Performance Characteristics of Steel Fiber Reinforced Superplasticized Concrete


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Title: Performance Characteristics of Steel Fiber Reinforced Superplasticized Concrete

Author(s): V, Ramakrishnan, W. V. Coy/e, Peter A. Kopac, and Thomas J. Pasko, Jr.

Publication: Special Publication

Volume: 68


Appears on pages(s): 515-534

Keywords: air-entraini compressive strength; d flexural strensth; flow concretes; high-strengt ng agents; air entrainment; cement conte uctility; fiber reinforced concretes; I table tests; fresh concretes; hardened h concretes; nt;

Date: 1/1/1981

This paper presents the results of a laboratory investigation of 47 mixes (31 exploratory mixes and 16 replicate mixes) of superplasticized fiber reinforced concrete. All these mixes were studied for the effect of various parameters such as water-cement ratio, cement content, fiber content, air-entraining agent, and superplasticizer dosage on the plastic and hardened properties of concrete. The fresh concrete was tested for slump, flow table spread, vebe time, air-content and unit weight. The hardened concrete was tested for (i) compressive strength, and (ii) static flexural strength including load deflection curves, toughness index, determination of first crack load and determination of post crack strength. The addition of superplasticizer increased the workability of concrete and it was possible to produce workable high strength concretes with low water-cement ratios. Collating enables the fibers to be easily handled and they could be mixed with aggregates without producing "balling" or tangling during mixing. The static flexural test shows that excellent bond had developed between the fibers and the mortar matrix. The load deflection curves indicate that there is a considerable ductile behavior in the superplasticized fiber reinforced concrete. The addition of hooked and collated fibers increases considerably the post-crack load carrying capacity, the toughness, the energy absorbing capacity resulting In a high ductility of the composite material. The serious drawbacks of high strength concrete namely reduced workability and lack of ductility can be eliminated by adding superplasticizers and steel fibers which will dequately increase the workability and the ductility of the high strength concrete.