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Numerical modelling of autogeneous shrinkage of hardening cement paste
Hardened cement paste is a porous material. As hydration proceeds, pores become emptied and the relative humidity reduces. This reduction of the relative humidity goes along with a reduction of the pressure in the emptied pore space. Thermodynamic equilibrium requires an increase of the surface tension in the boundary layer that develops at the inner pore wall area. Describing the volumetric changes of hardening cement paste on thermodynamical basis turned out to be quite satisfactory. The proposed model predicts the autogenous deformation of hardening cement paste quite accurately. The numerical simulations are in good agreement with the experimentally obtained results for cement pastes that contain cement of relatively high fineness as well as for pastes that contain a relatively coarse type of cement. This holds true for various water/cement ratios. In addition, to come to a model to predict the volumetric changes of hardening concrete, internal restraint due to the availability of stiff aggregates has to be taken into account. Composite models as proposed by Counto or Hirsch can be applied for this purpose. The internal restraint can also be simulated with the aid of a lattice model.
Numerical modelling of autogeneous shrinkage of hardening cement paste
Hardened cement paste is a porous material. As hydration proceeds, pores become emptied and the relative humidity reduces. This reduction of the relative humidity goes along with a reduction of the pressure in the emptied pore space. Thermodynamic equilibrium requires an increase of the surface tension in the boundary layer that develops at the inner pore wall area. Describing the volumetric changes of hardening cement paste on thermodynamical basis turned out to be quite satisfactory. The proposed model predicts the autogenous deformation of hardening cement paste quite accurately. The numerical simulations are in good agreement with the experimentally obtained results for cement pastes that contain cement of relatively high fineness as well as for pastes that contain a relatively coarse type of cement. This holds true for various water/cement ratios. In addition, to come to a model to predict the volumetric changes of hardening concrete, internal restraint due to the availability of stiff aggregates has to be taken into account. Composite models as proposed by Counto or Hirsch can be applied for this purpose. The internal restraint can also be simulated with the aid of a lattice model.
Numerical modelling of autogeneous shrinkage of hardening cement paste
Numerische Modellierung der Eigenschwindung von erhärtenden Zementpasten
Koenders, E.A.B. (author) / Breugel, K. van (author)
1997
11 Seiten, 7 Bilder, 1 Tabelle, 19 Quellen
Conference paper
English
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Numerical Modelling of Autogenous Shrinkage of Hardening Cement Paste
| Online Contents | 1997