Figure 1 is a photo depicting a cracked massive concrete element, with an additional photo inset of a close-up of a crack and a measuring tool 

Fig. 1. Cracked massive element and close-up view of cracking

Mass Concrete Specifications – Two States' Perspectives
Christopher C. Ferraro Ph.D., P.E., University of Florida and Kevin R. Pruski, PE, Texas Department of Transportation
In the mid-to-late 1990s, both the Texas Department of Transportation (TxDOT) and the Florida Department of Transportation (FDOT) began noticing cracking in many of the larger cast-in-place concrete transportation structures.   
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Drilled Shafts as Mass Concrete?
John Gajda, PE, Senior Principal Engineer, CTLGroup, and Jonathan Poole, PhD, PE, Senior Engineer, CTLGroup
We are often asked, ”Should drilled shafts be considered mass concrete?” Historically, drilled shafts and caissons have not been considered mass concrete, except for particular projects with unique considerations or owner requirements..  
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Evaluation of Performance Based Concrete for Bridge Decks in Washington State
Bijan Khaleghi, PhD, PE, SE, Washington State DOT
Bridge decks are not typically classified as mass concrete, but as is the case with mass concrete, the need to reduce or prevent cracking is a high priority.
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