Cement Microstructure: Fostering Photocatalysis

The singularities and the qualities of the hydrated cement microstructure have been identified by researchers as enhancers to promote photocatalytic processes, mediated by titanium dioxide, to create environment-friendly cement. In this chapter, we intend to expose the microstructural characteristics of cement and those aspects that make it possible for the promotion of photocatalytic activity. Within the inherent complexity of the cement microstructure, we describe a framework of two key elements in the microstructure of this material that affects the promotion of TiO 2 photocatalysis, to offer a more comprehensive view of the physical-chemical processes involved. These elements are: the porosity and the nanostructure of the C-S-H. This framework is also a starting point for future studies that seek to improve the photocatalytic response of titanium dioxide inserted in the cement matrix, as well as to provide implications for the application of photocatalytic cement technology in the construction materials industry.