Optimization of Anti-creep Admixtures for Plasterboards

Jean Colombani (1) , M. Bellotto

1 ILM - Institut Lumière Matière [Villeurbanne]

We have measured by digital holographic interferometry the dissolution rate constant of gypsum in water containing various phosphonates, both small molecules and polymers, known to adsorb at the gypsum crystal surface. We have beside measured by rheometry the shear creep rate of gypsum plaster containing these phosphonates in saturated humid environment. The phosphonates decrease both the dissolution velocity and humid creep velocity, consolidating the assumption of reaction-driven pressure solution creep for the humid creep of gypsum plaster. All these phosphonates are efficient anti-creep admixtures of humid set plaster, the polymeric ones having the complementary advantage to be easier to use, with a less delicate dosage.

Domaines: Matériaux; Construction durable

Jean Colombani, M. Bellotto. Optimization of Anti-creep Admixtures for Plasterboards. Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9), Sep 2013, Cambridge, MA, United States. pp.380-387, ⟨10.1061/9780784413111.045⟩. ⟨hal-03789740⟩