Effects of silica fume and steel fiber on chloride ion penetration and corrosion behavior of cement-based composites

Abstract

This project was aimed to evaluate the chloride permeability and corrosion behavior of cement-based composites which comprised fibers and silica fume in the mixes. Resistivity, polarization resistance, ponding and rapid chloride penetration results of specimens were obtained through tests. Test results indicate that resistivity, open circuit potentials and direct current polarization of specimens with w/b ratio of 0.35 are higher than those of specimens with w/b ratio of 0.55. For length-diameter ratio of 65, resistivity and direct current polarization of specimens with fiber length of 35 mm were similar to those of 60 mm. In addition, the open circuit potentials of specimens with fiber length of 60 mm were slightly higher that those of 35 mm. The resistivity decreased with increasing steel fiber content, and the open circuit potential and direct current polarization increased with increasing steel fiber content. The specimens containing silica fume were found to provide higher resistivity, open circuit potentials and direct current polarization than the control specimens. The incorporation of steel fiber and silica fume in composites achieved more significantly decreases in resistivity and increases in direct current polarization than steel fiber composites or silica fume composites. The penetration depth and six-hour total charge passed of specimens for w/b ratio of 0.35 were lower than those for w/b ratio of 0.55. For length-diameter ratio of 65, the penetration depth of specimens for fiber length of 35 mm was similar to that of 60 mm. The penetration depth decreased with increased steel fiber content in the composites. By regression analysis, a good correlation between open circuit potential and direct current polarization, and chloride penetration depth and direct current polarization.

Keywords

resistivity / direct current polarization / chloride penetration / ponding test

References

[1] Oh BH, Cha SW, Jang BS, . Development of High-performance Concrete Having High Resistance to Chloride Penetration [J]. Nucl. Eng. Des. (Switzerland), 2002, 212(1–3): 221-231.

[2] Sahmaran M, Li VC Influence of Microcracking on Water Absorption and Sorptivity of ECC [J]. Mater. Struct., 2009, 42(5): 593-603.

[3] Antoni HT, Saeki N Performance of FRC Against Chloride Penetration under Loading [J]. Proceedings of the JCI, 2004, 26(1): 921-926.

[4] Chang PK, Peng YN, Hwang CL A Design Consideration for Durability of High-performance Concrete[J]. Cem. Concr. Comp., 2001, 23(4): 375-380.

[5] Mehta PK Concrete: Structure, Properties, and Materials[M], 1993 Englewood Cliffs, New Jersey Prentice-Hall

[6] Rapoport J, Aldea CM, Shah SP, . Permeability of Cracked Steel Fiber-reinforced Concrete [J]. J. Mater. Civ. Eng., 2002, 14(4): 355-358.

[7] Han TY, Lin WT, Huang R, . Influence of Polyolefin Fibers on the Engineering Properties of Cement-based Composites Containing Silica Fume [J]. Mater. Des., 2012, 37: 569-576.

[8] Mejia R, Delvasto S, Gutierrez C, . Chloride Diffusion Measured by A Modified Permeability Test in Normal and Blended Cements [J]. Adv. Cem. Res., 2003, 15(3): 113-118.

[9] Al-Amoudi OSB, Maslehuddin M, Shameem M, . Shrinkage of Plain and Silica Fume Cement Concrete under Hot Weather [J]. Cem. Concr. Comp., 2007, 29(9): 690-699.

[10] de Gutierrez RM, Diaz LN, Delvasto S Effect of Pozzolans on the Performance of Fiber-reinforced Mortars[J]. Cem. Concr. Comp., 2005, 27(5): 593-598.

[11] Li H, Zhang MH, Ou JP Abrasion Resistance of Concrete Containing Nano-particles for Pavement[J]. Wear, 2006, 260(11–12): 1 262-1 266.

[12] Song PS, Wu JC, Hwang S, . Assessment of Statistical Variations in Impact Resistance of High-strength Concrete and High-strength Steel Fiber-reinforced Concrete[J]. Cem. Concr. Res., 2005, 35(2): 393-399.

[13] Lin WT, Huang R, Lee CL, . Effect of Steel Fiber on the Mechanical Properties of Cement-based Composites Containing Silica Fume [J]. J. Mar. Sci. Tech., 2008, 16(3): 214-221.

[14] Swaddiwudhipong S, Seow PEC Modeling of Steel Fiber Reinforced Concrete under Multi-axial Loads[J]. Cem. Concr. Res., 2006, 36(7): 1 354-1 361.

[15] Kesner K, Billington SL Investigation of Infill Panels Made from Engineered Cementitious Composites for Seismic Strengthening and Retrofit [J]. J. Struct. Eng., 2005, 131(11): 1 712-1 720.

[16] Cheng A, Huang R, Wu JK, . Influence of GGBS on Durability and Corrosion Behavior of Reinforced Concrete[J]. Mater. Chem. Phys., 2005, 93(2–3): 404-411.

[17] Lee CL, Huang R, Lin WT, . Establishment of the Durability Indices for Cement-based Composite Containing Supplementary Cementitious Materials [J]. Mater. Des., 2012, 37: 28-39.

[18] Cheng A, Huang R, Wu JK, . Effect of Rebar Coating on Corrosion Resistance and Bond Strength of Reinforced Concrete [J]. Constr. Build. Mater., 2005, 19(5): 404-412.

[19] Balouch SU, Forth JP, Granju JL Surface Corrosion of Steel Fiber Reinforced Concrete[J]. Cem. Concr. Res., 2010, 40(3): 410-414.