Time-dependent behaviour of hardened cement paste under isotropic loading

Vu, Minh‐Ngoc; Sulem, Jean; Ghabezloo, Siavash; Laudet, Jean-Benoît; Garnier, André; Guédon, Stéphanie

doi:10.1016/j.cemconres.2012.03.002

Cited by 18 publications

(7 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The residual strain of –0.00088 (0.088%) was recorded at the end of stage Ⅱ after the compressive load was removed. This residual strain indicated that the C 3 S‐FA specimen underwent plastic deformation owing to the collapse of the micropores leading to the compaction of the specimen 60 and also implied the viscous strain due to the intrinsic viscoelastic properties of the cementitious paste 61,62 . The strain during stage III was –0.00252 (0.252%), which resulted in larger deformations than those that occurred during stage I; moreover, the repeated compression loading contributed to the increase in the plastic deformation of the C 3 S‐FA specimen.…”

Section: Resultsmentioning

confidence: 96%

Determination of atomistic deformation of tricalcium silicate paste with high‐volume fly ash

Jee

Kanematsu

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

Supplementary cementitious materials (SCMs), such as blast-furnace slag, 1 fly ash (FA), 2 natural pozzolans, 3 calcined clays, 4 and silica fumes, 5 have been investigated as partial replacements for Portland cement (PC) in concrete mixes. FA, a by-product of coal, is one of the main SCMs, and has been studied extensively. 6 Using FA as a partial replacement for PC allows for recycling of the industrial by-products, effectively reduces carbon emissions from cement production, and confers durability to concrete. 7 According to ASTM C618, there are two types of FA, namely Class F and Class C, which are defined based on their contents of silicates and CaO. While Class F is the main type of FA currently produced, it does not possess cementitious characteristics. 8 However, the siliceous and

show abstract

Section: Resultsmentioning

confidence: 96%

Determination of atomistic deformation of tricalcium silicate paste with high‐volume fly ash

Jee

Kanematsu

et al. 2020

J Am Ceram Soc

View full text Add to dashboard Cite

show abstract

“…This value approaches those for Berea sandstone at low pore pressure to total stress ratios. Vu et al () reported a cement paste (similar in poroelastic properties to calcarenite) as having a bulk viscosity of approximately 2.5 × 10 14 Pa s, and its decrease by a factor of 2 with an increase in temperature from 20 to 90 °C.…”

Section: Discussionmentioning

confidence: 99%

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Makhnenko

Podladchikov

2018

JGR Solid Earth

View full text Add to dashboard Cite

The success of geoenergy applications such as petroleum recovery or geological storage of CO2 depends on properly addressing the physical coupling between the pore fluid diffusion and mechanical deformation of the subsurface rock. Constitutive models should include short‐term hydromechanical interactions and long‐term behavior and should incorporate the principles behind the mathematical models for poroelastic and poroviscoelastic responses. However, the viscous parameters in constitutive relationships still need to be validated and estimated. In this work, we experimentally quantify the time‐dependent response of fluid‐filled sedimentary rocks at room temperature and isotropic stress states. Drained, undrained, and unjacketed geomechanical tests are performed to measure the poroelastic parameters for Berea sandstone, Apulian limestone, clay‐rich material, and Opalinus clay (shale). A poroviscous model parameter, the bulk viscosity, is included in the constitutive relationships. The bulk viscosity is estimated under constant isotropic stress conditions from time‐dependent deformation of rock in the drained regime for timescales ~105 s and from observations of the pore pressure growth under undrained conditions at timescales of ~104 s. The bulk viscosity is on the order of 1015–1016 Pa s for sandstone, limestone, and shale and ~1013 Pa s for clay‐rich material, and it decreases with an increase in pore pressure despite a corresponding decrease in the effective stress. In the long term, fluid pressure can asymptotically approach minimum principal stress, which in natural reservoirs may lead to liquefaction or rock embrittlement, causing slip instabilities and earthquakes and creating high‐permeability channels in low‐permeable rock.

show abstract

“…For sake of simplicity, it was however preferred in a first attempt to adopt a basic viscoelastic Kelvin-Voigt rheological model made up of an elastic spring with bulk modulus K connected in parallel with a viscous damper of viscosity ! , following the approaches adopted by Ghabezloo et al (2008), and Vu et al (2012) on hardened cement pastes.…”

Section: 2! Effects Of Volumetric Creep On Thermal Strainsmentioning

confidence: 99%

Thermal Volume Changes and Creep in the Callovo-Oxfordian Claystone

et al. 2017

Self Cite

View full text Add to dashboard Cite

International audienceThe Callovo-Oxfordian (COx) claystone is considered as a potential host rock for high-level radioactive waste disposal at great depth in France. Given the exothermic nature of radioactive wastes, a temperature elevation planned to be smaller than 100 °C will affect the host rock around the disposal cells. To gain better understanding of the thermal volumetric response of the COx claystone, a new thermal isotropic compression cell was developed with particular attention devoted to monitoring axial and radial strains. To do so, a high-precision LVDTs system ensuring direct contact between the LVDT stem and the claystone sample through the membrane was developed. A short drainage length (10 mm) was also ensured so as to allow full saturation of the sample under stress conditions close to in situ, and fully drained conditions during compression. High-precision strain monitoring allowed to observe a volumetric creep under stress conditions close to in situ. A drained heating test under constant stress carried out afterwards up to 80 °C exhibited a thermoelastic expansion up to a temperature of 48 °C, followed by thermoplastic contraction at higher temperature. Creep volume changes, that appeared to be enhanced by temperature, were modelled by using a simple Kelvin–Voigt model, so as to estimate the instantaneous response of the COx claystone and to determine its thermal expansion coefﬁcient. The temperature at which the transition between thermal expansion and contraction appeared is close to the maximum burial temperature of the Callovo-Oxfordian claystone, estimated at 50 C. This is in agreement with what has been already observed on the Opalinus Clay by Monfared et al. (2012) that was interpreted as a thermal hardening phenomenon, showing that the material kept the memory of the highest temperature supported during its geological history

show abstract

Time-dependent behaviour of hardened cement paste under isotropic loading

Cited by 18 publications

References 29 publications

Determination of atomistic deformation of tricalcium silicate paste with high‐volume fly ash

Determination of atomistic deformation of tricalcium silicate paste with high‐volume fly ash

Experimental Poroviscoelasticity of Common Sedimentary Rocks

Thermal Volume Changes and Creep in the Callovo-Oxfordian Claystone

Contact Info

Product

Resources

About