ABSTRACT
Chloride transport is a kind of mass transport process which has long history dating back to the 19th century. This chapter provides a detailed review on the basic transport mechanisms of chloride in cement-based materials. Chloride ion can be introduced into concrete in two ways: coming from the ingredients of concrete; penetration from external environment, mainly from seawater and de-icing salt. Chloride ions from the external environment can penetrate into cement-based materials through connected pores. In different circumstances, chloride can be transported into cement-based materials by different mechanisms. When concrete is fully saturated, the transport of chloride in concrete is commonly assumed to be governed by diffusion. The transport of chloride in cement-based materials is a kind of mass transfer which has been an important topic for many disciplines, and a solid knowledge base has been generated in this field.
