Triaxial mechanical behaviour of mortar: Effects of drying

Yurtdas, Ismail; Burlion, Nicolas; Skoczylas, Frédéric

doi:10.1016/j.cemconres.2003.12.004

Cited by 79 publications

(25 citation statements)

References 14 publications

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“…Experimental evidences and theoretical models for coupled damage-drying problems exist in the literature (see e.g. Yurtdas et al, 2004). We consider, however, that damage during the service life (drying time) of the vessel is moderate.…”

Section: General Methodology-chained Calculation Processmentioning

confidence: 99%

Hydraulic behaviour of a representative structural volume for containment buildings

Jason

Pijaudier‐Cabot

Ghavamian

et al. 2007

Nuclear Engineering and Design

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For particular structures like containment buildings of nuclear power plants, the study of the hydraulic behaviour is of great concern. These structures are indeed the third barrier used to protect the environment in case of accidents. The evolution of the leaking rate through the porous medium is closely related to the changes in the permeability during the ageing process of the structure. It is thus essential to know the relation between concrete degradation and the transfer property when the consequences of a mechanical loading on the hydraulic behaviour have to be evaluated. A chained approach is designed for this purpose. The mechanical behaviour is described by an elastic plastic damage formulation, where damage is responsible for the softening evolution while plasticity accounts for the development of irreversible strains. The drying process is evaluated according to a non-linear equation of diffusion. From the knowledge of the damage and the degree of saturation, a relation is proposed to calculate the permeability of concrete. Finally, the non-homogeneous distribution of the hydraulic conductivity is included in the hydraulic problem which is in fact the association of the mass balance equation for gas phase and Darcy law. From this methodology, it is shown how an indicator for the hydraulic flows can be deduced.

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Section: General Methodology-chained Calculation Processmentioning

confidence: 99%

Hydraulic behaviour of a representative structural volume for containment buildings

Jason

Pijaudier‐Cabot

Ghavamian

et al. 2007

Nuclear Engineering and Design

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“…This type of mortar has been widely used in our laboratory for the study of other properties of cement-based materials, such as the role of thermal treatments on its mechanical properties [3,4], poro-mechanical properties [5] and transport properties under different confining pressures [6,7]. In addition, this type of mortar can be easily reproduced by other laboratories.…”

Section: Experimental Materials and Methodsmentioning

confidence: 96%

Characterization of a rehydration phenomenon on cement-based materials containing heat-induced cracks: coupled transport properties and X-ray micro-tomography

Pei¹,

Skoczylas²,

Hauss³

2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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This study deals with the phenomenon of rehydration in heat-induced macro/micro cracks for a normalized mortar and concrete paste, both having a W/C ratio of 50%. Reyhydration was tested using steady state gas (argon) and ethanol permeability measurements provided by our laboratory, combined with thermo-gravimetric (ATG) and micro-tomographic (CT) analyses. Prior to these experiments, all of the samples were subjected to successive heating-cooling cycles, from a 105°C reference state, up to 600°C. At the macroscopic level, the material's transport properties are determined by means of gas permeability tests, following which the same sample is measured using the ethanol permeability test (after saturation in distilled water and drying at 105°C). At the microscopic level, the pore network of the heat-treated cement pastes is characterized using CT (voxel≈4μm), before and after rehydration in order to assess its 3D profile. This includes quantitative analysis of the crack size, the connected and non-connected pore volume, the pore surface area, as well as the pores' distribution. The self-healing capacity of saturated heat-treated cement-based materials is clearly revealed, when these results are combined with ATG analyses of the material's mineralogical composition.The results show that following heat-treatment, the gas permeability of mortars is of the order of 10 -15 m 2 at 600°C, whereas following rehydration, their ethanol permeability lies in the range between 10 -18 and 10 -17 m 2 , which is quite close to the intact gas permeability of mortar at 105°C.

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“…Numerous and important results were obtained and mainly concern uniaxial and triaxial compressive tests carried out on samples A, B and C, with various desiccation times for samples B [11,18,19]. The main results obtained on Young's modulus and Poisson's ratio variations as well as on uniaxial and triaxial strengths are reported in Table 1.…”

Section: Review Of Previous Studies On the Drying Effects Upon Uniaximentioning

confidence: 95%

“…Most often, and whatever the loading type (uniaxial or triaxial), elastic properties variations are observed after drying: decrease in elastic modulus of concrete [9,16,17] and mortar [8,10,11,18,24]. The decrease is also observed with Poisson's ratio [10,11,18].…”

Section: Introductionmentioning

confidence: 96%

“…Moreover there are observable consequences induced by drying which are less often described in the literature. On the one hand, the rise of capillary suction brings about increase in uniaxial compressive strength of mortars [8][9][10][11], concretes [12][13][14][15] and in triaxial compressive strength of mortars [10,18,19]. Increase in capillary suction leads to a compression of the solid skeleton which is similar to a ''pre-stressing'' of mortar acting like confining pressure.…”

Section: Introductionmentioning

confidence: 99%

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