Creep Of Portland Cement Paste: Final Report

Mullen, W G

doi:10.5703/1288284314443

“…This is contradictory to some research that suggests there is no creep behavior in the cement paste if the evaporable water is removed [11][12][13].…”

Section: Hydrated Portland Cementcontrasting

confidence: 47%

Viscoelastic nature of calcium silicate hydrate

Alizadeh

¹

,

Beaudoin

²

,

Raki

³

2010

Cement and Concrete Composites

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.cemconcomp.2010.02.008 Cement and Concrete Composites, 32, 5, pp. 369-375, 2010-05-01 Viscoelastic nature of calcium silicate hydrate Alizadeh, R.; Beaudoin, J. J.; Raki, L.http://www.nrc-cnrc.gc.ca/irc V isc oe la st ic na t ure of c a lc ium silic a t e hydra t e NRCC-52713Alizadeh, R.; Beaudoin, J.J.; Raki, L. AbstractThe origin of the time-dependent response of cement-based materials to applied stress has not been clearly resolved. The role of interlayer water in the mechanical behavior of calcium silicate hydrate (C-S-H) is still debated. In order to better understand the pertinent mechanisms, the stress relaxation tests were conducted on thin rectangular beams of compacted synthetic C-S-H powder and hydrated Portland cement subjected to three-point bending. C-S-H specimens of variable composition (C/S=0.8, 1.2 and 1.5) were prepared at various moisture content levels from saturation to the dry state. A special drying procedure was applied in order to remove the adsorbed and interlayer water incrementally from C-S-H conditioned at 11%RH. It was shown that a significant part of the relaxation at saturation is attributed to the hydrodynamic component associated with the pore water. It was demonstrated that the viscoelastic performance of C-S-H depends considerably on the presence of interlayer water. It is argued that the results support the validity of the theory of sliding of C-S-H sheets as a time-dependent deformation mechanism responsible for the creep and stress relaxation of cement-based materials. This concept was illustrated in a proposed model for the viscoelastic response of C-S-H.

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“…The results suggest that probably <jl -h or h 1(1 + h). This expression agrees with the fact that the creep of dried specimens is negligible [28,31], and that creep is the greater, the higher is h if h is kept time-constant during creep [30], [31], [1], [2], [29].…”

Section: Z P Bazantsupporting

confidence: 71%

“…Since K is known to decrease only slightly with drying [28,12], Kd must be rather high with respect to Kc (see eq. 60).…”

Section: Z P Bazantmentioning

confidence: 99%

“…The effect of humidity upon creep and shrinkage, along with the fact that completely dried specimens do not exhibit any significant creep [28][29][30][31] at low stress levels, suggests that the main source of this phenomenon is the evaporable water. This hypothesis is justified by the present knowledge about the structure of cement paste [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Constitutive equation for concrete creep and shrinkage based on thermodynamics of multiphase systems

Bažant

¹

1970

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RESUME L'action des variations d'humidite et de temperature sur Ie beton, compte tenu des facteurs de dimension et de forme, ainsi que de la repartition des contraintes est traduite par I'equation fondamentale du f1uage, du retrait et de la dilatation thermique. La pate de ciment et Ie beton sont etudies en tant que materiaux composites multiphases dans lesquels les conditions d'equilibre, tant statique que thermodynamique, doivent etre considerees. (28), (25), (40), (38) = 10-7 , mm, it = (u)· = ou lot, sign, ~ " approximately equal ", -7 +-" assign " SUMMARY

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“…There remains however, a dichotomy of opinion concerning the role of water in the creep process. Water movement is considered either an essential element or a secondary factor [4,5]. Descriptions of creep mechanisms often correspond to conceptions or models of the calcium silicate hydrate microstructure [6].…”

Section: Introductionmentioning

confidence: 99%

A coupled A.C. impedance-creep and shrinkage investigation of hardened cement paste

Tamtsia¹

2003

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Structures, 36, pp. 147-155, 2003-04-01 A Coupled A.C. impedance -creep and shrinkage investigation of hardened cement paste Tamtsia, B. T.; Beaudoin, J. J.; Marchand, J. Materials and ABSTRACTThe effect of three pre-drying treatments (prior to re-saturation with synthetic pore fluid) on time dependent deformation was investigated.The pre-drying treaments comprised methanol and isopropanol exchange (followed by vacuum heating at 37°C) and vacuum drying at 37°C alone. Real-time changes in microstructure due to sustained load were followed through the coupling of an a.c. impedance frequency analyzer with a miniature loading system. Cement paste specimens were in the form of Tshaped columns with minimum thickness value around 1 mm. The impedance analysis included an assessment of the relevance of the high frequency arc depression angle to creep and shrinkage behavior of cement paste. RÉSUMÉ

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Creep Of Portland Cement Paste: Final Report

Cited by 9 publications

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Viscoelastic nature of calcium silicate hydrate

Viscoelastic nature of calcium silicate hydrate

Constitutive equation for concrete creep and shrinkage based on thermodynamics of multiphase systems

A coupled A.C. impedance-creep and shrinkage investigation of hardened cement paste

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