At earlier ages, lower-density aerated slurries exhibit a minor rise in UPV for more than 10 h while the higher-density slurry exhibits a clear trend towards UPV increase as soon as 1 h after mixing.
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Physio-Microstructural Properties of Aerated Cement Slurry for Lightweight Structures.
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The sentences
This is a positive trend, indicating that lowering the density of the slurry via aeration would actually improve its barrier qualities for protecting the building interior as well as the natural insulation against weathering effects.