Field Study of Shrinkage-Compensating Cement Concrete


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Title: Field Study of Shrinkage-Compensating Cement Concrete

Author(s): Frank A. Randall, Jr.

Publication: Special Publication

Volume: 64


Appears on pages(s): 239-258

Keywords: concrete slabs; cracking (fracturing); drying shrinkage; expansive cements; field tests; parking facilities; shrinkage-compensating cements; shrinkage-compensating concretes; slab-on-ground construction; surveys.

Date: 7/1/1980

Reports on a field survey of over 100 projects including parking structures, slabs on ground, and miscellaneous installations that used shrinkage-compensating cement concrete. Fifty nine of the projects were rated on the effectiveness in reducing drying shrinkage cracks and it was concluded that, on average, the cement was very effective. Six years later seventeen of them were re-examined and it was found that the cement was still very effective. Cracks are plotted on several plan drawings. A number of the projects were inspected several times within a year to determine the rate and extent of cracking. Some causes of cracking due to drying shrinkage are discussed. Twelve projects of portland cement concrete were also reported.