Title:
Mechanical Properties of Steel Fiber Reinforced Rapid-Set Materials
Author(s):
A. Samer Ezeldin and Steven R. Lowe
Publication:
Materials Journal
Volume:
88
Issue:
4
Appears on pages(s):
384-389
Keywords:
compressive strength; concretes; cracking (fracturing); ductility; fiber reinforced concretes; high early strength cements; mechanical properties; metal fibers; repairs; strength; Materials Research
DOI:
10.14359/1888
Date:
7/1/1991
Abstract:
Structures such as bridge decks, marine structures, and airport runways suffer rapid deterioration due to severe environmental conditions. Structural renovations and concrete repair projects would cause unwanted delays and interruption of services. Use of rapid-set cementing materials to replace traditional cements to perform such maintenance projects was found possible. Rapid-set materials can develop high compressive strength at very early age (6000 psi after 24 hr). Shrinkage cracking resistance and brittleness of such composites can be improved by introducing steel fiber in the matrix. This paper presents an experimental program designed to study the mechanical properties of rapid-set materials reinforced with steel fibers. The primary variables of the study are rapid-set cementing materials, fiber type, and fiber content. Three commercially available rapid-set materials were investigated. Four fiber types made of low-carbon steel were incorporated. Two were hooked at the ends, one was crimped at the ends, and one was crimped throughout the length. Steel fibers were added in quantities of 50, 75, and 100 lb/yd?3. The experimental findings indicate that steel fibers can be successfully mixed with rapid-set materials up to a quantity of 75 lb/yd?3. An increase in the compressive strength, first-crack strength, and flexural strength were obtained. Fibers contribute effectively to the flexural toughness of rapid-set materials. The mechanical properties' enhancement depends on the fiber shape, aspect ratio, and content