GYPSUM

[:ru]Пачон-Родригез Е. А.[:en]Pachon-Rodriguez, E. A.[:] [:ru]Лаборатория физики конденсированных сред и наноструктур, Университет Лиона; Университет Лиона 1 им. Клода Бернара, Национальный центр научных исследований, Франция[:en]Laboratory of Physics of Condense Mediums and Nanostructures, University of Lyon; University Claude Bernard Lyon 1, CNRS National Scientific Research Centre, France[:]

[:ru]Коломбани Ж.[:en]Colombani, J.[:] [:ru]Лаборатория физики конденсированных сред и наноструктур, Университет Лиона; Университет Лиона 1 им. Клода Бернара, Национальный центр научных исследований, Франция[:en]Laboratory of Physics of Condense Mediums and Nanostructures, University of Lyon; University Claude Bernard Lyon 1, CNRS National Scientific Research Centre, France[:]

Alitinform №1 (23) 2012 г. 106-112 p.

Abstract

Although the negative influence of water on set plaster properties is well known, the mechanism responsible for the enhancement of plasterboard creep in humid environment is still unknown. Having used holographic interferometry and three-point bending creep tests, we present here experimental evidence of the connection between the mechanical behaviour of wet set plaster containing anti-creep additives and the kinetics of gypsum dissolution in water containing these additives. The use of a first-order model of pressure solution creep, which is widely applied in geology, allows us to propose pressure solution creep as one of the main mechanisms responsible for the wet creep of set plaster.

Key words:

gypsum; creep of plasterboard; hologra­phic interferometry; anti-creep additives