The geochemical features of the interfacial transition zone

The interfacial transition zone (ITZ) is basically a multilayer contact zone on aggregate and is known as the weakest link, influencing both the mechanical properties and durability of concrete. The nature and mechanisms of establishment of the ITZ in concrete have been given great coverage by previous researchers. However, knowledge about the geochemical features of mineral genesis in the ITZ is still inadequate. The purpose of this paper is to document the consequences of aggregate variation on the geochemical features of the ITZ. Additionally, ITZ geochemistry is discussed as a function of the aggregate, including analytical evidence of microchemistry characterisation in the vicinity of the ITZ for normal-strength concrete. The analysis indicates that the granitic and limestone ITZs studied act as dynamic substances that facilitate ionic diffusion during the hydration process. Both types of ITZ show some degree of variation in Si⁴⁺ and Ca²⁺ distribution. The atomic ratio of specific elements in the hydration products also revealed a significant difference between the granitic and limestone ITZs.