It is well known that the microstructure of concrete has a significant role in influencing its properties include strength and durability due to the effect of various parameters like porosity, permeability, and pore size distribution. To achieve high strength and good durability properties, to prevent concrete deterioration, to reduce the capillary porosity and to accomplish a substantial reduction in the total porosity, a need to reduce the gel porosity is required. This leads to a change in the C-S-H structure from porous to more crystalline phase, i.e., change in concrete micro-structure. Therefore, gaining a deeper understanding of how the performance of concrete is impacted by its microstructure is of prime significance. This workshop aims to provide a platform to impart knowledge on the microstructure of concrete and its influence on the behavior of concrete.