The experimental results are presented in two groups: the degree of hydration and the DSC data. The degree of hydration data are discussed first because their interpretation, and relationship to concrete field performance, are straightforward. The DSC data, though more complex, are only analyzed qualitatively to gain additional insight into the DOH results, and to study microstructural development.
Herein, the samples are referred to by their water-cement ratios (w/c) and their duration of initial exposure to the 100 % RH environment. For example, the 3 d samples are those that were exposed to the 100 % RH environment for 3 d prior to 90 % RH exposure. Continuous exposure to 100 % RH is referred to as a saturated water vapor exposure (SWVE). Conversely, exposure to 90 % RH is referred to as an unsaturated water vapor exposure (UWVE).