Jan 07, 2016· Gypsum concrete has been installed and specified since the late 1970s. Aggregates The introduction of an aggregate such as sand to the hemihydrate slurry will reduce the strength of the hardened mass because it spreads the new hydrated gypsum crystals apart. Sand also prevents the new hydrated gypsum crystals from growing into each other.
Dispelling common myths associated with poured gypsum ...
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