Bond Strength Plain Vs Deformed Bars in Concrete 3

[farhanjnawab]

The bond strength in concrete of a deformed bar generally will be much higher than a smooth or plain deformed bar.. Is this really true? We are about to conduct pull-out tests, but some people suggests that plain bars will have higher strengths..ironic!! Your comments pls

 

[ishvaaag]

http://www.ideals.illinois.edu/search

It had some investigations of bond in tests atop the list... but I didn't saw it curtailed the actual search. Search at the link above for

Bond Characteristics of Model Reinforcement
Gavlin, N.L. (University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign., 1976-04)

Tests of bond between concrete and steel,
Abrams, Duff Andrew, 1880- (University of Illinois at Urbana Champaign, College of Engineering. Engineering Experiment Station., 1913)

UNIVERSITY OF ILLINOIS ENGINEERING EXPERIMENT STATION BULLETIN No. 8 SEPTEMBER 1906 TESTS OF CONCRETE: I. SHEAR; II. BOND. BY ARTHUR N. TALBOT, PROFESSOR OF MUNICIPAL AND SANITARY ENGINEERING AND IN CHARGE OF THEORETICAL AND APPLIED MECHANICS.

Will try to find more modern links later.

 

[Ron]

Deformed bar bond strength is not only better, but more consistent. It is less dependent on mix characteristics and on abberations that might occur during construction, such as foreign material on the surface of the rebar. You get not only the "chemical" bond of cement paste to steel, but the mechanical bond of the deformations.