What are the main features of gypsum for civil engineering materials?
Gypsum slurry in the initial hardening will produce micro-expansion. The nature of this gypsum product surface is smooth, delicate, accurate size, full shape, good decorative.
Building gypsum in the water after mixing, the slurry in a few minutes began to lose plasticity, complete loss of plasticity within 30min and produce strength, about a week or so completely hardened. To meet the construction requirements, need to join the retarder, such as borax, potassium tartrate, citric acid, polyvinyl alcohol, lime activated bone glue or leather and so on.
Has a certain humidity, fire resistance, water resistance, poor frost resistance
Coagulation hardening fast, condensation hardening when the volume of micro-expansion, porosity.
