Mechanical Interaction between Synthetic Fiber and Cement Base Matrix in FRC Composites.

摘要

In cement-based materials, cement is usually employed to bind other materials together. Different interfaces are thus generated between various media in the resulted materials. It has been well recognized that the interfacial microstructure between cement binder and inclusions is of the greatest importance for the mechanical properties of the composite. Specifically, in fiber reinforced cementitious composites, the composite material properties are especially predominated by the fiber-cement interface due to its influence on the mechanical interactions between fibers and cement matrix. This report summarizes research investigations and findings of a study of the fiber-cement interfacial debond mode, namely strength-based or fracture-based debond modes, and on an issue of interfacial bond property control. These studies have been done with the help of fiber pull-out experiments using an MTS digitally controlled load frame and micromechanical modeling, accompanied by environmental scanning electron microscopy. We expect that such investigations will provide physical insights into the break-down processed occurring at the interphase levels of fiber reinforced cementitious composites. The knowledge, in turn, many serve to achieve fiber reinforced cementitious composites with higher performance.