Investigation of microstructural damage in shotcrete under a freeze–thaw environment

Chen, Jianxun; Deng, Xianghui; Luo, Yanbin; Lin, He; Q, Liu; Xiong, Qiao

doi:10.1016/j.conbuildmat.2015.02.042

Cited by 59 publications

(15 citation statements)

References 11 publications

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“…Upon reaching the 100th F-T cycle, the pores with areas of 0-0.5mm 2 increased, which indicated the large pores may be ruptured and cut-through by cracks, thereby, the great number of small pore emerged. These results were matched with test results reported in the research (Chen et al, 2015).…”

Section: Frequency Distribution Of Pore Areasupporting

confidence: 78%

“…Ng et al (2014) carried out research on internal frost damage in cementations materials with micromechanics analysis. Chen et al (2015) studied the concrete durability performance under F-T actions by CT test. Based on CT scanning, Promentilla et al (2010) investigated the micro-pore distribution of different types of cement mortar after F-T cycles by image processing.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Damage in Concrete Suffered Freeze-Thaw Cycles by CT Technique

Tian

Han

2016

ACT

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The evolution and spatial distribution of internal random pore structure are key factors in damage mechanism and macro-mechanical properties of concrete material under freeze-thaw (F-T) environment. This paper was presented to discover the deterioration mechanism of concrete under F-T actions. Through the experiment, visual examination was employed to evaluate the surface damage; the degradation considering the mass loss and uniaxial compressive strength of concrete was statistically analyzed under F-T environment. Moreover, X-ray tomography was adopted to characterize the concrete internal structure subjected to F-T cycles. The specimens exposed to F-T environment were scanned at regular intervals. Coupled with CT test, the pore space was characterized in terms of porosity and pore distribution by image analysis. And the relationship between the pore structure and the F-T cycles was described quantitatively by the fractal theory. The results indicated that the fractal dimension of the pore structure presented "down-up" trend with the number of F-T cycles increasing. The pore structure evolution changed from chaos to order and then to a process of disorder. The results demonstrated that F-T cycles accelerated the generation of meso-damage in concrete, which leads to more severe damage under F-T cycles.

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Section: Frequency Distribution Of Pore Areasupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage in Concrete Suffered Freeze-Thaw Cycles by CT Technique

Tian

Han

2016

ACT

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“…is phenomenon was also reported by Chen et al [30] and can be explained by the fact that the interface transition zone is the weak part in the concrete as demonstrated by Vargas et al [31].…”

Section: Results and Analysis Of Mesoscopic Ct Testsupporting

confidence: 68%

Bond Behavior of Reinforcing Steel Bars in Thermal Insulation Concrete Exposed to Freeze-Thaw Cycles

Zhou

Liu

et al. 2019

Advances in Materials Science and Engineering

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An experimental study on the bond behavior of reinforcing steel bars in thermal insulation concrete (TIC) mixed with glazed hollow beads (GHBs) and exposed to freeze-thaw (F-T) cycles was carried out. In order to investigate the effects of GHBs on freezing and thawing, the experimental results were compared with those of normal concrete (NC). e comparison shows that, after 300 F-T cycles, both bond behavior and mechanical properties of the TIC specimens are better than those of the NC specimens. Furthermore, in order to investigate the mechanism of frost effect on TIC, the CT scanning method was used to investigate the evolution of the inner structure of a TIC specimen exposed to F-T cycles. e CT images show that the deterioration of bond performance and mechanical properties of the TIC specimen appears to be caused by the increase of micropores in the TIC.

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“…With less energy for microcracks propagation, the strain‐rate effect declined. (b) With the repeated action of the freeze–thaw cycling, a remarkable increase in the porosity and pore size of the concrete is due to pore hydraulic pressure . The rapid development of pores and microcracks decreased the bonding of aggregate–mortar interface.…”

Section: Resultsmentioning

confidence: 99%

“…(b) With the repeated action of the freeze-thaw cycling, a remarkable increase in the porosity and pore size of the concrete is due to pore hydraulic pressure. [33][34][35] The rapid development of pores and microcracks decreased the bonding of aggregatemortar interface. Thus, the cracks tended to propagate along the interfaces instead of across aggregates, leading to the decline of strain-rate sensitivity.…”

Section: Dynamic Increase Factor and Strain-rate Effectsmentioning

confidence: 99%

Experimental study on the dynamic mechanical properties of concrete under freeze–thaw cycles

Han

Tian

2018

Structural Concrete

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This study investigated the dynamic mechanical properties of concrete subjected to freeze–thaw cycles. Freeze–thaw cycle experiments were carried out using a freeze–thaw tester to vary the temperature from 20 ± 2 °C to −20 ± 2 °C, from 0 to 100 cycles. Uniaxial compression tests were performed with a tested strain rate ranging from 1.0 × 10−5/s to 1.0 × 10−2/s using a servo‐hydraulic testing machine. Dynamic compressive strengths were measured and the effects of freeze–thaw cycles and strain rates were investigated. The experimental results suggested that the dynamic compressive strength of specimens generally decreased as the number of freeze–thaw cycles increased, and the dynamic compressive strength was significantly affected by strain rates. The dynamic compressive strength of concrete and the dynamic increase factor both increased with increased strain rate. X‐ray computed tomography scanning was used to study the strain‐rate effects on internal structure damage in the specimens. Cracks propagated along two different paths, passing along the aggregate–mortar interfaces and passing through the aggregates along the failure surfaces.

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Investigation of microstructural damage in shotcrete under a freeze–thaw environment

Cited by 59 publications

References 11 publications

Evaluation of Damage in Concrete Suffered Freeze-Thaw Cycles by CT Technique

Evaluation of Damage in Concrete Suffered Freeze-Thaw Cycles by CT Technique

Bond Behavior of Reinforcing Steel Bars in Thermal Insulation Concrete Exposed to Freeze-Thaw Cycles

Experimental study on the dynamic mechanical properties of concrete under freeze–thaw cycles

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