Experimental study to optimize self-curing concrete by using light-weight aggregates

The process of curing concrete is important for getting its strength and durability. Self-curing or internal curing is where self-curing materials are added in the concrete mix that can provide internal moisture to better hydrate the cement and thus not dry out. Lightweight aggregates and Polyethylene glycol (PEG) are one of them. The current study has evaluated for self-curing methods in achieving M35 grade concrete strength. In particular, it examines the influence of lightweight aggregates and PEG-400 superplasticizer on various mechanical properties of concrete such as compressive and tensile strength, workability, and microstructure analysis. In this regard, the current study explores the use of Polyethylene glycol (PEG 400) and light weight aggregates as internal curing agents to minimize shrinkage. PEG 400 serves as a moisture-retaining agent in the concrete mix, aiding hydration which subsequently results in increased compressive strength. The replacement of coarse aggregates with lightweight aggregates is done from 25% to 50%. Scanning Electron Microscope (SEM) i.e. microstructural analysis has been utilized to analyse the concrete's microstructure to get an understanding of the interactions between certain elements. From this study decrease in strength has been observed by using the combination of light weight aggregates and PEG 400 as self-curing agents.