DOI QR코드

DOI QR Code

Hydration and time-dependent rheology changes of cement paste containing ground fly ash

  • Chen, Wei (State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology) ;
  • Huang, Hao (School of Materials Science and Engineering, Wuhan University of Technology)
  • 투고 : 2011.09.22
  • 심사 : 2012.03.19
  • 발행 : 2013.01.25

초록

The use of ground fly ash in concrete can increase the risk of slump loss due to the drastic surface change of the particles after the grinding treatment and the accelerated reaction compared to the untreated ash. This study is aimed at the early age hydration and time-dependent rheology changes of cement paste containing ground fly ash. An original fly ash is ground into different fineness and the hydration of cement paste containing the ground fly ash is monitored with the ultrasound propagation method. The zeta potentials of the solid particles are measured and the changes of rheological parameters of the cement pastes with time are analyzed with a rheometer. A particle packing model is used to probe packing of the solid particles. The results show that the early age hydration of the paste is strongly promoted by replacing Portland cement with fly ash up to 30 percent (by mass), causing increase of the yield stress of the paste. The viscosity of a paste containing ground fly ash is lower than that containing the untreated ash, which is explained by the denser packing of the solid particles.

키워드

참고문헌

  1. Andreasen, A.H.M. and Andersen, J. (1930), "Relation between grain size and interstitial space in products of unconsolidated granules", Kolloid-Z, 50, 271-278. https://doi.org/10.1007/BF01422993
  2. Banfill, P.F.G. (1994), "Rheological methods for assessing the flow properties of mortar and related materials", Constr. Build. Mater., 8(1), 43-50. https://doi.org/10.1016/0950-0618(94)90007-8
  3. Borsoi, A., Collepardi, S., Coppola, L., Troli, R. and Collepardi, M. (2000), "Effect of superplasticizer type on the performance of high-volume fly ash concrete", Proceedings of the Sixth CANMET/ACI International Conference, SP-195, 17-28.
  4. Brouwers, H.J.H. and Radix, H.J. (2005), "Self-compacting concrete: The role of the particle size distribution", 1st International Symposium on Design, Performance and Use of Self-Consolidating Concrete, 42, 109-118.
  5. Chen, W., Brouwers, H.J.H. and Shui, Z.H. (2007), "Three-dimensional computer modeling of slag cement hydration", J. Mater. Sci., 42(23), 9595-9610. https://doi.org/10.1007/s10853-007-1977-z
  6. Chen, W., Li, Y. and Shui, Z. (2011), "Percolation of phases in hydrating cement paste at early ages: an experimental and numerical study", The XIII International Congress on Cement Chemistry, Palomo, A., Zatagoza, A. and Agui, J.C.L. Madrid, Editado por el Instituto de Ciencias de la Construccion Eduardo Torroja, 6, 356.
  7. Feng, M. (1986), "Utilization of pulverized fly ashnext term in the People's Republic of China", Energy, 11(11-12), 1359-1362. https://doi.org/10.1016/0360-5442(86)90072-1
  8. Giergiczny, Z. (2006), "The hydraulic activity of high calcium fly ash", J. Therm. Anal. Calorim., 83(1), 227-232. https://doi.org/10.1007/s10973-005-6970-7
  9. Hu, C. and de Larrard, F. (1996), "The rheology of fresh high-performance concrete", Cement Concrete Res., 26(2), 283-294. https://doi.org/10.1016/0008-8846(95)00213-8
  10. Kiattikomol, K., Jaturapitakkul, C., Songpiriyakij, S. and Chutubtim, S. (2001), "A study of ground coarse fly ashes with different finenesses from various sources as pozzolanic materials", Cement Concrete Comp., 23(4-5), 335-343. https://doi.org/10.1016/S0958-9465(01)00016-6
  11. Narmluk, M. and Nawa, T. (2011), "Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures", Cement Concrete Res., 41(6), 579-589. https://doi.org/10.1016/j.cemconres.2011.02.005
  12. Paya, J., Monzo, J., Borrachero, M.V., Peris, E. and Gonzalez-Lopez, E. (1996), "Mechanical treatment of fly ashes part II: Particle morphologies in ground fly ashes (GFA) and workability of GFA-cement mortars", Cement Concrete Res., 26(2), 225-235. https://doi.org/10.1016/0008-8846(95)00212-X
  13. Paya, J., Monzo, J., Borrachero, M.V., Peris, E. and Gonzalez-Lopez, E. (1997), "Mechanical treatments of fly ashes. Part III: Studies on strength development of ground fly ashes (GFA) - Cement mortars", Cement Concrete Res., 27(9), 1365-1377. https://doi.org/10.1016/S0008-8846(97)00129-4
  14. Reinhardt, H.W. and Grosse, C.U. (2004), "Continuous monitoring of setting and hardening of mortar and concrete", Constr. Build. Mater., 18(3), 145-154. https://doi.org/10.1016/j.conbuildmat.2003.10.002
  15. Sakai, E., Masuda, K., Kakinuma, Y. and Aikawa, Y. (2009), "Effects of shape and packing density of powder particles on the fluidity of cement pastes with limestone powder", J. Adv. Concrete Tech., 7(3), 347-354. https://doi.org/10.3151/jact.7.347
  16. Struble, L.J. and Lei, W.G. (1995), "Rheological changes associated with setting of cement paste", Adv. Cement Based Mater., 2(6), 224-230. https://doi.org/10.1016/1065-7355(95)90041-1
  17. Tangpagasit, J., Cheerarot, R., Jaturapitakkul, C. and Kiattikomol, K. (2005), "Packing effect and pozzolanic reaction of fly ash in mortar", Cement Concrete Res., 35(6), 1145-1151. https://doi.org/10.1016/j.cemconres.2004.09.030
  18. Termkhajornkit, P. and Nawa, T. (2004), "The fluidity of fly ash-cement paste containing naphthalene sulfonate superplasticizer", Cement Concrete Res., 34(6), 1017-1024. https://doi.org/10.1016/j.cemconres.2003.11.017
  19. Uchikawa, H., Hanehara, S. and Sawaki, D. (1997), "The role of steric repulsive force in the dispersion of cement particles in fresh paste prepared with organic admixture", Cement Concrete Res., 27(1), 37-50. https://doi.org/10.1016/S0008-8846(96)00207-4
  20. Van Breugel, K. (1997), Simulation of hydration and formation of structure in hardening cement-based materials, Delft, The Netherlands, Delft University Press.
  21. Vikan, H., Justnes, H. and Figi, R. (2005), Adsorption of plasticizers - Influence of plasticizer and cement type, Nordic Rheology Conference 2005, Tampere, Finland.
  22. Wallevik, J.E. (2009), "Rheological properties of cement paste: Thixotropic behavior and structural breakdown", Cement Concrete Res., 39(1), 14-29. https://doi.org/10.1016/j.cemconres.2008.10.001
  23. Wang, A.Q., Zhang, C.Z. and Sun, W. (2003), "Fly ash effects: I. The morphological effect of fly ash", Cement Concrete Res., 33(12), 2023-2029. https://doi.org/10.1016/S0008-8846(03)00217-5
  24. Ye, G., Lura, P., van Breugel, K. and Fraaij, A.L.A. (2004), "Study on the development of the microstructure in cement-based materials by means of numerical simulation and ultrasonic pulse velocity measurement", Cement Concrete Comp., 26(5), 491-497. https://doi.org/10.1016/S0958-9465(03)00081-7