Stress-Strain Relationship of Frost-Damaged Concrete Subjected to Fatigue Loading

Hasan, Muttaqin; Ueda, Tamon; Sato, Yoshiaki

doi:10.1061/(asce)0899-1561(2008)20:1(37)

Cited by 85 publications

(38 citation statements)

References 6 publications

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“…It is clear that there are compressive strains when the temperature is decreasing, while concrete expands when the temperature is increased. This behaviour is in accordance with the theories that explain this phenomenon and with results of many researchers (37)(38)(39)(40).…”

Section: Strain Measurementsupporting

confidence: 77%

Complementary testing techniques applied to obtain the freeze-thaw resistance of concrete

Romero¹,

Enfedaque²,

Gálvez³

et al. 2015

Mater. construcc.

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Most of the standards that evaluate the resistance of concrete against freeze-thaw cycles (FTC) are based on the loss of weight due to scaling. Such procedures are useful but do not provide information about the microstructural deterioration of the concrete. The test procedure needs to be stopped after several FTCs for weighing the loss of material by scaling. This paper proposes the use of mercury-intrusion-porosimetry and thermogravimetric analysis for assessing the microstructural damage of concrete during FTCs. Continuous strain measurement can be performed without stopping the FTCs. The combination of the above techniques with the freeze-thaw resistance standards provides better and more precise information about concrete damage. The proposed procedure is applied to an ordinary concrete, a concrete with silica fume addition and one with an air-entraining agent. The test results showed that the three techniques used are suitable and useful to be employed as complementary to the standards. RESUMEN: Resistencia del hormigón frente a ciclos hielo deshielo medida con técnicas complementarias.Las normas para evaluar la resistencia del hormigón a los ciclos hielo-deshielo (CHD) se basan habitualmente en la pérdida de peso por descascarillamiento. Son útiles, pero no proporcionan información sobre el deterioro microestructural del hormigón. Además, exigen detener el ensayo para pesar el material desprendido. Se propone el uso complementario de la porosimetría por intrusión de mercurio y el análisis termogravimétrico para evaluar el daño microestructural del hormigón durante los CHDs. La medida continua de las deformaciones puede hacerse sin detener los CHDs. La combinación de las técnicas enumeradas con las normas de ensayo proporciona información más completa sobre el daño del hormigón. El procedimiento propuesto se aplica a un hormigón convencional, a un hormigón con adición de humo de sílice y a otro con aireante. Los resultados de los ensayos mostraron que las tres técnicas usadas son útiles y adecuadas como complemento a las establecidas en las normas.

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Section: Strain Measurementsupporting

confidence: 77%

Complementary testing techniques applied to obtain the freeze-thaw resistance of concrete

Romero¹,

Enfedaque²,

Gálvez³

et al. 2015

Mater. construcc.

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“…The causes and mechanisms of F-T external deterioration have been investigated in some research. The stress-strain stiffness degradation model of concrete subjected to the influence of F-T cycles was obtained (Hasan et al 2008). This mechanism impacted the stress-strain relation in compression and tension, as well as compressive and fracture energy, in damage regions (Kim et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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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“…Although there are other indexes to evaluate the frost damage (pore structure change, permeability change and so on), according to this study, the mechanical parameters are more obvious and easy to be used. In addition, Hasan et al (2004Hasan et al ( , 2008 has demonstrated that the residual deformation can be a good index because it can link other variables (stiffness, strength and so on) satisfactorily, and according to the authors' previous studies Gong et al 2013), the residual deformation has a close relation with the maximum tensile strain (caused by the maximum volume expansion), which occurs at the lowest temperature. The authors' studies also show that the tensile strain is developed suddenly by supercooling and increases further as temperature decreases until the lowest temperature.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Simulation of Deformation for Mortar and Concrete under Cyclic Freezing and Thawing Stress

Gong

Wang

Zhang

et al. 2015

ACT

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As one kind of porous medium, even without external loading, concrete material is still possible to be damaged by the internal pore pressures, such as hydraulic, crystallization and cryosuction pressures during freezing and thawing cycles (FTC). In this paper, a mesoscale model using Rigid Body Spring Method (RBSM) is developed to simulate the deformation behaviors of concrete under FTC cycles. On one hand, the macroscopic material is divided into small rigid elements of mesoscale; on the other hand, the microscale internal pore pressures are regarded as average values in mesoscale based on poromechanical theories. The constitutive relation is also developed to reflect deformation compatibility between porous body and ice-water system. Finally, the internal cracking and residual deformation are simulated for mortar and concrete using RBSM, which are found in a good agreement with previous experimental data.

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Stress-Strain Relationship of Frost-Damaged Concrete Subjected to Fatigue Loading

Cited by 85 publications

References 6 publications

Complementary testing techniques applied to obtain the freeze-thaw resistance of concrete

Complementary testing techniques applied to obtain the freeze-thaw resistance of concrete

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

Mesoscale Simulation of Deformation for Mortar and Concrete under Cyclic Freezing and Thawing Stress

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