Experimental Study on Temperature Response in Damaged Concrete under Atmospheric Environment

Abstract:

The temperature field in concrete has a significant influence on durability of concrete structures. Meanwhile, there is always damage caused by loads in concrete of a real structure, which affects heat transfer and temperature field. In this paper, the tests on temperature response to heating and cooling as well as moisture transport in concrete with different damage levels were carried out. Five concrete specimens were compressed under uniaxial load to 25%, 40%, 55%, 70% or 85% of the compressive strength, corresponding to different damage levels. One concrete specimen was not subjected to any load, as a comparison specimen. The internal temperature in concrete specimens during heating or cooling process was measured by an embedded humidity and temperature sensor. Thermal conductivity of concrete is the key parameter in denoting the ability of concrete to transfer heat and decreases with the increasing damage level. When the temperature gradient exists in both sides of concrete, the moisture transport will occur in the heat transfer direction. Regardless of heating or cooling process, there is always a hysteresis effect and the temperature response rate changes quickly in the initial stage and decreases gradually with time in damaged concrete. The greater the initial temperature difference is, the greater the initial temperature response rate is. In the same initial temperature difference, the temperature response rate decreases slightly with the increasing damage level, while the moisture transport mass increases evidently.

• Periodical: Key Engineering Materials (Volume 711)
• Pages: 404-411
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.711.404
• Online since: September 2016
• Authors: Hong Guang Min, Wei Ping Zhang*, Xiang Lin Gu
• Keywords: Atmospheric Environment, Damaged Concrete, Moisture Transport, Temperature Response

References

[1] A.V. Saetta, B.A. Schrefler, R.V. Vitaliani, The carbonation of concrete and the mechanism of moisture, heat and carbon dioxide flow through porous materials, Cem. Concr. Res. 23(4) (1993) 761-772.

DOI: 10.1016/0008-8846(93)90030-d

[2] F. Vodák, K. Trtík, O. Kapičková, Š. Hošková, P. Demo, The effect of temperature on strength-porosity relationship for concrete, Constr. Build. Mater. 18(7) (2004) 529-534.

DOI: 10.1016/j.conbuildmat.2004.04.009

[3] T. Liu, R.W. Weyers, Modeling the dynamic corrosion process in chloride contaminated concrete structures, Cem. Concr. Res. 28(3) (1998) 365-379.

DOI: 10.1016/s0008-8846(98)00259-2

[4] E. Samson, J. Marchand, Modeling the effect of temperature on ionic transport in cementitious materials, Cem. Concr. Res. 37(3) (2007) 455-468.

DOI: 10.1016/j.cemconres.2006.11.008

[5] S. Caré, Effect of temperature on porosity and on chloride diffusion in cement pastes, Constr. Build. Mater. 22(7) (2008) 1560-1573.

DOI: 10.1016/j.conbuildmat.2007.03.018

[6] T.S. Nguyen, S. Lorente, M. Carcasses, Effect of the environment temperature on the chloride diffusion through CEM-I and CEM-V mortars: an experimental study, Constr. Build. Mater. 23(2) (2009) 795-803.

DOI: 10.1016/j.conbuildmat.2008.03.004

[7] M.M. Nassar, The effect of environmental temperature on the corrosion of reinforced concrete, Corros. Prev. Control. 44(6) (1997) 167-172.

[8] V. Živica, L. Krajči, L. Bágel, M. Vargová, Significance of the ambient temperature and the steel material in the process of concrete reinforcement corrosion, Constr. Build. Mater. 11(2) (1997) 99-103.

DOI: 10.1016/s0950-0618(97)00001-9

[9] R. Lyons, M. Ing, S. Austin, Influence of diurnal and seasonal temperature variations on the detection of corrosion in reinforced concrete by acoustic emission, Corros. Sci. 47(2) (2005) 413-433.

DOI: 10.1016/j.corsci.2004.06.010

[10] M. Pour-Ghaz, O.B. Isgor, P. Ghods, The effect of temperature on the corrosion of steel in concrete. Part 1: simulated polarization resistance tests and model development, Corros. Sci. 51(2) (2009) 415-425.

DOI: 10.1016/j.corsci.2008.10.034

[11] M. Pour-Ghaz, O.B. Isgor, P. Ghods, The effect of temperature on the corrosion of steel in concrete. Part 2: model verification and parametric study, Corros. Sci. 51(2) (2009) 426-433.

DOI: 10.1016/j.corsci.2008.10.036

[12] A. Neville, Chloride attack of reinforced concrete: an overview, Mater. Struct. 28(2) (1995) 63-70.

[13] V.G. Papadakis, C.G. Vayenas, M.N. Fardis, Physical and chemical characteristics affecting the durability of concrete, ACI Mater. J. 88(2) (1991) 186-196.

[14] Life-365. Life-365 service life prediction model and computer program for predicting the service life and life-cycle cost of reinforced concrete exposed to chlorides, Version 2. 1, (2012).

[15] Y.S. Ji, Y.S. Yuan, J.L. Shen, S.P. Shao, Q. Li, Model for predicting steel corrosion rates of concrete rebar over time, J. China University of Mining & Technology. 40(3) (2011) 339-344 (in Chinese).

[16] C. Andrade, C. Alonso, J. Sarría, Corrosion rate evolution in concrete structures exposed to the atmosphere, Cem. Concr. Compos. 24(1) (2002) 55-64.

DOI: 10.1016/s0958-9465(01)00026-9

[17] Y.S. Yuan, J.H. Jiang, Prediction of temperature response in concrete in a natural climate environment, Constr. Build. Mater. 25(8) (2011) 3159-3167.

[18] W.P. Zhang, H.G. Min, X.L. Gu, Y. Xi, Y.S. Xing, Mesoscale model for thermal conductivity of concrete, Constr. Build. Mater. 98(11) (2015) 8-16.

[19] D. Campbell-Allen, C.P. Thorne, The thermal conductivity of concrete, Mag. Concr. Res. 15(43) (1963) 39-48.

[20] T.Z. Harmathy, Thermal properties of concrete at elevated temperature, J. Mater. 5(1) (1970) 47-74.

[21] T.Z. Harmathy, L.W. Allen, Thermal properties of selected masonry unit concretes, ACI J. Proc. 70(2) (1973) 132-142.

[22] Y.S. Xu, D.D.L. Chung, Increasing the specific heat of cement paste by admixture surface treatments, Cem. Concr. Res. 29(7) (1999) 1117-1121.

DOI: 10.1016/s0008-8846(99)00080-0

[23] M.I. Khan, Factors affecting the thermal properties of concrete and applicability of its prediction models, Build. Environ. 37(6) (2002) 607-614.

DOI: 10.1016/s0360-1323(01)00061-0

[24] K. Kim, S. Jeon, J. Kim, S. Yang, An experimental study on thermal conductivity of concrete, Cem. Concr. Res. 33(3) (2003) 363-371.