Evolution and characterization of damage of concrete under freeze-thaw cycles

Abstract

To study the internal damage of concrete under freeze-thaw cycles, concrete strains were measured using embedded strain gauges. Residual strain and coefficients of freezing expansion (CFE) derived from strain-temperature curves were used to quantify the damage degree. The experimental results show that irreversible residual strain increases with the number of freeze-thaw cycles. After 50 cycles, residual strains of C20 and C35 concretes are 320μɛ and 100μɛ in water, and 120 μɛ and 60 μɛ in saline solution, respectively. In lower temperature range (−10 °C to −25 °C) CFE of C20 and C35 concretes decrease by 9.82×10⁻⁶/K and 8.44×10⁻⁶/K in water, and 9.38×10⁻⁶/K and 5.47∼10⁻⁶/K in saline solution, respectively. Both residual strains and CFEs indicate that during the first 50 freeze-thaw cycles, the internal damage of concrete in saline solution is less than that of concrete in water. Thus residual strain and CFE can be used to measure the frost damage of concrete.

Keywords

freeze-thaw cycles / saline solution / strain / residual strain / coefficients of freezing expansion

References

[1] Sahin R, Taşdemir M i, Gül R, . Determination of the Optimum Conditions for Deicing Salt Scaling Resistance of Concrete by Visual Examination and Surface Scaling[J]. Constr. Build Mater., 2010, 24(3): 353-360.

[2] Jacobsen S Scaling and Cracking in Unsealed Freeze/thaw Testing of Portland Cement and Silica Fume Concretes[R], 1995 101

[3] Jacobsen S Scaling and Cracking in Unsealed Freeze/Thaw Testing of Portland Cement and Silica Fume Concretes[R], 1995 101

[4] Penttala V Surface and Internal Deterioration of Concrete due to Saline and Non-saline Freeze-thaw Loads [J]. Cem. Concr. Res., 2006, 36(5): 921-928.

[5] Powers TC The Air Requirements of Frost-resistant Concrete[C]. Proceedings of the Highway Research Board, 1949 1-28.

[6] Powers TC A Working Hypothesis for Further Studies of Frost Resistance of Concrete[J]. Am. Concr. Soc., 1945, 16: 245-271.

[7] Powers TC, Brownyard TC Studies of the Physical Properties of Hardened Portland Cement Paste [J]. Am. Concr. I, 1947, 18: 549-602.

[8] Powers TC, Helmuth RA Theory of Volume Changes in Hardened Portland Cement Paste During Freezing [J]. Proc. Highway Res. Board, 1953, 32(2): 285-297.

[9] Powers TC Void Space as a Basis for Producing Air-entrained Concrete [J]. Am. Concr. Inst., 1954, 25: 741-60.

[10] Penttala V, Al-Neshawy F Stress and Strain State of Concrete during Freezing and Thawing Cycles [J]. Cem. Concr. Res., 2002, 32: 1 407-1 420.

[11] Penttala V Freezing-induced Strains and Pressures in Wet Porous Materials and Especially in Concrete Mortars [J]. Adv. Cem. Based. Mater., 1998, 7: 8-19.

[12] Hasan M, Okuyama H, Sato Y, . Stress-strain Model of Concrete Damaged by Freezing and Thawing Cycles [J]. Adv. Concr. Technol., Japan Concr. Inst., 2004, 2: 89-99.

[13] Wang Z, Yao Y Deformation and Deterioration Analysis of Concrete Exposed to Freeze-Thaw Cycles and Chloride Salt Attack[J]. J. Chin. Ceram. Soc., 2012, 8: 1 134-1 138.

[14] Wang Z, Yao Y, Wang L, . Deformation of Concrete Subject to Freeze-thaw Cycles Combined with Chloride Salt Solution [J]. Inter RILEM Conf CRRR, Cape Town. South Africa, 2012 497-498.

[15] Bishnoi S, Uomoto T Strain-tempreture Hysteresis in Concrete under Cyclic Freeze-thaw Conditions [J]. Cem. Concr. Compos., 2008, 30: 374-380.

[16] Setzer M J Micro-ice-lens Formation in Porous Solid [J]. Colloid. Interf. Sci., 2001, 243: 193-201.

[17] Penttala V Strains and Pressures Induced by Freezing Mortars Exposed in Sodium Chloride Solution[J]. Concr. Sci. Eng., 1999, 1: 2-14.

[18] Wang Z, Yao Y, Wang L Research on the Apparent Thermal Expansion Coefficient of Concrete Subject to Freeze-thaw Cycles and Chloride Salt Attack [J]. Adv. Mater. Res., 2012, 446–449: 3 304-3 310.

[19] Coussy O, Monteiro P Poroelastic Model for Concrete Exposed to Freezing Temperatures[J]. Cem. Concr. Res., 2008 40-48.