000125882 001__ 125882
000125882 005__ 20181205220239.0
000125882 0247_ $$2doi$$a10.5075/epfl-thesis-4177
000125882 02470 $$2urn$$aurn:nbn:ch:bel-epfl-thesis4177-7
000125882 02471 $$2nebis$$a5641501
000125882 037__ $$aTHESIS
000125882 041__ $$afre
000125882 088__ $$a4177
000125882 245__ $$aÉtude numérique et expérimentale du retrait endogène de la pâte de ciment au jeune âge
000125882 269__ $$a2008
000125882 260__ $$aLausanne$$bEPFL$$c2008
000125882 300__ $$a209
000125882 336__ $$aTheses
000125882 520__ $$aAutogenous shrinkage is a complex phenomenon in which many physical and mechanical mechanisms are involved. The latter may also interact between each other and many of these coupling mechanisms are still not well understood. Understanding of these mechanisms and their quantification can provide tools for preventing early age cracking and its treatment. The aim of this thesis was to quantify in the first step the influence of the cement characteristics and the microstructural development on mechanisms occurring on a microscopic level leading to shrinkage and internal stress development. In the second step, a numerical model for determination of autogenous shrinkage was developed. A systematic experimental study has been performed, from the end of mixing up to 10 days, on series of cement pastes prepared from the same white cement with different finenesses and various water-to-cement ratios (W/C). Different characteristics were measured by a number of techniques in the experimental study: chemical shrinkage, hydration kinetics (isothermal calorimetry, XRD, SEM), relative humidity, capillary porosity (SEM, MIP), linear and volumetric autogenous shrinkage, elastic properties (ultrasonic propagation measurements). Using different techniques allowed to validate characteristics by more than one technique and to determine the action mechanism of each parameter. In order to provide an independent prediction, except for the intrinsic mechanical or physical properties of the existing phases which may determined by nano-indentation, the numerical model does not depend on any other experimental data from this study. The experimental and numerical results are compared and the differences are analysed.
000125882 6531_ $$aautogenous shrinkage
000125882 6531_ $$acement paste
000125882 6531_ $$aexperimental study
000125882 6531_ $$anumerical model
000125882 6531_ $$aretrait endogène
000125882 6531_ $$apâte de ciment
000125882 6531_ $$aétude expérimentale
000125882 6531_ $$amodèle numérique
000125882 700__ $$aJaouadi, Ines
000125882 720_2 $$0244030$$aScrivener, Karen$$edir.$$g138857
000125882 720_2 $$0244345$$aGuidoum, Amor$$edir.$$g107372
000125882 8564_ $$s48828625$$uhttps://infoscience.epfl.ch/record/125882/files/EPFL_TH4177.pdf$$yTexte intégral / Full text$$zTexte intégral / Full text
000125882 909C0 $$0252300$$pLMC$$xU10341
000125882 909CO $$ooai:infoscience.tind.io:125882$$pthesis-bn2018$$pDOI$$pSTI$$pthesis$$qDOI2
000125882 918__ $$aSTI$$cIMX$$dEDMX
000125882 919__ $$aLMC
000125882 920__ $$b2008
000125882 970__ $$a4177/THESES
000125882 973__ $$aEPFL$$sPUBLISHED
000125882 980__ $$aTHESIS