Crack control in toppings for precast flat slab bridge deck construction [electronic resource] /
ABSTRACT: This thesis presents the results of several techniques that were evaluated to provide crack control in the cast portion of a precast flat slab bridge. Poor curing techniques and improper placement of the reinforcement has caused excessive shrinkage cracking in a number of flat slab bridges in Florida. In conjunction with the Florida Department of Transportation (FDOT), four full-scale flat slab bridge spans were constructed to test the field performance of the toppings. FDOT guidelines were followed in the design and construction of the decks. The toppings incorporated either steel fibers, synthetic fibers, a steel/synthetic fiber blend, carbon fiber grid, or a shrinkage-reducing admixture. The toppings were monitored visually for cracking for 30 weeks and are currently under observation in Tallahassee, Florida. As of March 2005, no cracks had developed in the toppings, because insufficient tensile stresses were generated.
School:University of Florida
School Location:USA - Florida
Source Type:Master's Thesis
Keywords:bridge concrete deck fiber flat reinforced shrinkage slab
Date of Publication: