Experimental study of micro/macro crack development and stress–strain relations of cement-based composite materials at elevated temperatures

Fu, Y.F.; Wong, Yi Lin; Poon, Chi Sun; Tang, Chun’an; Lin, Peng

doi:10.1016/j.cemconres.2003.08.029

Cited by 146 publications

(62 citation statements)

References 6 publications

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“…On the other hand, the tangential cracks develop at the inclusion/matrix interface when the CTE of inclusion is lower than of the matrix. The radial cracks occur when the temperature is above 150°C, while the tangential cracks occur when the temperature is below 150°C [6,37,39]. Figure 4 shows a beginning of radial cracks in the cement paste heated to 120°C which suggesting that the CTE of aggregates becomes close to or greater than that of the paste.…”

Section: Degraded Samplesmentioning

confidence: 99%

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Tensile and shear bond strength between cement paste and aggregate subjected to high temperature

et al. 2017

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In the framework of studying the leakage rate of concrete containment of nuclear power plants during an accident, the mechanical characterization of interface between cement paste and limestone aggregate was performed with mechanical tests at the local scale, inside the laboratory of micromechanics and integrity of structures (MISt). The evolution of tensile and shear bond strength between cement paste and aggregate after heating was determined. It was revealed that the tensile bond strength was strongly affected by the temperature rise, with a decrease of about 71% at 60°C. Moreover, the shear bond strength increased almost linearly with the increase of normal stress. According to the Coulomb criterion, the cohesion and the internal friction angle were determined. These parameters decreased after heating, which indicates occurrence of thermic damage between cement paste and limestone aggregate. Finally, it appears that the tensile bond strength is more affected by the thermal damage than the shear bond strength.

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Section: Degraded Samplesmentioning

confidence: 99%

“…The CTE of cement paste decreases when temperature increases [6,36]. This difference in coefficient of thermal expansion causes differential deformations (thermal mismatch mechanism), which induce a system of internal stresses leading to tangential cracks [37] as shown in Fig. 4.…”

Section: Degraded Samplesmentioning

confidence: 99%

Tensile and shear bond strength between cement paste and aggregate subjected to high temperature

et al. 2017

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“…The elastic modulus and tensile strength of a cement paste element are reduced with the maximum temperature reached in that element following the experimental results of Fu et al (2004) obtained on thin cement paste samples with a water/cement ratio of 0.5 (see Fig. 16).…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Young's modulus Tensile strength Fig. 16 Evolution of the Young's modulus and tensile strength of the cement paste as a function of the maximum temperature reached in an element, following experimental results by Fu et al (2004).…”

Section: Materials Propertiesmentioning

confidence: 99%

Combined Effects of Temperature and Irradiation on Concrete Damage

Pape

Giorla

Sanahuja

2016

ACT

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Aggregate radiation-induced volumetric expansion (RIVE) is a predominant mechanism in the formation of mechanical damage in the hardened cement paste (hcp) of irradiated concrete under fast-neutron flux . Among the operating conditions difference between test reactors and light water reactors (LWRs), the difference of irradiation flux and temperature is significant. While a temperature increase is quite generally associated with a direct, or indirect (e.g., by dehydration) loss of mechanical properties , it causes a partial annealing of irradiation amorphization of α-quartz, hence, reducing RIVE rate. Based on data collected by Bykov et al. (1981), an incremental RIVE model coupling neutron fluence and temperature is developed. The elastic properties and coefficient of thermal expansion (CTE) of irradiated polycrystalline quartz are interpreted through analytical homogenization of experimental data on irradiated α-quartz published by Mayer and Lecomte (1960). The proposed model, implemented in the meso-scale simulation code AMIE, is compared to experimental data obtained on ordinary concrete made of quartz/quartzite aggregate (Dubrovskii et al. 1967). Substantial discrepancy, in terms of damage and volumetric expansion developments, is found when comparing irradiation scenarios assuming constant flux and temperature, as opposed to more realistic test reactor operation conditions.

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“…Le chauffage induit différentes modifications de ses propriétés et, en particulier, des changements de microstructure accompagnés de perte de résistance mécanique et de masse ( [1], [2]). L'influence mécanique de différents types de fibres après exposition à des températures élevées a été précédemment étudiée ( [3]).…”

Section: Introductionunclassified

Evolution de la résistance au poinçonnement d’un matériau cimentaire soumis à la flamme

Ezziane

Kadri

Jauberthie

et al. 2012

MATEC Web of Conferences

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Abstract. The mechanical properties of the cement-based materials, when subjected to high temperatures, are reduced. The surface cracking causes a drop in flexural strength very sensitive to the surface state. The mortars tested are mortars reinforced with fibres of various types: control sample without fibres, steel fibre mortar, polypropylene fibre mortar and steel / polypropylene fibre mortar. After testing these materials in the oven by varying the temperature parameter, we were interested to the behaviour of the test specimens in the presence of a propane flame. The fibre-reinforced mortar is subjected to the flame on one face; the evolution of the temperature gradient is followed in time. The influence of fibre type is quantified. The cracks appear both on the side exposed to the flame but also, and to a lesser extent on the cold face. After a certain exposure time, the mechanical properties are compared. A mechanical test was developed to determine the influence of cracking on the punching strength. The role of fibres, by their nature and by their position relative to the hot face is analysed. When the plates tested are designed with a low water to cement ratio, the phenomenon of spailling appears. The intensity of this phenomenon varies with the nature of the fibering.Résumé. Les matériaux à base cimentaire, lorsqu'ils sont soumis à des températures élevées, voient leurs caractéristiques mécaniques diminuer. La fissuration de surface entraîne notamment une chute de la résistance en flexion très sensible à l'état de surface. Les mortiers testés sont des mortiers fibrés avec des fibres de différentes natures: échantillon témoin non fibré, mortier fibré acier, mortier fibré polypropylène, mortier fibré acier/polypropylène. Après avoir testé ces matériaux au four en faisant varier le paramètre température, nous nous sommes intéressés au comportement en présence d'une flamme propane. Le mortier fibré est soumis à la flamme sur une face, l'évolution du gradient thermique est suivie dans le temps. L'influence du type de fibres est quantifiée. Les fissurations apparaissent aussi bien sur la face exposée à la flamme mais aussi, et de façon moindre sur la face froide. Après un certain temps d'exposition, les caractéristiques mécaniques sont comparées. Un test mécanique est mis au point afin de déterminer l'influence de la fissuration sur la résistance au poinçonnement. Le rôle des Web of Conferences

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Experimental study of micro/macro crack development and stress–strain relations of cement-based composite materials at elevated temperatures

Cited by 146 publications

References 6 publications

Tensile and shear bond strength between cement paste and aggregate subjected to high temperature

Tensile and shear bond strength between cement paste and aggregate subjected to high temperature

Combined Effects of Temperature and Irradiation on Concrete Damage

Evolution de la résistance au poinçonnement d’un matériau cimentaire soumis à la flamme

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