Internally cured concrete uses absorptive materials in the mixture that supplement the standard curing practices by supplying moisture to the interior of the concrete (ACI 308R-01). This process adds moisture without affecting the w/cm. The moisture is desorbed for internal moisture augmentation at the time needed to further hydrate the cement. This water addition can be achieved using several materials (Jensen and Lura 2006; Kovler and Jensen 2007)@ including prewetted lightweight aggregate@ super-absorbent particles@ wood fibers@ and absorbent limestone aggregate. This report will focus primarily on the use of prewetted lightweight aggregate.
ACI 308-213R-2013 history
2013ACI 308-213R-2013 Report on Internally Cured Concrete Using Prewetted Absorptive Lightweight Aggregate