Background: The previous studies have focused curing effect of mainly on high
strength concrete, where strict supervision is maintained. This study is based upon general purpose
concreting work for commercial and residential construction in absence of skilled manpower and
Objective: The objective of this study is to establish a thumb rule to provide 7 days initial curing
for maintaining quality for unsupervised concreting irrelevant to type of cement and grading.
Methods: In this study concrete samples made with locally available commercial cements were
cured for various initial exposure.
Results: The results shows that concrete cured after a gap of 4 days from the time of de-moulding
have given lowest strength as compared to concrete cured in standard practices i.e. where proper
curing protocol had been followed.
Conclusion: Initial curing is most important aspect of gaining desired strength. The findings
after this study shows that curing affects the strength of concrete in variable grading.
Initial curing has great importance for concrete with all types of Portland cement. Concrete
with supplementary cementitious materials gives lowest strength initially but results
higher strength after 28 days as compared to Portland cement.