Dissertations and Theses @ UNI


Open Access Thesis


Fiber-reinforced concrete;


The problem of this study was to determine the effects of fiber volume, heat treatment of fiber, and use of inorganic accelerators on the static compressive strength of steel fiber reinforced concrete. Seven separate test series using 3" x 6" cylinders were conducted. Each series consisted of 15 cylinders tested in uniaxial compression condition.

The basic design mix for the seven test series was designed to obtain approximately 4,000 PSI compressive strength at the age of 28 days. Type I portland cement and 3/4 inch coarse aggregate were used for the design mix.

DUOFORM steel fiber wire with aspect ration of 46.9 and 3/4 inch length was used having tensile strength of 27,000 to 40,000 PSI. Steel fibers in volume percentages of 1.3, 1.6, 1.9 were used. Calcium chloride and ferric chloride were used as an accelerators.

The result of this study indicated that compressive strength of steel fiber reinforced concrete can be improved over the plain concrete by 12 percent utilizing 1.3% fiber volume. This was found to be the most significant increase. Increasing fiber volume fraction by more than 1.3% in the composite had an adverse effect on compressive strength of the steel fiber reinforced concrete. However the compressive strength of groups containing 1.3% steel fiber in all cases were higher than that of the plain concrete.

Effects of high strength steel fiber on compressive strength of the concrete were found to be similar to that of untreated steel fiber. Both of the inorganic accelerators reduced the compressive strength of the steel fiber reinforced concrete, specially ferric chloride.

Scanning electron microscope (SEM) photographs revealed a crack arresting properties of steel fibers in the matrix. Corrosion of steel fibers was mostly found in a group with calcium chloride.

Year of Submission


Degree Name

Master of Arts


Department of Industrial Technology

First Advisor

Mohammed Fahmy, Chair


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Date Original


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