Mechanisms governing in-depth infiltration of crack filling solutions in concrete using a magnetic approach

Cracks reduce the strength and service life of concrete structures. Although high-performance crack filling materials are available in market, achieving deep infiltration is often difficult. In this work, we propose the utilization of a magnetic approach for enhanced infiltration and examine the mechanisms governing its effectiveness. Our experiments demonstrate that employing magnetic fields in the milliTesla range can significantly enhance the filling ability of solutions containing <1% by volume of magnetic particles. To facilitate flow observations and gain a deeper understanding of the fundamental mechanisms, we used transparent box samples and guar gum solutions in this study. In line with the objectives of this study, we discuss potential mechanisms relevant to real concrete cracks and crack filling materials. Finally, we provide suggestions for field implementation of the proposed technology, considering the typical characteristics of concrete cracks and structural elements.