Abstract
In an effort to determine how and when water re-enters interlayer spaces the helium flow technique is applied to the dried hydrated portland cement system during re-exposure to water vapour. Two sets of samples at four water-cement ratios were exposed consecutively, to 11, 32, 42, 66, 84 and 100 per cent RH. After each exposure they were reconditioned to 11 per cent RH before measurements were made. Measurements were also taken following second drying. Results show that water re-enters the interlayer structure after exposure to the lowest humidity. Measurements following second drying show that rewetting regenerates the process that occurred on first drying.
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