Permeability of a Macro-Cracked Concrete Effect of Confining Pressure and Modelling

The effects of confining pressure are investigated for two samples of a macro-cracked concrete. Samples are first macro-cracked with a splitting tensile strength test (Brazilian) technique. Gas permeability is continually measured under increasing (or decreasing) confining pressure, whereas crack closure (or opening) is recorded with an LVDT (Linear Variable Differential Transformer) device. Despite a mechanical closure of the macro-crack, identified at around 20 MPa confining pressure, gas permeability continues to decrease as confinement is increased. This means that a model of the macro-crack by two parallel planes (using Poiseuille law) cannot be used to represent permeability variations during closure (or opening) of cracks. As a consequence, a physical model is designed in order to simulate with a better consistency the real behaviour of the macro-crack. This simple modelling allows both behaviours, mechanical and hydraulic, under confining pressure, to be simulated with the same set of parameters.

Automated summary

The effects of confining pressure on macro-cracked concrete samples were studied, revealing that despite mechanical closure of the crack at around 20 MPa, gas permeability continued to decrease as confinement increased. The traditional model using two parallel planes to represent permeability variations during crack closure was found to be inadequate, leading to the development of a new physical model to simulate the real behavior of the macro-crack. This new modeling approach allowed for consistent simulation of both mechanical and hydraulic behaviors under confining pressure using the same set of parameters.