Creep and Shrinkage Law for Concrete at Variable Humidity

Bažant, Zdeněk P.; Wu, Spencer T.

doi:10.1061/jmcea3.0001962

Cited by 35 publications

(15 citation statements)

References 11 publications

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“…How cementitious materials dry is also of interest. There is little doubt there, ever since the pioneering work , showing that the main driving force is capillary tension, possibly relayed in the smallest spaces by disjoining pressure effects (e.g., refs − ). However, the main challenges are the role these processes may play in crystalline natural rocks, as for hydrosystems subjected to drying operations.…”

Section: Introductionmentioning

confidence: 99%

Quartz Stressing and Fracturing by Pore Pressure Dropping Down to Negative Pressure

Mercury

Bilbao

Simon

et al. 2021

ACS Earth Space Chem.

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In water-bearing porous rocks, pore pressure variations play a major role in deformation, through dissolution−precipitation and fracturing processes. An often-overlooked variation where pressure falls to negative pressure or tension can operate whenever aquifer formations dry out, for instance, in deep storage (nuclear or industrial wastes, long-term CO 2 mitigation, short-term energetic resources, etc.). This can generate capillary tension within the aquifers. This study investigates the mechanical effect of such in-pore tension in the surrounding crystal field, through laboratory experiments at the one-pore scale. Microthermometric procedures were carried out on synthetic fluid inclusions to generate large tensile stress and were combined with Raman microspectrometry to visualize the resulting stress fields in the host quartz. For comparison, we numerically modeled the stress field by linear elasticity theory. The experiments demonstrate that significant damage is produced in crystalline materials by the pore tension. Despite the induced stress measured by micro-Raman spectrometry to remain moderate, it is able to fracture the quartz. The volume of the cavity is a prominent controlling parameter for the stress amplitude. The crystalline heterogeneities of the solid are another major parameter for localizing the mean weak stress and accumulating overstress. Our results call for bringing pore-scale micromechanics into the safety assessment of the geological storage of various wastes inside depleted aquifers. They also show the magnifying effect of heterogeneities on propagating stress and localizing it along certain directions, promoting the final failure of water-bearing minerals, rocks, or pore networks. KEYWORDS: tensile strength, pore rock damage, storage safety, Raman scattering, quartz weakening, fluid inclusions 45 of chemical origin, which contributes to water weakening. 5,6 In 46 particular, imaging and quantification of the microstress in the 47 solid network, before and after fluid tension sets up in the 48 pores, have been missing until now. 49 The challenges associated with this area of research are first 50 in materials science in which several examples of tension-51 driven fracture processes still require mechanistic explanations 52 or quantification. While sol−gel processing explains how 53 drying-driven stress causes bodies to crack, how nanoparticle 54 suspensions dry is much less understood, depending 55 appreciably on molecular-scale physics combining capillary 56 and viscous forces (e.g. , refs. 7,8 ). How cementitious materials 57 dry is also of interest. There is little doubt there, ever since the 58 pioneering work 9,10 showing that the main driving force is

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Section: Introductionmentioning

confidence: 99%

Quartz Stressing and Fracturing by Pore Pressure Dropping Down to Negative Pressure

Mercury

Bilbao

Simon

et al. 2021

ACS Earth Space Chem.

View full text Add to dashboard Cite

show abstract

“…Bernard [23] propone en su tesis un modelo de fluencia no lineal 19 válido tanto en compresión como en tracción que posteriormente aplica con excelentes resultados al estudio de vigas formadas por hormigones de características diferentes. Estudiando sus resultados 20 se puede observar como por ejemplo para una tensión de tracción de 0,60f ct el valor de fluencia obtenido por él es 1,2 veces superior al lineal lo cual concuerda muy bien con el sencillo modelo propuesto en este estudio…”

Section: Estudio De Una Fibra De Hormigónunclassified

“…18 Lo cual es relativamente correcto ya que son las que tienen una deformación inicial más acusada además de experimentar proporcionalmente mayores deformaciones en el tiempo y ser por tanto las fibras con una mayor influencia en el proceso. 19 Basado en el acoplamiento de una serie de cadenas de Maxwell. 20 Ver por ejemplo los ábacos que presenta en la página 85 mostrados en la figura 3.12.…”

Section: Estudio De Una Fibra De Hormigónunclassified

“…Para ello basta modificar la ley tensión -deformación del acero pasivo sumando en la misma la componente de rozamiento y manteniendo el softening en el hormigón según se muestra en la figura 4. 19. De manera simplificada, se propone adoptar como ley en tracción del acero pasivo que incorpora el rozamiento en la interfaz una rigidización constante y una transición lineal.…”

Section: Acero Pasivounclassified

“…Por ejemplo, en el programa de ordenador que a continuación se comentará, se ha implementado un módulo de rotura que permite emplear el motor de cálculo para, definidos unos pivotes sobre la sección, obtener el diagrama de interacción momento -axil. Representando este diagrama para una chapa de acero estructural se obtiene un bucle en la zona comprimida 19 . Este resultado, que evidentemente no representa la realidad correctamente, es debido a que la formulación de la RPX -95 presenta algunos problemas en la transición hacia el axil último de compresión ya que considera un diagrama de pivotes estático (con deformaciones constantes en los mismos) 20 .…”

Section: : Leyes De Tensiones Residualesunclassified

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Evaluación no lineal de los efectos estructurales producidos por las deformaciones diferidas del hormigón y el acero

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Etude numérique simplifiée de l'influence de l'effet de fissuration superficielle du béton dans des essais de fluage de dessiccation récents

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Creep and Shrinkage Law for Concrete at Variable Humidity

Cited by 35 publications

References 11 publications

Quartz Stressing and Fracturing by Pore Pressure Dropping Down to Negative Pressure

Quartz Stressing and Fracturing by Pore Pressure Dropping Down to Negative Pressure

Evaluación no lineal de los efectos estructurales producidos por las deformaciones diferidas del hormigón y el acero

Etude numérique simplifiée de l'influence de l'effet de fissuration superficielle du béton dans des essais de fluage de dessiccation récents

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