fibers. types of fibers n steel n glass n synthetic n natural
TRANSCRIPT
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Fibers
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Fibers
Types of Fibers
Steel Glass Synthetic Natural
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Fibers
Effects of Different Fibers on Concrete Properties
Effect Type of Fiber
Reduced plastic shrinkage cracking
Synthetic,
Steel
Increased tensile strength
Glass,
Steel,
Carbon
Increased flexural strength
Steel,
Glass
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Fibers
Steel Fibers
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Fibers
Properties of Steel Fibers
Relative density
Diameter, µm
(0.001 in.)
Tensile strength, MPa (ksi)
Modulus of elasticity, MPa (ksi)
Strain at failure, %
7.80 100-1000 500-2600 210,000 0.5-3.5
(4-40) (70-380) (30,000)
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Fibers
Application and Fabrication Methods of Steel Fibers
Conventionally mixed—used for Overlays
Shotcrete Stabilization of rockslopes Tunnel linings Coal mine shaft linings
Slurry Infiltrated Fiber Concrete
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Fibers
Slurry-Infiltrated Concrete (SIFCON)
Cement 1000 kg/m3
(1686 lb/yd3)
Water330 kg/m3
(556 lb/yd3)
Siliceous Sand 0.7 mm
860 kg/m3 (1450 lb/yd3)
Silica Slurry13 kg/m3 (1.3
lb/yd3)
High-Range Water Reducer
35 kg/m3 (3.7 lb/yd3)
Steel Fibers (about 10 Vol.-%)
800 kg/m3 (84 lb/yd3)
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Fibers
Glass Fibers
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Fibers
Properties of Glass Fibers
Glass fiber type
Relative density
Diameter, µm (0.001
in.)
Tensile strength, MPa (ksi)
Modulus of elasticity, MPa (ksi)
Strain at failure,
%
E 2.54 8-15 2000-4000 72,000 3.0-4.8
(0.3-0.6) (290-580) (10,400)
AR 2.70 12-20 1500-3700 80,000 2.5-3.6
(0.5-0.8) (220-540) (11,600)
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Fibers
Synthetic Fibers
Acrylic Aramid Carbon Nylon Polyester Polypropylene
(Photo)
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Fibers
Properties of Synthetic Fibers
Synthetic fiber type
Relative density
Diameter, µm
Tensile strength,
MPaModulus of
elasticity, MPa
Strain at failure,
%
Acrylic 1.18 5-17 200-1000 17,000-19,000 28-50
Aramid 1.44 10-12 2000-3100 62,000-120,000 2-3.5
Carbon 1.90 8-0 1800-2600 230,000-380,000 0.5-1.5
Nylon 1.14 23 1000 5,200 20
Polyester 1.38 10-80 280-1200 10,000-18,000 10-50
Poly-ethylene
0.96 25-1000 80-600 5,000 12-100
Poly-propylene
0.90 20-200 450-700 3,500-5,200 6-15
Metric
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Fibers
Properties of Synthetic Fibers
Synthetic fiber type
Relative density
Diameter, 0.001 in.
Tensile strength, ksi
Modulus of elasticity, ksi
Strain at failure, %
Acrylic 1.18 0.2-0.7 30-145 2,500-2,800 28-50
Aramid 1.44 0.4-0.47 300-450 9,000-17,000 2-3.5
Carbon 1.90 0.3-0.35 260-380 33,400-55,100 0.5-1.5
Nylon 1.14 0.9 140 750 20
Polyester 1.38 0.4-3.0 40-170 1,500-2,500 10-50
Poly-
ethylene0.96 1-40 11-85 725 12-100
Poly-
propylene0.90 0.8-8 65-100 500-750 6-15
Inch-Pound
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Fibers
Properties of Natural Fibers
Natural fiber type
Relative density
Diameter, µm (0.001
in.)
Tensile strength, MPa (ksi)
Modulus of elasticity, MPa (ksi)
Strain at failure,
%
Wood cellulose
1.5025-125
(1-5)350-2000 (51-290)
10,000-40,000 (1,500-5,800)
Sisal280-600 (40-85)
13,000-25,000 (1,900-3,800)
3.5
Coconut 1.12-1.15100-400
(4-16)120-200 (17-29)
19,000-25,000 (2,800-3,800)
10-25
Bamboo 1.5050-400
(2-16)350-500 (51-73)
33,000-40,000 (4,800-5,800)
Jute 1.02-1.04100-200
(4-8)250-350 (36-51)
25,000-32,000 (3,800-4,600)
1.5-1.9
Elephant grass
425 180 (17)4,900
(26)4,900
(710)3.6