Experimental evidence of a moisture clog effect in cement-based materials under temperature

Xiaoting, Chen; Rougelot, Thomas; Davy, Catherine; Chen, Wei; Agostini, Franck; Skoczylas, Frédéric; Bourbon, Xavier

doi:10.1016/j.cemconres.2009.07.015

Cited by 46 publications

(21 citation statements)

References 29 publications

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“…Physical phenomena justifying solid skeleton failure are both micro-cracking and C-S-H gel dehydration, which are enhanced by heat-treatment. C-S-H dehydration has been evidenced on normalized mortar through thermogravimetry experiments, see [24]. Uniaxial and triaxial deviatoric failure strength data R c are given in Table II with increasing heat-treatment temperature T max .…”

Section: Results and Analysismentioning

confidence: 99%

“…For all triaxial tests, gas permeability measurements under confinement are performed all along the deviatoric stress path. Injected Argon gas pressure P i ranges from 1.27 to 1.38 MPa, and the pressure decrease P used for permeability assessment is of 0.01-0.06 MPa, see for instance [24,29] for details on the experimental methodology for gas permeability assessment.…”

Section: Methodsmentioning

confidence: 99%

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Experimental study and constitutive modelling of elasto‐plastic damage in heat‐treated mortar

Xiaoting

Shao

Davy

et al. 2009

Num Anal Meth Geomechanics

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SUMMARYThis study investigates the effect of a heat-treatment upon the thermo-mechanical behaviour of a model cement-based material, i.e. a normalized mortar, with a (w/c) ratio of 0.5. First, a whole set of varied experimental results is provided, in order to either identify or validate a thermo-mechanical constitutive model, presented in the second paper part. Experimental responses of both hydraulic and mechanical behaviour are given after different heating/cooling cycling levels (105, 200, 300, 400 • C). The reference state, used for comparison purposes, is taken after mass stabilization at 60 • C. Typical uniaxial compression tests are provided, and original triaxial deviatoric compressive test responses are also given. Hydraulic behaviour is identified simultaneously to triaxial deviatoric compressive loading through gas permeability K gas assessment. K gas is well correlated with volumetric strain evolution: gas permeability increases hugely when v testifies of a dilatant material behaviour, instead of contractile from the test start. Finally, the thermo-mechanical model, based on a thermodynamics approach, is identified using the experimental results on uniaxial and triaxial deviatoric compression. It is also positively validated at residual state for triaxial deviatoric compression, but also by using a different stress path in lateral extension, which is at the origin of noticeable plasticity.

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Section: Results and Analysismentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Experimental study and constitutive modelling of elasto‐plastic damage in heat‐treated mortar

Xiaoting

Shao

Davy

et al. 2009

Num Anal Meth Geomechanics

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“…The dry state is obtained by an oven-drying at 60°C and 105°C successively until the sample masses remain constant. A drying at 60°C allows the drainage of porosity down to C-S-H pores [35], while at 105°C it may lead to a complete drainage along with micro-cracking and potential modification of pore network [35,36]. The water saturation degree at a given RH-value is determined as:…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of the first desorption isotherm of a high performance concrete with thin sliced samples

Rougelot

Burlion

et al. 2014

Construction and Building Materials

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“…There are three mechanisms of explosive spalling: pore pressure mechanism [31,32], thermal stress mechanism [33] and combined pore pressure and thermal stress mechanism [34,35]. Further study [36] indicated that the pore pressure mechanism seems to be more dominant.…”

Section: Fire Technology 2016mentioning

confidence: 99%

Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

Xiao

Xie

et al. 2016

Fire Technol

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In this study, both fire tests and low-frequency cyclic loading tests after fire were conducted on three conventional high strength concrete (HSC) shear walls and a superimposed HSC shear wall with precast recycled aggregate concrete (RAC) panels. The RAC in this paper was made with recycled concrete aggregate. When specimens suffered the fire exposure on one side for 45 min, 90 min, and 135 min separately, spalling of concrete, temperature distribution and deformation of specimens were investigated as indicators of fire response. When specimens were subjected to cyclic load after fire, hysteresis curves were obtained, based on which the secant stiffness degradation and energy dissipation capacity of walls were analyzed. The results indicated that HSC would suffer severe spalling during the fire and that fire response of the superimposed wall including spalling was smaller than that of conventional walls. Using RAC panel as a thermal barrier was found to be effective to alleviate spalling, as it reduced more than 60% of spalling of HSC compared with bare walls. Based on the seismic tests results, the fire exposure deteriorated the load bearing capacity, lateral stiffness and energy dissipation capacity of walls, whereas the application of RAC panels improved the load bearing capacity by about 10% even when the superimposed wall was exposed to the fire for a long time.

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Experimental evidence of a moisture clog effect in cement-based materials under temperature

Cited by 46 publications

References 29 publications

Experimental study and constitutive modelling of elasto‐plastic damage in heat‐treated mortar

Experimental study and constitutive modelling of elasto‐plastic damage in heat‐treated mortar

Experimental investigation of the first desorption isotherm of a high performance concrete with thin sliced samples

Fire Resistance and Post-fire Seismic Behavior of High Strength Concrete Shear Walls

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