Detection of thermophysical properties for high strength concrete after exposure to high temperature

Abstract

Using the detection principle of infrared thermal imaging technique and the detection principle of DRH thermal conductivity tester laboratory, we investigated the infrared thermal image inspection, coefficient of thermal conductivity, apparent density, and compressive strength test on C80 high-strength concrete(HSC) in the presence and absence of polypropylene fibers under completely heated conditions. Only slight damages were detected below 400 °C, whereas more and more severe deterioration events were expected when the temperature was above 500 °C. The results show that the elevated temperature through infrared images generally exhibits an upward trend with increasing temperature, while the coefficient of thermal conductivity and apparent density decrease gradually. Additionally, the addition of polypropylene fibers with appropriate length, diameter, and quantity contributes to the improvement of the high-temperature resistance of HSC.

Keywords

high-strength concrete / polypropylene fiber / high temperature / infrared thermal imaging technique / coefficient of thermal conductivity / compressive strength ratio

References

[1] Du H X. Fire Damage Detection Technology and Eevaluation Theory and Method Reinforced Concrete Construction[D]. 2005 Shanghai: Tongji University.

[2] Hao X. Research on Microstructure and Compressive Performance of High Strength Concrete with Polypropylene Fiber Subjected to High Temperature[D]. 2012 Taiyuan: Taiyuan University of Technology.

[3] Luo S R, Li H. Study on Mechanical Properties and Cracking Behaviors of Fiber Reinforced Self-compacting Concrete [J]. Journal of Guangxi University (Natural Science Edition), 2010, 35(6): 901-907.

[4] Qualicoatknopf. Infrared Technology Principle[M]. 1986 Beijing: National Defense Industry Press.

[5] Chen B R. Infrared System[M]. 1988 Beijing: National Defence Industry Press.

[6] Zhou S Q. Infrared Radiation Measurement Basis[M]. 1991 Shanghai: Shanghai Jiaotong University Press.

[7] Yang C H. Laser and Infrared Technology Handbook[M]. 1990 Beijing: National Defense Industry Press.

[8] Zhang J X. Light and Infrared Imaging Technology[M]. 1995 Beijing: Beijing Institute of Technology Press.

[9] Wu X X. Nondestructive Testing Technology Manual[M]. 2003 Beijing: China Communications Press.

[10] Zhang X H, Ren Z P, Mei F M. Transfer Theory(second edition)[M]. 1985 Beijing: China Building Industry Press.

[11] Wang H F. Research on Mechanical ProPerties of High Strength Concrete with PolyProPylene Fiber Subjected to High Temperature[D]. 2011 Taiyuan: Taiyuan University of Technology.

[12] Huang C K. Fiber Concrete Structure[M]. 2004 Beijing: China Machine Press.

[13] Li M, Qian C X, Sun W. The Varying Rule and the Non-destructive Measuring of High Performance Concrete after Fire[J]. Industrial Construction, 2002, 32(10): 34-36.

[14] Du H X, Zhang X, Han J H. Testing and Analysis on Fired Damage of Concrete by Using Infrared Thermal Image[J]. Journal of Building Materials, 1998, 1(3): 223-226.

[15] Ju Y L, Zhang X. Investigation of Influence of PP Fiber on Performances of HPC under High Temperature[J]. Journal of Building Materials, 2004, 7(1): 25-28.

[16] Zhang Y L, Zhan S L, Qian X, et al. Early Shrinkage Performance Test Study of Polypropylene Fiber Concrete[J]. New Building Materials, 2006, 1: 25-28.

[17] Mehta P K, Monteiro P J M. Concrete: Microstructure Properties and Materials[M]. 2006 New York: McGraw-Hill.

[18] Lu T Q, Zhao G F, Lin Z S, et al. Microscopic Analysis of Long Standing Concrete after High Temperature[J]. Journal of Building Materials, 2003, 6(2): 135-141.

[19] Luo L L. Approximate Expression of Integrated Intensity in X-ray Diffraction Experiment[J]. College Physics, 2004, 23(12): 49-50.