DOI QR코드

DOI QR Code

Effect of low-calcium fly ash on sulfate resistance of cement paste under different exposure conditions

  • Zhang, Wuman (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University) ;
  • Zhang, Yingchen (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University) ;
  • Gao, Longxin (Department of Civil Engineering, School of Transportation Science and Engineering, Beihang University)
  • 투고 : 2018.10.24
  • 심사 : 2019.03.17
  • 발행 : 2019.05.25

초록

Low-calcium fly ash (LCFA) were used to prepare cement/LCFA specimens in this study. The basic physical properties including water demand, fluidity, setting time, soundness and drying shrinkage of cement/LCFA paste were investigated. The effects of curing time, immersion time and wet-dry cycles in 3% $Na_2SO_4$ solution on the compressive strength and the microstructures of specimens were also discussed. The results show that LCFA increases the water demand, setting time, soundness of cement paste samples. 50% and 60% LCFA replacement ratio decrease the drying shrinkage of hardened cement paste. The compressive strength of plain cement specimens decreases at the later immersion stage in 3% $Na_2SO_4$ solution. The addition of LCFA can decrease this strength reduction of cement specimens. For all specimens with LCFA, the compressive strength increases with increasing immersion time. During the wet-dry cycles, the compressive strength of plain cement specimens decreases with increasing wet-dry cycles. However, the pores in the specimens with 30% and 40% LCFA at early ages could be large enough for the crystal of sodium sulfate, which leads to the compressive strength increase with the increase of wet-dry cycles in 3% $Na_2SO_4$ solution. The microstructures of cement/LCFA specimens are in good agreement with the compressive strength.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of P. R. China

참고문헌

  1. Berry, E.E., Hemmings, R.T. and Cornelius, B.J. (1990), "Mechanisms of hydration reactions in high volume fly ash pastes and mortars", Cement Concrete Compos., 12(4), 253-261 https://doi.org/10.1016/0958-9465(90)90004-H
  2. Brown, P.W. (2002), "Thaumasite formation and other forms of sulfate attack", Cement Concrete Compos., 24(3-4), 301-303. https://doi.org/10.1016/S0958-9465(01)00081-6
  3. Bui, P.T., Ogawa, Y., Nakarai, K. and Kawai, K. (2016), "Effect of internal alkali activation on pozzolanic reaction of low-calcium fly ash cement paste", Mater. Struct., 49, 3039-3053. https://doi.org/10.1617/s11527-015-0703-6
  4. Cabrera, J.G. and Plowman, C. (1988), "The mechanism and rate of attack of sodium sulphate solution on cement and cemenvpfa pastes", Adv. Concrete Res., 1(3), 171-179.
  5. Chindaprasirt, P., Homwuttiwong, S. and Sirivivatnanon, V. (2004), "Effectiveness of fly ash on the restrained shrinkage cracking resistance of self-compacting concrete", Cement Concrete Res., 34(17), 1087-1092. https://doi.org/10.1016/j.cemconres.2003.11.021
  6. Chindaprasirt, P., Jaturapitakkul, C. and Sinsiri, T. (2005), "Effect of fly ash fineness on compressive strength and pore size of blended cement paste", Cement Concrete Compos., 27(4), 425-428. https://doi.org/10.1016/j.cemconcomp.2004.07.003
  7. Djuric, M., Ranogajec, J., Omorjan, R. and Miletic, S. (1996), "Sulfate corrosion of portland cement-pure and blended with 30% of fly ash", Cement Concrete Res., 26(9), 1295-1300. https://doi.org/10.1016/0008-8846(96)00127-5
  8. Ghafoori, N., Najimi, M., Diawara, H. and Islam, M.S. (2015), "Effects of class F fly ash on sulfate resistance of Type V Portland cement concretes under continuous and interrupted sulfate exposures", Constr. Build. Mater., 78, 85-91. https://doi.org/10.1016/j.conbuildmat.2015.01.004
  9. Guerrero, A., Goni, S. and Allegro, V.R. (2009), "Resistance of class C fly ash belite cement to simulated sodium sulphate radioactive liquid waste attack", J. Hazard. Mater., 161(2-3), 1250-1254. https://doi.org/10.1016/j.jhazmat.2008.04.086
  10. Hanehara, S., Tomosawa, F., Kobayakawa, M. and Hwang, K. (2001), "Effects of water/powder ratio, mixing ratio of fly ash, and curing temperature on pozzolanic reaction of fly ash in cement paste", Cement Concrete Res., 31(1), 31-39. https://doi.org/10.1016/S0008-8846(00)00441-5
  11. Irassar, F. and Batic, O. (1989), "Effects of low calcium fly ash on sulfate resistance of OPC cement", Cement Concrete Res., 19(2), 194-202. https://doi.org/10.1016/0008-8846(89)90084-7
  12. Jena, T. and Panda, K.C. (2018), "Mechanical and durability properties of marine concrete using fly ash and silpozz", Adv. Concrete Constr., 6(1), 47-68. https://doi.org/10.12989/ACC.2018.6.1.047
  13. Jindal, B.B., Singhal, D., Sharma, S.K., Ashish, D.K. and Parveen. (2017), "Improving compressive strength of low calcium fly ash geopolymer concrete with alccofine", Adv. Concrete Constr., 5(1), 17-29. https://doi.org/10.12989/acc.2017.5.1.17
  14. Lam, L., Wong, Y.L. and Poon, C.S. (2000), "Degree of hydration and gel/space ratio of high-volume fly ash/cement systems", Cement Concrete Res., 30, 747-756. https://doi.org/10.1016/S0008-8846(00)00213-1
  15. Lee, C.Y., Lee, H.K. and Lee, K.M. (2003), "Strength and microstructural characteristics of chemically activated fly ashcement systems", Cement Concrete Res., 33, 425-431. https://doi.org/10.1016/S0008-8846(02)00973-0
  16. Malhotra, V.M. (1990), "Durability of concrete incorporating highvolume of low-calcium (ASTM Class F) fly ash", Cement Concrete Compos., 12(4), 271-277. https://doi.org/10.1016/0958-9465(90)90006-J
  17. Paliwal, G. and Maru, S. (2017), "Effect of fly ash and plastic waste on mechanical and durability properties of concrete", Adv. Concrete Constr., 5(6), 313-330.
  18. Papadakis, V.G. (1999), "Effect of fly ash on Portland cement systems: Part I. Low-calcium fly ash", Cement Concrete Res., 29(11), 1727-1736. https://doi.org/10.1016/S0008-8846(99)00153-2
  19. Poon, C.S., Lam, L. and Wong, Y.L. (2000), "A study on high strength concrete prepared with large volumes of low calcium fly ash", Cement Concrete Res., 30(3), 447-455. https://doi.org/10.1016/S0008-8846(99)00271-9
  20. Roy, D.M., Arjunan, P. and Silsbee, M.R. (2001), "Effect of silica fume, metakaolin, and low-calcium fly ash on chemical resistance of concrete", Cement Concrete Res., 31(12), 1809-1813. https://doi.org/10.1016/S0008-8846(01)00548-8
  21. Shane, D., Ana, F.J. and Palomo, A.A. (2013), "Very high volume fly ash cements early age hydration study using $Na_{2}SO_{4}$ as an activator", J. Am. Ceramic Soc., 96(3), 900-906. https://doi.org/10.1111/jace.12178
  22. Shi, M.X., Wang, Q. and Zhou, Z. (2015), "Comparison of the properties between high-volume fly ash concrete and highvolume steel slag concrete under temperature matching curing condition", Constr. Build. Mater., 98, 649-655. https://doi.org/10.1016/j.conbuildmat.2015.08.134
  23. Stark, D. (2002), "Performance of concrete in sulfate environments", PCA Research & Development Bulletin RD129, Portland Cement Association, Skokie, IL, 1-23.
  24. Supit, S.W.M., Shaikh, F.U.A. and Sarker, P.K. (2014), "Effect of ultrafine fly ash on mechanical properties of high volume fly ash mortar", Constr. Build. Mater., 51(31), 278-286 https://doi.org/10.1016/j.conbuildmat.2013.11.002
  25. Tertnkhajornkit, P.N., Nawa, T. and Nakai, M. (2005), "Effect of fly ash on autogenous shrinkage", Cement Concrete Res., 35(3), 473-482. https://doi.org/10.1016/j.cemconres.2004.07.010
  26. Tikalsky, P.J. and Carrasquillo, R.L. (1992), "Influence of fly ash on the sulfate resistance of concrete", ACI Mater. J., 89(1), 69-75.
  27. Torii, K., Taniguchi, K. and Kawamura, M. (1995), "Sulfate resistance of high fly ash content concrete", Cement Concrete Res., 25(4), 759-768. https://doi.org/10.1016/0008-8846(95)00066-L
  28. Wang, D.Z., Zhou, X.M., Meng, Y.F. and Chen, Z. (2017), "Durability of concrete containing fly ash and silica fume against combined freezing-thawing and sulfate attack", Constr. Build. Mater., 147, 398-406. https://doi.org/10.1016/j.conbuildmat.2017.04.172
  29. Wang, X.Y. and Lee, H.S. (2013), "Modeling of chloride diffusion in concrete containing low-calcium fly ash", Mater. Chem. Phys., 138(2-3), 917-928. https://doi.org/10.1016/j.matchemphys.2012.12.085
  30. Xiong, C.S., Jiang, L.H., Xu, Y., Song, Z.J., Chu, H.Q. and Guo, Q.X. (2016), "Influences of exposure condition and sulfate salt type on deterioration of paste with and without fly ash", Constr. Build. Mater., 113, 951-963. https://doi.org/10.1016/j.conbuildmat.2016.03.154
  31. Zhang, W.M., Ba, H.J. and Chen, S.J. (2011), "Effect of fly ash and repeated loading on diffusion coefficient in chloride migration test", Constr. Build. Mater., 25(5), 2269-2274. https://doi.org/10.1016/j.conbuildmat.2010.11.016
  32. Zhang, Y.M., Sun, W. and Shang, L.F. (1997), "Mechanical properties of high performance concrete made with high calcium high sulfate fly ash", Cement Concrete Res., 27(7), 1093-1098. https://doi.org/10.1016/S0008-8846(97)00087-2

피인용 문헌

  1. Effect of sulfate activators on mechanical property of high replacement low-calcium ultrafine fly ash blended cement paste vol.11, pp.3, 2019, https://doi.org/10.12989/acc.2021.11.3.183