History and Evolution of Internal Curing-Case Studies

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Title: History and Evolution of Internal Curing-Case Studies

Author(s): John Roberts, Randy Butcher, Bruce Jones, Max Kalafat, and Ron Vaughn

Publication: Special Publication

Volume: 290

Issue:

Appears on pages(s): 1-12

Keywords: Curing, internal curing, long life, low life cycle cost, saturated-surface-dry

Date: 9/14/2012

Abstract:
First noticed by T. C. Powers, et al in 1948, [22] as beneficial for hydration by supplying water internally, specifiers and contractors in 2012 have grasped how the process of internal curing is implemented, how hydration behaves, and how improvements in mechanical properties, durability, and cost may be beneficial. To meet the time-dependent hydration needs of the concrete, having sufficient water internally available, when, as, and where needed, is vital for achieving optimum characteristic qualities. There is lower life cycle cost with internal curing (IC) and frequently lower first cost. In 2012, the number of projects using internal curing is increasing at an escalating rate, because the process is simple and economically implemented. Pavements, bridges, buildings, and pervious parking lots are being started now in this recession, because specifiers and contractors are saving dollars, as they build longer lasting structures while costs and interest rates are low. Developed initially to reduce autogenous shrinkage in low water-cement ratio and high performance concretes, internal curing has been found to reduce drying shrinkage. Other benefits found include reduced permeability, increased compressive and flexural strengths, less warping, stronger interfacial transition zones, greater durability, and lower carbonation.