Determination of Tension Crack Development in Plastic P.C. Concrete with Retarding Admixtures, MLR-86-12, 1987

(1987) Determination of Tension Crack Development in Plastic P.C. Concrete with Retarding Admixtures, MLR-86-12, 1987. Transportation, Department of

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Abstract

Bridge deck cracking occasionally occurs during construction for any number of reasons. Improper design, concrete placement or deck curing can result in cracks. One contributing factor toward cracking may be dead load deflections induced during concrete placement. For both continuous and non-continuous bridges, specific placement sequences are required to minimize harmful deflections in previously placed sections. Set retarding admixtures are also used to keep previously placed concrete plastic until the pour is completed. The problem is--at what point does movement of the concrete cause permanent damage to the deck. The study evaluated the time to crack formation relationship for mixes with low and high dosages of set retarding admixtures currently approved for use in Iowa state and county projects.

Item Type: Departmental Report
Keywords: Admixtures, Bridge construction, Bridge decks, Cracking, Deflection, Portland cement concrete, Static loads
Subjects: Transportation > Pavements
Transportation
Transportation > Materials
Transportation > Research
Transportation > Research > Concrete
Transportation > Design and Construction
Transportation > Maintenance and preservation
ID Code: 17150
Deposited By: Iowa DOT Library
Deposited On: 09 Jun 2014 14:03
Last Modified: 15 Jan 2015 12:41
URI: http://publications.iowa.gov/id/eprint/17150