Computers and Concrete

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Recovery of mortar-aggregate interface of fire-damaged concrete after post-fire curing

  • Li, Lang (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University) ;
  • Zhang, Hong (Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University) ;
  • Dong, Jiangfeng (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University) ;
  • Zhang, Hongen (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University) ;
  • Jia, Pu (Institute for Disaster Management & Reconstruction, Sichuan University) ;
  • Wang, Qingyuan (Failure Mechanics & Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture & Environment, Sichuan University) ;
  • Liu, Yongjie (Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University)
  • Received : 2019.02.28
  • Accepted : 2019.07.20
  • Published : 2019.09.25
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Abstract

In order to investigate the strength recovery of fire-damaged concrete after post-fire curing, concrete specimens were heating at $2^{\circ}C/min$ or $5^{\circ}C/min$ to 400, 600 and $800^{\circ}C$, and these exposed specimens were soaked in the water for 24 hours and following by 29-day post-fire curing. The compressive strength and split tensile strength of the high-temperature-exposed specimens before and after post-fire curing were tested. The proportion of split aggregate in the split surfaces was analyzed to evaluate the mortar-aggregate interfacial strength. After the post-fire curing process, the split tensile strength of specimens exposed to all temperatures was recovered significantly, while the recovery of compressive strength was only obvious within the specimens exposed to $600^{\circ}C$. The tensile strength is more sensitive to the mortar-aggregate interfacial cracks, which caused that the split tensile strength decreased more after high-temperature exposure and recovery more after post-fire curing than the compressive strength. The mortar-aggregate interfacial strength also showed remarkable recovery after post-fire curing, and it contributed to the recovery of split tensile strength.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

References

  1. Alonso, C. and Fernandez, L. (2004), "Dehydration and rehydration processes of cement paste exposed to high temperature environments", J. Mater. Sci., 39(9), 3015-3024. https://doi.org/10.1023/B:JMSC.0000025827.65956.18.
  2. Behnood, A. and Ghandehari, M. (2009), "Comparison of compressive and splitting tensile strength of high-strength concrete with and without polypropylene fibers heated to high temperatures", Fire Saf. J., 44(8), 1015-1022. https://doi.org/10.1016/j.firesaf.2009.07.001.
  3. Castellote, M., Alonso, C., Andrade, C., Turrillas, X. and Campo, J. (2004), "Composition and microstructural changes of cement pastes upon heating, as studied by neutron diffraction", Cement Concrete Res., 34(9), 1633-1644. https://doi.org/10.1016/S0008-8846(03)00229-1.
  4. Cicekli, U., Voyiadjis, G.Z. and Abu Al-Rub, R.K. (2007), "A plasticity and anisotropic damage model for plain concrete", Int. J. Plast., 23(10-11), 1874-1900. https://doi.org/10.1016/j.ijplas.2007.03.006.
  5. Crook, D.N. and Murray, M.J. (1970), "Regain of strength after firing of concrete", Mag. Concrete Res., 22(72), 149-154. https://doi.org/10.1680/macr.1970.22.72.149.
  6. Culfik, M.S. and O zturan, T. (2010), "Mechanical properties of normal and high strength concretes subjected to high temperatures and using image analysis to detect bond deteriorations", Constr. Build. Mater., 24(8), 1486-1493. https://doi.org/10.1016/j.conbuildmat.2010.01.020.
  7. Elices, M. and Rocco, C.G. (2008), "Effect of aggregate size on the fracture and mechanical properties of a simple concrete", Eng. Fract. Mech., 75(13), 3839-3851. https://doi.org/10.1016/j.engfracmech.2008.02.011.
  8. Felekoglu, B. and Keskinates, M. (2016), "Multiple cracking analysis of HTPP-ECC by digital image correlation method", Comput. Concrete, 17(6), 831-848. https://doi.org/10.12989/cac.2016.17.6.831.
  9. Fu, Y.F., Wong, Y.L., Poon, C.S., Tang, C.A. and Lin, P. (2004a), "Experimental study of micro/macro crack development and stress-strain relations of cement-based composite materials at elevated temperatures", Cement Concrete Res., 34(5), 789-797. https://doi.org/10.1016/j.cemconres.2003.08.029.
  10. Fu, Y.F., Wong, Y.L., Tang, C.A. and Poon, C.S. (2004b), "Thermal induced stress and associated cracking in cement-based composite at elevated temperatures-Part I: Thermal cracking around single inclusion", Cement Concrete Compos., 26(2), 99-111. https://doi.org/10.1016/S0958-9465(03)00086-6.
  11. Fu, Y.F., Wong, Y.L., Tang, C.A. and Poon, C.S. (2004c), "Thermal induced stress and associated cracking in cement-based composite at elevated temperatures-Part II: Thermal cracking around multiple inclusions", Cement Concrete Compos., 26(2), 113-126. https://doi.org/10.1016/S0958-9465(03)00087-8.
  12. Henry, M., Darma, I.S., Haraguchi, Y. and Sugiyama, T. (2013), "Analysis of cracking in high-strength cementitious materials under heating and re-curing using X-ray CT", Third International Conference on Sustainable Construction Materials and Technologies, Tokyo, Japan.
  13. Henry, M., Darma, I.S. and Sugiyama, T. (2014), "Analysis of the effect of heating and re-curing on the microstructure of high-strength concrete using X-ray CT", Constr. Build. Mater., 67, 37-46. https://doi.org/10.1016/j.conbuildmat.2013.11.007.
  14. Henry, M., Suzuki, M. and Kato, Y. (2011), "Behavior of fire-damaged mortar under variable re-curing conditions", ACI Mater. J., 108(3), 281-289.
  15. Hilloulin, B., Hilloulin, D., Grondin, F., Loukili, A. and De Belie, N. (2016), "Mechanical regains due to self-healing in cementitious materials: Experimental measurements and micro-mechanical model", Cement Concrete Res., 80, 21-32. https://doi.org/10.1016/j.cemconres.2015.11.005.
  16. Hwang, C.L., Peng, S.S., Wang, E., Lin, S.H. and Huang, S.L. (2010), "A quantitative measurement of concrete air content using image analyses", Comput. Concrete, 7(3), 239-247. https://doi.org/10.12989/cac.2010.7.3.239.
  17. Karahan, O. (2011), "Residual compressive strength of fire-damaged mortar after post-fire-air-curing", Fire Mater., 35(8), 561-567. https://doi.org/10.1002/fam.1074.
  18. Karatas, M., Balun, B. and Benli, A. (2017), "High temperature resistance of self-compacting lightweight mortar incorporating expanded perlite and pumice", Comput. Concrete, 19(2), 121-126. https://doi.org/10.12989/cac.2017.19.2.121.
  19. Khoury, G.A. (1992), "Compressive strength of concrete at high temperatures: a reassessment", Mag. Concrete Res., 44(161), 291-309. https://doi.org/10.1680/macr.1992.44.161.291.
  20. Kim, G.J. and Kwak, H.G. (2017), "Depth-dependent evaluation of residual material properties of fire-damaged concrete", Comput. Concrete, 20(4), 503-509. https://doi.org/10.12989/cac.2017.20.4.503.
  21. Li, L., Jia, P., Dong, J., Shi, L., Zhang, G. and Wang, Q. (2017a), "Effects of cement dosage and cooling regimes on the compressive strength of concrete after post-fire-curing from $800^{\circ}C$", Constr. Build. Mater., 142, 208-220. https://doi.org/10.1016/j.conbuildmat.2017.03.053.
  22. Li, M., Mao, X., Cao, L., Pu, H. and Lu, A. (2017b), "Influence of heating rate on the dynamic mechanical performance of coal measure rocks", Int. J. Geomech., 17(8), 04017020. https://doi.org/10.1061/(ASCE)GM.1943-5622.0000888.
  23. Li, Q., Yuan, G. and Shu, Q. (2014), "Effects of heating/cooling on recovery of strength and carbonation resistance of fire-damaged concrete", Mag. Concrete Res., 66(18), 925-936. https://doi.org/10.1680/macr.14.00029.
  24. Lin, W.M., Lin, T.D. and Powers-Couche, L.J. (1996), "Microstructures of fire-damaged concrete", ACI Mater. J., 93(3), 199-205.
  25. Lin, Y., Hsiao, C., Yang, H. and Lin, Y.F. (2011), "The effect of post-fire-curing on strengthvelocity relationship for nondestructive assessment of fire-damaged concrete strength", Fire Saf. J., 46(4), 178-185. https://doi.org/10.1016/j.firesaf.2011.01.006.
  26. Liu, S. and Xu, J. (2015), "An experimental study on the physico-mechanical properties of two post-high-temperature rocks", Eng. Geol. 185, 63-70. https://doi.org/10.1016/j.enggeo.2014.11.013.
  27. Ma, Q., Guo, R., Zhao, Z., Lin, Z. and He, K. (2015), "Mechanical properties of concrete at high temperature-A review", Constr. Build. Mater., 93, 371-383. https://doi.org/10.1016/j.conbuildmat.2015.05.131.
  28. Mantellato, S., Palacios, M. and Flatt, R.J. (2016), "Impact of sample preparation on the specific surface area of synthetic ettringite", Cement Concrete Res., 86, 20-28. https://doi.org/10.1016/j.cemconres.2016.04.005.
  29. Park, S.J., Yim, H.J. and Kwak, H.G. (2015), "Effects of post-fire curing conditions on the restoration of material properties of fire-damaged concrete", Constr. Build. Mater., 99, 90-98. https://doi.org/10.1016/j.conbuildmat.2015.09.015.
  30. Peng, S.S., Wang, E.H., Wang, H.Y. and Chou, Y.T. (2012), "Quality assessment of high performance concrete using digitized image elements", Comput. Concrete, 10(4), 409-417. https://doi.org/10.12989/cac.2012.10.4.409.
  31. Piasta, J., Sawicz, Z. and Rudzinski, L. (1984), "Changes in the structure of hardened cement paste due to high temperature", Materiaux Constr., 17(4), 291-296. https://doi.org/10.1007/BF02479085.
  32. Poon, C.S., Azhar, S., Anson, M. and Wong, Y.L. (2001), "Strength and durability recovery of fire-damaged concrete after post-fire-curing", Cement Concrete Res., 31(9), 1307-1318. https://doi.org/10.1016/S0008-8846(01)00582-8.
  33. Sarshar, R. and Khoury, G.A. (1993), "Material and environmental factors influencing the compressive strength of unsealed cement paste and concrete at high temperatures", Mag. Concrete Res., 45(162), 51-61. https://doi.org/10.1680/macr.1993.45.162.51.
  34. Schneider, U. (1988), "Concrete at high temperatures-A general review", Fire Saf. J., 13(1), 55-68. https://doi.org/10.1016/0379-7112(88)90033-1.
  35. Shui, Z., Xuan, D., Wan, H. and Cao, B. (2008), "Rehydration reactivity of recycled mortar from concrete waste experienced to thermal treatment", Constr. Build. Mater., 22(8), 1723-1729. https://doi.org/10.1016/j.conbuildmat.2007.05.012.
  36. Wang, G., Zhang, C., Zhang, B., Li, Q. and Shui, Z. (2015), "Study on the high-temperature behavior and rehydration characteristics of hardened cement paste", Fire Mater., 39(8), 741-750. https://doi.org/10.1002/fam.2269.
  37. Wu, D., Liu, G., Chen, S. and Sun, R. (2015), "An experimental investigation on heating rate effect in the thermal behavior of perhydrous bituminous coal during pyrolysis", J. Therm. Anal. Calorim., 119(3), 2195-2203. https://doi.org/10.1007/s10973-015-4401-y.
  38. Xuan, D.X. and Shui, Z.H. (2011), "Rehydration activity of hydrated cement paste exposed to high temperature", Fire Mater., 35(7), 481-490. https://doi.org/10.1002/fam.1067.
  39. Yang, S.Q., Ranjith, P.G., Jing, H.W., Tian, W.L. and Ju, Y. (2017), "An experimental investigation on thermal damage and failure mechanical behavior of granite after exposure to different high temperature treatments", Geothermics, 65, 180-197.https://doi.org/10.1016/j.geothermics.2016.09.008.
  40. Zhang, Q. and Ye, G. (2012), "Dehydration kinetics of Portland cement paste at high temperature", J. Therm. Anal. Calorim., 110(1), 153-158. https://doi.org/10.1007/s10973-012-2303-9.