Title:
Curing Efficiency of Internally Cured Concrete—TechNote (ACI PRC-213.1-24)
Author(s):
Publication:
Concrete International
Volume:
48
Issue:
8
Appears on pages(s):
37-41
Keywords:
Internal curing, curing-affected zone, durability, FLWAs
DOI:
Date:
8/1/2026
Abstract:
This TechNote describes a process for determining equivalent curing durations for concrete made using conventional external curing and internal curing using prewetted FLWAs in ordinary portland cement (OPC) and SCM systems. A steel trowel was used to screed and finish the sample surface. In this process, equivalent performance is defined by the depth of the curing-affected zone (CAZ). However, the impact of the surface finishing method on the CAZ was not examined. The criteria presented offer one approach that can be used to determine the duration of external curing that is equivalent to internal curing. This would allow any benefits of using internally cured concrete on construction time to be quantified.
Related References:
ACI PRC-308-16—Guide to External Curing of Concrete
ACI PRC-(308-213)-13(22)—Report on Internally Cured Concrete Using Prewetted Absorptive Lightweight Aggregate
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