In the building sector, concrete is a commonly used material. It needs a large amount of water for curing. This issue can be effectively solved by self-curing (internal curing) of concrete. Self-curing chemicals are employed for curing instead of water. This paper focuses on the effect of self-curing using chemical on concrete's split tensile strength. Polyethylene Glycol (PEG-400) is used as a self-curing agent in the concrete mix in the current investigation. Results show that self-curing is an effective method of curing which results in enhancement in split tensile strength by 36.25% and 18.81% for M20 and M25 grades of concrete respectively in comparison with conventionally cured concrete.