Viscoelastic nature of calcium silicate hydrate

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Journal titleCement and Concrete Composites
Pages369375; # of pages: 7
SubjectStress relaxation, calcium silicate hydrate (C-S-H), hydrated Portland cement, nanostructure, adsorbed and interlayer water, creep, viscoelastic; Cement/Concrete
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.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number52713
NPARC number20375036
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Record identifier6aa47b68-d94d-48f5-b878-d881cd4dabcd
Record created2012-07-23
Record modified2016-05-09
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