Documents disponibles écrits par cet auteur

Correlation of hollow and solid cylinder dynamic pressurization tests for measuring permeability / Christopher A. Jones in Cement and concrete research, Vol. 39 N° 4 (Avril 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 4 (Avril 2009) . - pp. 345–352 Titre : Correlation of hollow and solid cylinder dynamic pressurization tests for measuring permeability Type de document : texte imprimé Auteurs : Christopher A. Jones, Auteur ; Zachary C. Grasley, Auteur Année de publication : 2009 Article en page(s) : pp. 345–352 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Degradation;  Durability;  Permeability;  Transport  properties;Poromechanics Résumé : An experimental apparatus and analytical derivation are developed for quantifying the permeability of cementitious materials using dynamic pressurization of a hollow cylinder. Experimental results from the newly developed hollow dynamic pressurization technique for measuring permeability are then compared to results obtained using the solid dynamic pressurization test. The measured permeabilities obtained from testing Vycor® glass and hardened cement paste indicate close agreement between the two test methods, which supports the validation of the hollow dynamic pressurization test as an accurate and repeatable method for measuring the permeability of cementitious materials. Three different pore fluids with widely varying viscosities were tested, each yielding equivalent intrinsic permeabilities. Additionally, the permeability values from this study agree reasonably well with relevant values presented in the recent literature. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000040 [article] Correlation of hollow and solid cylinder dynamic pressurization tests for measuring permeability [texte imprimé] / Christopher A. Jones, Auteur ; Zachary C. Grasley, Auteur . - 2009 . - pp. 345–352. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 4 (Avril 2009) . - pp. 345–352 Mots-clés : Degradation;  Durability;  Permeability;  Transport  properties;Poromechanics Résumé : An experimental apparatus and analytical derivation are developed for quantifying the permeability of cementitious materials using dynamic pressurization of a hollow cylinder. Experimental results from the newly developed hollow dynamic pressurization technique for measuring permeability are then compared to results obtained using the solid dynamic pressurization test. The measured permeabilities obtained from testing Vycor® glass and hardened cement paste indicate close agreement between the two test methods, which supports the validation of the hollow dynamic pressurization test as an accurate and repeatable method for measuring the permeability of cementitious materials. Three different pore fluids with widely varying viscosities were tested, each yielding equivalent intrinsic permeabilities. Additionally, the permeability values from this study agree reasonably well with relevant values presented in the recent literature. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000040

Quasi-static axial damping of poroviscoelastic cylinders / Zachary C. Grasley in Journal of engineering mechanics, Vol. 137 N° 8 (Août 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 8 (Août 2011) . - pp.561-570 Titre : Quasi-static axial damping of poroviscoelastic cylinders Type de document : texte imprimé Auteurs : Zachary C. Grasley, Auteur ; Chin Leung, Auteur Année de publication : 2011 Article en page(s) : pp.561-570 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Viscoelasticity  Cyclic  tests  Concrete  Cylinder  Poroelasticity Résumé : Design of infrastructure materials with inherent material damping may help dissipate energy during dynamic loading events such as earthquakes, thereby reducing structural damage and risk of collapse. One possible method to enhance damping of cementitious materials such as concrete is to utilize poromechanical damping. To evaluate the potential damping associated with the poromechanical effect and to aid in the design of high damping porous materials such as concrete, approximate closed-form solutions have been derived for poromechanical damping as a function of frequency, maximum damping, and critical damping frequency for axially loaded solid and hollow cylinders. The effect of inherent viscoelastic damping of the porous material body was included in the analysis, which indicated that inherent viscoelastic damping could be superposed on poromechanical damping to predict overall damping capacity. Simulations indicate that poromechanical damping may be significant for cementitious materials if designed appropriately. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i8/p561_s1?isAuthorized=no [article] Quasi-static axial damping of poroviscoelastic cylinders [texte imprimé] / Zachary C. Grasley, Auteur ; Chin Leung, Auteur . - 2011 . - pp.561-570. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 8 (Août 2011) . - pp.561-570 Mots-clés : Viscoelasticity  Cyclic  tests  Concrete  Cylinder  Poroelasticity Résumé : Design of infrastructure materials with inherent material damping may help dissipate energy during dynamic loading events such as earthquakes, thereby reducing structural damage and risk of collapse. One possible method to enhance damping of cementitious materials such as concrete is to utilize poromechanical damping. To evaluate the potential damping associated with the poromechanical effect and to aid in the design of high damping porous materials such as concrete, approximate closed-form solutions have been derived for poromechanical damping as a function of frequency, maximum damping, and critical damping frequency for axially loaded solid and hollow cylinders. The effect of inherent viscoelastic damping of the porous material body was included in the analysis, which indicated that inherent viscoelastic damping could be superposed on poromechanical damping to predict overall damping capacity. Simulations indicate that poromechanical damping may be significant for cementitious materials if designed appropriately. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i8/p561_s1?isAuthorized=no