Strength and Permeability Characteristics of Steel Fibre Reinforced Concrete

The results reported in this paper are the part of an extensive laboratory investigation undertaken to study the effects of fibre parameters on the permeability and strength characteristics of steel fibre reinforced concrete (SFRC). The effect of varying fibre content and curing age on the water permeability, compressive and split tensile strengths of SFRC was investigated using straight steel fibres having an aspect ratio of 65. Samples containing three different weight fractions of 1.0%, 2.0% and 4.0% were cast and tested for permeability and strength after 7, 14, 28 and 60 days of curing. Plain concrete samples were also cast and tested for reference purposes.

Permeability was observed to decrease significantly with the addition of steel fibres and continued to decrease with increasing fibre content and increasing curing age. An exponential relationship was observed between permeability and compressive and split tensile strengths for SFRC as well as PCC. To evaluate the effect of fibre content on the permeability and strength characteristics, the Analysis of Variance (ANOVA) statistical method was used. An a level (probability of error) of 0.05 was used for ANOVA test. Regression analysis was carried out to develop relationship between permeability, compressive strength and curing age.


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References:
[1] Mangat P.S and Gurusamy K. (1987), “Flexural Strength of Steel Fibre
Reinforced Cement Composites”, Journal of Material Science, Vol.22,
3103-3110.
[2] Shah Surendra. P. “Do Fibres Increase the Tensile Strength of Cement-
Based Matrixes?”, ACI Materials Journal, Vol.88, 595-602.
[3] Agarwal R, Singh A.K and Singhal D. ( 1996), “ Effect of Fibre
Reinforcing Index on Compressive and Bond Strength of Steel Fibre
reinforced Concrete”, Jl of Institution of Engineers (India), Civil
Engineering Division, 77 , 37-40.
[4] Singh A.P. and Singhal D. (1998), “Effect of Fibre Shapes on
Compressive and Bond Strengths of SFRC”, Jl of Institution of
Engineers (India), Civil Engineering Division, 79, 136-139.
[5] Kumar V and Singhal D. (1996), “Flexural strength of Reinforced
Concrete Beams Containing Steel Fibres”, Jl of Structural Engineering,
India, V.23, 145-149.
[6] Mangat P.S and Gurusamy K. (1988), “Corrosion Resistance of Steel
Fibres in Concrete under Marine Environment”, Cement and Concrete
Research, 18, 44-54.
[7] Singhal. D, Agrawal. R. and Nautiyal B.D.( 1999), “ Effect of Chloride
Environment on Steel Fibre Reinforced Concrete” , Jl of Institution of
Engineers (I), Civil Engineering Division, V.80, 110-116.
[8] Singhal. D, Agrawal. R. and Nautiyal B.D. (2002), “Sulphate Resistance
of Steel Fibre Reinforced Concrete”, Jl of Ferro-cement, V.32, No.2,
127-137.
[9] Bamforth P.B (1991), “The Water Permeability of Concrete and its
Relationship with Strength”, Magazine of Concrete Research, 43,233-
241.
[10] Min- Hoong Zhang (1991), “Permeability of High Strength Lightweight
Concrete”, ACI Materials Journal, 88, 463-469.
[11] Prasit Soongwang et al (1991), “Factors Affecting Strength and
Permeability of Concrete with Porous Limestone”, ACI Materials
Journal, 88, 400-406.
[12] Lydon I.D. (1994), “Effects of Coarse Aggregate on Relative
Permeability of Concrete”, Construction and Building Materials, 18,
165-189.
[13] Khatri R.P, Sirivivantnanon V. (1997), “Methods for the Determination
of Water Permeability of Concrete”, ACI Materials Jl., 94, 257-261.
[14] Singh A.P., Agarwal Ramji and Singhal D. (2002), “Permeability and
Strength Characteristics of Steel Fibre Reinforced Concrete”, Journal of
Ferrocement, Vol. 32, 127-138.
[15] Ozgur E., Khaled M, “ Effects of limestone crusher dust and steel fibres
on concrete,” Construction and Building Materials, 2009, 23, 981-987
[16] Banthia N., Bhargava A., “Permeability of stressed concrete and role of
fiber reinforcement,” ACI Materials Jl, 2007, 104, 70-76
[17] Gansen N, Sekar R., “Permeability of steel fibre reinforced high
performance concrete composites,” Jl of Institution of Engineers (India),
Civil Engineering Division, 2005, 83, 145-149.
[18] Sun W. Chen, Luo X, Quin H., “The effect of hybrid fibers and
expansive agent on the shrinkage and permeability of high-performance
concrete”, Cement and Concrete Research, 2001, 31, 595-601. [19] IS:8112-1989, “Specifications for High Strength Ordinary Portland
Cement” , Bureau of Indian Standards, New – Delhi, 1990, pp. 1-7.
[20] IS: 383-1970, “Specifications for Coarse and Fine Aggregates from
Natural Sources for Concrete”, Bureau of Indian Standards, New Delhi,
1971, pp. 5-11.
[21] SP: 23-1982, “Handbook of Concrete Mixes”, Bureau of Indian
Standard, New-Delhi, 1983, pp 103-122.
[22] IS: 3065-1965, Method for Determination of Permeability of Concrete.
Bureau of Indian Standards, New Delhi, 1966, pp. 4 -10.
[23] ASTM C 642-1990, “Standard Test Method for Specific Gravity,
Absorption and Voids in Hardened Concrete”, American Society of
Testing of Materials, 315-316.
[24] Kennedy John B., Neville Adam M., “Basic statistical methods for
engineers and scientists”, IEP A Dun-Donnelley Publisher, 1976, New
York, pp. 147-149.
[25] Mangat P.S. and Azari M.M. 1984, A Theory for the Free Shrinkage of
Steel Fibre Reinforced Cement matrices. Jl of Materials Science, 19, pp.
2183-2194.