Experimental Investigation of Coupled Hydro-mechanical Behavior of Geomaterials Interfaces

Abstract

Construction joints are a common concern in reinforced concrete structures, often posing as potential weak points that can compromise structural integrity. This study delves into the use of geopolymer, a sustainable and green material, as a promising repair material for reinforced concrete. Specifically, this research focuses on the potential of metakaolin-based geopolymers. The fundamental mechanical properties and feasibility of geopolymer mortar were investigated through uniaxial compression tests. Additionally, experiments designed following Darcy's Law were conducted to comprehend the permeability characteristics. These experiments revealed a significant water saturation influence on permeability, which decreases with increasing air pressure and confining pressure. Then, the porosity of this geopolymer mortar is 26.87% using gas while 18.54% using water. Further, a series of shear bond tests were performed to explore the hydro-mechanical behavior at the interface between geopolymer mortar and ordinary concrete under loading conditions. The results indicate commendable bonding performance at the interface, exhibiting a bond strength of 5.49MPa， signifying the potential for further research in this domain.