Effect of Degree of Consolidation on Some Important Properties of Concrete


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Title: Effect of Degree of Consolidation on Some Important Properties of Concrete

Author(s): D. Whiting, G. W. Seegebrecht, and S. Tayabji

Publication: Special Publication

Volume: 96


Appears on pages(s): 125-160

Keywords: aggregates; air entrainment; bond (concrete to reinforcement); cement content; compressive strength; concretes; consolidation; freeze-thaw durability; permeability; Materials Research

Date: 1/1/1987

Concretes were prepared at degrees of consolidation varying from 100 to 85 percent. Mixtures were typical of those used for pavement applications with cement factors ranging from 520 to 610 pounds per cubic yard (308 to 360 kg/m3) and air contents ranging from 5 to 9 percent. Additional concretes were intentionally overvibrated to the point of incipient segregation. Test specimens were cast for determination of compressive strength, bond of reinforcing steel to concrete, permeability of concrete to chloride ions, and resistance of concrete to freezing and thawing in water. Results show that compressive strength is reduced by about 30 percent for each 5 percent decrease in degree of consolidation. Bond stress is reduced even more dramatically, suffering a loss of approximately 50 percent for 5 percent reduction in degree of consolidation. Overconsolidation has little apparent effect on compressive strength, and may increase bond strength by virtue of displacement of air in these air-entrained concretes.