DOI QR코드

DOI QR Code

Numerical investigation on tortuosity of transport paths in cement-based materials

  • Zuo, Xiao-Bao (Department of Civil Engineering, Nanjing University Of Science & Technology) ;
  • Sun, Wei (Jiangsu Key Laboratory of Construction Materials, Southeast University) ;
  • Liu, Zhi-Yong (College of Civil Engineering, Yantai University) ;
  • Tang, Yu-Juan (Department of Civil Engineering, Nanjing University Of Science & Technology)
  • 투고 : 2012.01.10
  • 심사 : 2013.11.10
  • 발행 : 2014.03.28

초록

Based on the compositions and structures of cement-based materials, the geometrical models of the tortuosity of transport paths in hardened cement pastes, mortar and concrete, which are associated with the capillary porosity, cement hydration degree, mixture particle shape, aggregate volume fraction and water-cement ratio, are established by using a geometric approach. Numerical simulations are carried out to investigate the effects of material parameters such as water-cement ratio, volume fraction of the mixtures, shape and size of aggregates and cement hydration degree, on the tortuosity of transport paths in hardened cement pastes, mortar and concrete. Results indicate that the transport tortuosity in cement-based materials decreases with the increasing of water-cement ratio, and increases with the cement hydration degree, the volume fraction of cement and aggregate, the shape factor and diameter of aggregates, and the material parameters related to cement pastes, such as the water-cement ratio, cement hydration degree and cement volume fraction, are the primary factors that influence the transport tortuosity of cement-based materials.

키워드

참고문헌

  1. Amiri, O., Ait-Mokhtar, A. and Sarhani, M. (2005), "Tri-dimensional modeling of cementitious materials permeability from polymodal pore size distribution obtained by mercury intrusion porosimetry tests", Adv Cem. Res, 17(1), 39-45. https://doi.org/10.1680/adcr.2005.17.1.39
  2. Barksdale, R.D. and Kemp, M.A. (1991), Sheffield W J, Hubbard J L. Measurement of aggregate shape, surface area, and roughness, Transportation Research Record 1301, National Research Council, Washington, D.C., 107-116.
  3. Barrande, M., Bouchet, R. and Denoyel, R. (2007), "Tortuosity of porous particles", Analy. chem., 79(23), 9115-9121. https://doi.org/10.1021/ac071377r
  4. Beaudoin, J.J., Feldman, R.F. and Tumidajski, P.J. (1994), "Pore structure of hardened portland cement pastes and its influence on properties", Adv. Cem. Based Mater., 1, 224-236. https://doi.org/10.1016/1065-7355(94)90028-0
  5. Bejaoui, S. and Bary, B. (2009), "Modeling of the link between microstructure and effective diffusivity of cement pastes using a simplified composite model", Cement Concrete Res., 37(3), 469-480.
  6. Bentz, D.P., Quenard, D.A., Kunzel, H.M., Baruchel, J., Peyrin, F., Martys, N.S. and Garboczi, E.J. (2000), "Microstructure and transport properties of porous building materials. II: three-dimensional X-ray tomographic studies", Mater. Struct., 33, 147-153. https://doi.org/10.1007/BF02479408
  7. Bertron, A., Duchesne, J. and Escadeillas, G. (2005), "Attack of cement pastes exposed to organic acids in manure", Cement Concrete Compos., 27(9-10), 898-909. https://doi.org/10.1016/j.cemconcomp.2005.06.003
  8. Carman, P.C. (1937), "Fluid flow through a granular beds", Tran. Inst. Chem. Eng., 15, 150.
  9. Chen, D. and Mahadevan, S. (2007), "Cracking analysis of plain concrete under coupled heat transfer and moisture transport processes", J. Struct. Eng.-ASCE, 133(3), 400-410. https://doi.org/10.1061/(ASCE)0733-9445(2007)133:3(400)
  10. Chen, Y.B. and Xu, P.T. (2003), "Study on expression of morphology of cement particles", Cement, 2, 17-19 (in Chinese).
  11. Coleman, S.W. and Vassilicos, J.C. (2008), "Tortuosity of unsaturated porous fractal materials", Phy. Review E, 78(016308), 1-11.
  12. Coussy, O. and Ulm, F.J. (2001), "Elements of durability mechanics of concrete structures", Proceeding of Creep, Shrinkage and Durability Mechanics of Concrete and other Quasi-Brittle Materials, Amsterdam, Netherlands, 3993-4009.
  13. Dullien, F.A.L. (1979), Porous media, fluid transport and pore structure, San Diega, CA: Academic.
  14. Garrabrants, A.C. and Kosson, D.S. (2003), "Modeling moisture transport from a Portland cement-based material during storage in reactive and inert atmospheres", Drying Technol., 21(5), 775-805. https://doi.org/10.1081/DRT-120021686
  15. Garrouch, A.A., Ali, L. and Qasem, F. (2001), "Using diffusion and electrical measurements to assess tortuosity of porous media. Materials and Interfaces", Ind. Eng. Chem. Res., 40, 4363-4369. https://doi.org/10.1021/ie010070u
  16. Guneyisi, E., Gesoglu, M. and Mermerdas, K. (2010), "Strength deterioration of plain and metakaolin concretes in aggressive sulfate environments", J. Mater. Civ. Eng., 22(4), 403-407. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000034
  17. Igarashi, S., Kawamura, M. and Watanabe, A. (2004), "Analysis of cement pastes and mortars by a combination of backscatter-based SEM image analysis and calculations based on the Powers model", Cement Concrete Compos., 26, 977-985. https://doi.org/10.1016/j.cemconcomp.2004.02.031
  18. Marchand, J., Samson, E., Maltais, Y., Lee, R.J. and Sahu, S. (2002), "Predicting the Performance of Concrete Structures Exposed to Chemically Aggressive Environment-Field Validation", Mater. Struct., 35(3), 623-631.
  19. Masi, M., Colella, D., Radaelli, G. and Bertolini, L. (1997), "Simulation of chloride penetration in cement-based materials", Cement. Concrete Res., 27(10), 1951-1601.
  20. Matte, V., Moranville, M. and Adenot, F. (2000), "Simulated microstructure and transport properties of ultra-high performance cement-based materials", Cement. Concrete Res., 30(12), 1947-1954. https://doi.org/10.1016/S0008-8846(00)00288-X
  21. Mora, C.F. and Kwan, A.K.H. (2000), "Sphericity, shape factor, and convexity measurement of coarse aggregate for concrete using digital image processing", Cement. Concrete Res., 30(3), 351-358. https://doi.org/10.1016/S0008-8846(99)00259-8
  22. Moranville, M., Kamali, S. and Guillon, E. (2004), "Physicochemical equilibria of cement-based materials in aggressive environments-experiment and modeling", Cement. Concrete Res., 34(9), 1569-1578. https://doi.org/10.1016/j.cemconres.2004.04.033
  23. Nakarai, K., Ishida, T. and Maekawa, K. (2006), "Modeling of calcium leaching from cement hydrates coupled with micro-pore formation", J. Adv. Concr. Technol., 4(3), 395-407. https://doi.org/10.3151/jact.4.395
  24. Nakashima, Y. and Kamiya, S. (2007), "Mathematica programs for the analysis of three dimensional pore connectivity and anisotropic tortuosity of porous rocks using X-ray microtomography", J. Nucl. Sci. Technol., 44 (9), 1233-1247. https://doi.org/10.1080/18811248.2007.9711367
  25. Neithalath, N., Sumanasooriya, M.S. and Deo, O. (2010), "Characterizing pore volume, sizes, and connectivity in pervious concretes for permeability prediction", Mater. Charact., 61(8), 802-813. https://doi.org/10.1016/j.matchar.2010.05.004
  26. Promentilla, M.A.B. and Sugiyama, T. (2007), "Evaluation of tortuosity of cement-based materials with X-ray synchrotron radiation microtomography", Proceedings of the 1st International Conference on Recent Advances in Concrete Technology, Washington D C, USA, 101-112.
  27. Promentilla, M.A.B., Sugiyama, T., Hitomi, T. and Takeda, N. (2009), "Quantification of tortuosity in hardened cement pastes using synchrotron-based X-ray computed microtomography", Cement Concr. Res., 39, 548-557. https://doi.org/10.1016/j.cemconres.2009.03.005
  28. Quenard, D.A., Xu, K., Kunzel, H.M., Bentz, D.P. and Martys, N.S. (1998), "Microstructure and transport properties of porous building materials", Mater. Struct., 31, 317-324. https://doi.org/10.1007/BF02480673
  29. Shin, K.J., Kim, J.S. and Lee, K.M. (2011), "Probability-based durability design software for concrete structures subjected to chloride exposed environments", Comput. Concr., 8(5), 511-524. https://doi.org/10.12989/cac.2011.8.5.511
  30. Stroeven, P. (2000), "A stereological approach to roughness of fracture surfaces and tortuosity of transport paths in concrete", Cement. Concrete Compos., 22, 331-341. https://doi.org/10.1016/S0958-9465(00)00018-4
  31. Stroeven, P., Hu, J. and Guo, Z. (2009), "Shape assessment of particles in concrete technology: 2D image analysis and 3D stereological extrapolation", Cement Concrete Compos., 31, 84-91. https://doi.org/10.1016/j.cemconcomp.2008.09.006
  32. Taleb, A.R., Masad, E., Tutumluer, E. and Pan, T. (2007), "Evaluation of image analysis techniques for quantifying aggregate shape characteristics", Constr. Build. Mater., 21(5), 978-990. https://doi.org/10.1016/j.conbuildmat.2006.03.005
  33. Weerts, A.H., Kandhai, D. and Bouten, W. (2001), "Tortuosity of an unsaturated sandy soil estimated using gas diffusion and bulk soil electrical conductivity: comparing analogy-based models and lattice-boltzmann simulations", Soil. Sci. Soc. Amer. J., 65(6), 1577-1584. https://doi.org/10.2136/sssaj2001.1577
  34. Yamaguchi, T., Negishi, K., Hoshino, S. and Tanaka, T. (2009), "Modeling of diffusive mass transport in micropores in cement based materials", Cement Concrete Res., 39, 1149-1155. https://doi.org/10.1016/j.cemconres.2009.08.012
  35. Yoon, I.S. (2009), "Simple approach to calculate chloride diffusivity of concrete considering carbonation", Comput. Concr., 6(1), 1-18. https://doi.org/10.12989/cac.2009.6.1.001
  36. Zhang, W.M., Sun, W. and Chen, H.S. (2010), "3D visualisation of pore structures in cement-based materials by LSCM", Adv. Cement Res., 22(1), 53-57. https://doi.org/10.1680/adcr.2008.22.1.53
  37. Zheng, J.J. and Zhou, X.Z. (2008), "Analytical method or prediction of water permeability of cement paste", ACI Mater. J., 105(2), 200-206.
  38. Zuo, X.B. (2010), Modeling and Numerical Investigation on Diffusion-reaction Behaviors in Concrete Subjected to Couplings of Sulfate Attack and Mechanical Loading, Postdoctoral Research Report, College of Materials Science and Engineering, Southeast University, Nanjing, China, 18-31.
  39. Zuo, X.B., Sun, W., Li, H. and Zhou, W.J. (2011), "Geometrical models for tortuosity of transport paths in hardened cement pastes", Adv. Cement Res., 24(3), 145-154.
  40. Zuo, X.B., Sun, W. and Yu, C. (2010), "Modeling of ion diffusion coefficient in saturated concrete", Comput. Concr., 7(5), 421-435. https://doi.org/10.12989/cac.2010.7.5.421

피인용 문헌

  1. Numerical investigation on gypsum and ettringite formation in cement pastes subjected to sulfate attack vol.19, pp.1, 2014, https://doi.org/10.12989/cac.2017.19.1.019