Abstract
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. For validation of the model, experiments have been carried out. Good agreement is reached between the numerical simulations and the results obtained from experiments.
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