Concrete inFocus - Spring 2017 - 41

nrmca in focus

Predicting
the Potential
for Plastic
Shrinkage Cracks
Anne Werner, Mark Grinter, Daniel Grote, Bryan Allen and Zack Smith

P

lastic shrinkage cracks are fine cracks that occur on the surface of concrete before
final set. Although not usually structurally detrimental, plastic shrinkage cracks
may be visually unappealing and may impact the long-term durability of concrete.
Plastic shrinkage cracks can occur when the bleed water above a concrete surface completely
evaporates while the concrete is still plastic and not quite strong enough to resist the large
capillary tensile stresses that develop within the paste pore structure. Numerous studies [see
ACI 305R-10, ACI 308R-01, Hover, NRMCA and Uno] have shown that the potential for
plastic shrinkage cracking to occur is a function of the ambient weather conditions, particularly the humidity level and the wind speed, as well as the fresh concrete temperature, and the
curing characteristics associated with individual concrete mix designs. Research and causes
of plastic shrinkage cracking are described in ACI 305R-10 and 308R-01.
As noted in NRMCA's Concrete in Practice document, "CIP 5 - Plastic Shrinkage Cracking,"
the best way to avoid the potential for plastic shrinkage cracks is to know when adverse weather
concrete INFOCUS

ı

41



Table of Contents for the Digital Edition of Concrete inFocus - Spring 2017

From the President’s Desk
Corporate Suite Column
Enviroscene Column
Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Engineering: Specifications for Concrete Construction
Predicting the Potential for Plastic Shrinkage Cracks
2017 Product Preview
Index of Advertisers
Concrete inFocus - Spring 2017 - belly1
Concrete inFocus - Spring 2017 - belly2
Concrete inFocus - Spring 2017 - cover1
Concrete inFocus - Spring 2017 - cover2
Concrete inFocus - Spring 2017 - 3
Concrete inFocus - Spring 2017 - 4
Concrete inFocus - Spring 2017 - 5
Concrete inFocus - Spring 2017 - 6
Concrete inFocus - Spring 2017 - 7
Concrete inFocus - Spring 2017 - 8
Concrete inFocus - Spring 2017 - 9
Concrete inFocus - Spring 2017 - 10
Concrete inFocus - Spring 2017 - From the President’s Desk
Concrete inFocus - Spring 2017 - 12
Concrete inFocus - Spring 2017 - Corporate Suite Column
Concrete inFocus - Spring 2017 - 14
Concrete inFocus - Spring 2017 - 15
Concrete inFocus - Spring 2017 - Enviroscene Column
Concrete inFocus - Spring 2017 - 17
Concrete inFocus - Spring 2017 - Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Concrete inFocus - Spring 2017 - 19
Concrete inFocus - Spring 2017 - 20
Concrete inFocus - Spring 2017 - 21
Concrete inFocus - Spring 2017 - 22
Concrete inFocus - Spring 2017 - 23
Concrete inFocus - Spring 2017 - 24
Concrete inFocus - Spring 2017 - 25
Concrete inFocus - Spring 2017 - 26
Concrete inFocus - Spring 2017 - 27
Concrete inFocus - Spring 2017 - 28
Concrete inFocus - Spring 2017 - 29
Concrete inFocus - Spring 2017 - 30
Concrete inFocus - Spring 2017 - Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Concrete inFocus - Spring 2017 - 32
Concrete inFocus - Spring 2017 - 33
Concrete inFocus - Spring 2017 - 34
Concrete inFocus - Spring 2017 - 35
Concrete inFocus - Spring 2017 - 36
Concrete inFocus - Spring 2017 - Engineering: Specifications for Concrete Construction
Concrete inFocus - Spring 2017 - 38
Concrete inFocus - Spring 2017 - 39
Concrete inFocus - Spring 2017 - 40
Concrete inFocus - Spring 2017 - Predicting the Potential for Plastic Shrinkage Cracks
Concrete inFocus - Spring 2017 - 42
Concrete inFocus - Spring 2017 - 43
Concrete inFocus - Spring 2017 - 44
Concrete inFocus - Spring 2017 - 45
Concrete inFocus - Spring 2017 - 2017 Product Preview
Concrete inFocus - Spring 2017 - 47
Concrete inFocus - Spring 2017 - 48
Concrete inFocus - Spring 2017 - 49
Concrete inFocus - Spring 2017 - 50
Concrete inFocus - Spring 2017 - 51
Concrete inFocus - Spring 2017 - 52
Concrete inFocus - Spring 2017 - 53
Concrete inFocus - Spring 2017 - Index of Advertisers
Concrete inFocus - Spring 2017 - cover3
Concrete inFocus - Spring 2017 - cover4
Concrete inFocus - Spring 2017 - divider1
Concrete inFocus - Spring 2017 - divider2
Concrete inFocus - Spring 2017 - 57
Concrete inFocus - Spring 2017 - 58
Concrete inFocus - Spring 2017 - 59
Concrete inFocus - Spring 2017 - 60
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