Strength Properties of Steel Fibre Reinforced Concrete in Marine Environment

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Title: Strength Properties of Steel Fibre Reinforced Concrete in Marine Environment

Author(s): N. C. Kothari

Publication: Special Publication

Volume: 124

Issue:

Appears on pages(s): 247-264

Keywords: compressive strength; concretes; corrosion; flexural strength; cracking (fracturing); fiber reinforced concretes; marine atmospheres; mechanical properties; metal fibers; seawater; tensile strength; Materials Research

Date: 9/1/1990

Abstract:
Strength properties of steel fiber reinforced concrete and plain concrete specimens subjected to normal atmospheric exposure and accelerated cyclic testing in marine environment were examined. The concrete mix design consisted of cement:sand:aggregate in ratio of 1:1.96:3.01 with water-cement ratio of 0.6. The steel fibers, 10 mm in length, were added in volume of 0.0, 0.6, and 1.2 percent of the mix. Strength properties--compressive, flexural, and tensile strength of the concrete specimens containing steel fibers--showed considerable improvement over those obtained in the plain concrete exposed to the normal atmospheric condition. Both steel fiber reinforced and plain concrete specimens subjected to accelerated cyclic testing at 60 C, 24-hr cycle in marine environment, showed that the addition of fibers provided considerable improvement in strength properties. However, corrosion of the fibers was observed at or near the surface, and continued to worsen after 20 cycles. Specimens with 1.2 volume percent of steel fibers exhibited the largest increase in compressive and flexural strength in both test conditions, normal atmospheric and accelerated cyclic testing.