Imbibition in kaolinite plaster under finite water amounts

Abstract

This study addresses the imbibition kinetics of finite water amounts in kaolinite plasters. Using an X-ray tomograph with in-situ liquid addition, 2D radiograph images precisely measure the water imbibition and distribution. Two distinct regimes are observed in the presence of a limited water reservoir. Following a classical penetration scaling with the square root of time, the progression continues slowly. The addition of sand minimally impacts these kinetics, only modifying the porosity volume. Imbibition front kinetics is described by analyzing unsaturated flow under limited water conditions, particularly in scenarios where water availability is restricted. The study underscores the importance of investigating imbibition under finite water amounts, a common degradation scenario. The physical understanding aims to contribute to the enhanced design of earthen plaster.