Steel Fiber Product Introduction through Pre-Cast Reinforced Concrete Pipe

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Title: Steel Fiber Product Introduction through Pre-Cast Reinforced Concrete Pipe

Author(s): C. N. MacDonald and J. Trangsrud

Publication: Special Publication

Volume: 222

Issue:

Appears on pages(s): 185-199

Keywords: average residual strength tests; pre-cast concrete pipe; steel fiber reinforced concrete

Date: 5/1/2004

Abstract:
This paper presents the introduction of a steel fiber made by a pre-cast manufacturer suitable for plant-produced products and transit-supplied concrete. The fiber con-figuration allows fiber manufacturing to be done in-house as are the other concrete products. Toughness test results indicate equivalent or improved performance with lab mixtures compared with other steel fibers available and tested. Tests were conducted with both wet (laboratory and transit mixture) and dry cast techniques for testing samples and full-scale three-edge bearing tests for dry cast pipe. Performance issues were identifiable for the sample casting techniques, compression strength, maturity, and toughness tests with fiber reinforcement. Pipe tests were conducted for the first visible crack, the first 0.25 mm crack, and the ultimate load with fabric reinforcement only, fiber reinforcement only, and then with both fabric and fiber reinforcements. Concrete mixture proportions for the pipe were constant with three dosages of fiber used: 0.25, 0.50, and 0.75 percent by volume.