Abstract
Water losses and gains, nitrogen adsorption, and imbibition of organic fluids were measured in a study of the pore structure of two, well-hydrated alite pastes that had original water/alite ratios of 0.4 and 0.6 by weight. Drying from saturation to a relative humidity in the range 0.3 to 0.8 was a particularly slow process probably because some pores emptied via smaller pores. The nitrogen adsorption measurements, on pastes in which the water has been removed by organic fluid replacement, suggested that micropores were closing as a result of capillary tensions developed at relative humidities between 0.7 and 0.4. The loss of surface area was recoverable with resaturation of the pastes with water. Imbibition of water and organic fluids indicated that there was an irrecoverable pore volume loss after drying and rewetting that was dependent upon the relative humidity of drying.
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