Fracture analysis of concrete using scanning electron microscopy

Abstract

A special experimental technique has been developed that enables the preservation of the compressive stress-induced microcracks in concrete as they exist under applied loads. This technique involves injecting a molten-metal alloy into the induced cracks and solidifying it before unloading. Scanning electron microscopy was employed to capture images from the cross sections of the concrete specimens. These images were then used to study the generation and interaction of the compressive stress-induced microcracks and the effect of confinement on microcrack behavior.