Mechanical properties of concrete depend on the curing condition of concrete. The ACI-308(2010) through ACI-308(2014) Code states that “internal curing refers to the process by which the hydration of cement occurs because of the availability of additional internal water that is not part of the mixing Water”, curing concrete means that water is not lost from the surface i.e., curing is taken to happen from the outside to inside. In contrast, internal curing is allowing for curing ‘from the inside to outside. Internal curing’ is often also referred as ‘Self–curing.’ Any negligence in curing will interfere in the strength and durability of concrete. Shrinkage reducing agents and lightweight aggregates such as Leca and Polyethylene-glycol, Silica fume and stone chips are used respectively to achieve effective curing results. It is observed that there is an increase in compressive strength by using polyethylene glycol (PEG) and light weight fine aggregate (LWA).