengthening mechanisms on the mechanical properties, durability, and smart properties (thermoelectric effect, electrothermal effect, strain-sensitive effect) of CFRC, as well as the application feasibility of CFRC in structural real-time health monitoring, thermal energy harvesting, intelligent deformation adjustment, and other fields. Furthermore, this paper summarizes the problems and challenges faced in the efficient and large-scale applications of CFRCs in civil engineering structures, and accordingly promotes some proposals for future research.

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Evaluation of fracture behavior of high-strength hydraulic concrete damaged by freeze-thaw cycle test

Cited by 45 publications

References 62 publications

Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage

Seismic Fragility Assessment of RC Columns Exposed to the Freeze-Thaw Damage

Bond Behavior of Steel Bars in Concrete Confined with Stirrups under Freeze–Thaw Cycles

Recent Advances in Properties and Applications of Carbon Fiber-Reinforced Smart Cement-Based Composites

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