Title:
Properties of Fiber Reinforced Structural Lightweight Concrete
Author(s):
P. Balaguru and Andrew Foden
Publication:
Structural Journal
Volume:
93
Issue:
1
Appears on pages(s):
62-78
Keywords:
air-entraining agents; compression; expanded shale aggre-gates;
fiber reinforced concrete; flexural strength; modulus of elasticity; sil-ica
fume; splitting tensile strength; structural lightweight concretes;
toughness; water-reducing agents.
DOI:
10.14359/9833
Date:
1/1/1996
Abstract:
Results of an experimental investigation of the behavior of fiber reinforced structural lightweight concrete are presented in this paper. Properties investigated include workability and behavior under compression, splitting tension, and Jlexure. The independent variables were composition of fine aggregate, fiber content, fiber length, and presence of silica fume. Fine aggregate consisted of all lightweight aggregate or combinations of light-weight aggregate and natural sand. Two fiber lengths of 50 and 60 mm (2.0 and 2.4 in.) were investigated at fiber contents of 45, 60, and 90 kg/m3 (75, 100, and 150 lb/yd3). The lightweight aggregate used was made of expanded shale and the maximum size was 19 mm (0.75 in.). High-range water-reducing admixture was used to improve workability. An air-entraining admixture was used both to reduce the unit weight and improve workability. Results indicate that a compressive strength of about 42 MPa (6000 psi) can be obtained for concretes with an equilibrium density of 1650 kg/m3 (105 lb/fi3). Fibers increase flexural and splitting tensile strengths substan-tially. The modulus of elasticity is enhanced by about 30 percent. Fiber reinforced concrete exhibits excellent ductility.