Computers and Concrete

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Effect of fineness of high lime fly ash on pozzolanic reactivity and ASR mitigation

  • Afshinnia, Kaveh (Glenn Department of Civil Engineering, Clemson University) ;
  • Rangaraju, Prasada R. (Glenn Department of Civil Engineering, Clemson University)
  • Received : 2016.03.21
  • Accepted : 2017.04.12
  • Published : 2017.08.25
⟨ Previous Next ⟩

Abstract

Typically, high lime fly ash (Class C) has been characterized as a fly ash, which at lower replacement levels is not as effective as the low lime (Class F) fly ash, in mitigating alkali-silica reaction (ASR) in portland cement concrete. The influence of fineness of Class C, obtained by grinding virgin fly ash into finer particles, on its pozzolanic reactivity and ASR mitigation performance was investigated in this study. In order to assess the pozzolanic reactivity of mortar mixtures containing virgin or ground fly ashes, the strength activity index (SAI) test and thermo-gravimetric analysis (TGA) were conducted on the mortar cubes and paste samples, respectively, containing virgin fly ash or two ground fly ashes. In addition, to evaluate any improvement in the ASR mitigation of ground fly ashes compared to that of the virgin fly ash, the accelerated mortar bar test (AMBT) was conducted on the mortar mixtures containing different dosages of either virgin or ground fly ashes. In all tests crushed glass aggregate was used as a highly reactive aggregate. Results from this study showed that the finest fly ash (i.e., with an average particle size of 3.1 microns) could increase the flow ability along with the pozzolanic reactivity of the mortar mixture. However, results from this study suggested that the fineness of high lime fly ash does not seem to have any significant effect on ASR mitigation.

Keywords

References

  1. Afshinnia, K. and Rangaraju, P.R. (2015), "Influence of fineness of ground recycled glass on mitigation of alkali-silica reaction in mortars", Constr. Build. Mater., 81, 257-267. https://doi.org/10.1016/j.conbuildmat.2015.02.041
  2. Afshinnia, K. and Rangaraju, P.R. (2015), "Efficiency of ternary blends containing fine glass powder in mitigating alkali-silica reaction", Constr. Build. Mater., 100, 234-245. https://doi.org/10.1016/j.conbuildmat.2015.09.043
  3. Aydin, S., Karatay, C. and Baradan, B. (2010), "The effect of grinding process on mechanical properties and alkali-silica reaction resistance of fly ash incorporated cement mortars", Pow. Technol., 197(1), 68-72. https://doi.org/10.1016/j.powtec.2009.08.020
  4. 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 Comp., 27(4), 425-428. https://doi.org/10.1016/j.cemconcomp.2004.07.003
  5. Du, L., Lukefahr, E. and Naranjo, A. (2012), "Texas department of transportation fly ash database and the development of chemical composition-based fly ash alkali-silica reaction durability index", J. Mater. Civil Eng., 25(1), 70-77.
  6. Folliard, K., Kruse, K., Jasso, A., Ferron, R. and Juenger, M. (2012), Characterizing Class C Fly Ashes for Alkali Silica Reaction Mitigation Effectiveness, Transport Research Board (TRB) Annnual Meeting, Washington, U.S.A.
  7. Gebler, S.H. and Klieger, P. (1986), "Effect of fly ash on physical properties of concrete", ACI Spec. Publ., 91.
  8. Helmuth, R. (1987), Fly Ash in Cement and Concrete, Portland Cement Association, SP040.01T, 193.
  9. Harish, K.V. and Rangaraju, P.R. (2011), "Effect of blended fly ashes in mitigating alkali-silica reaction", Transp. Res. Rec., 2240, 80-88. https://doi.org/10.3141/2240-11
  10. Nie, Q., Zhou, C., Li, H., Shu, X., Gong, H. and Huang, B. (2015), "Numerical simulation of fly ash concrete under sulfate attack", Constr. Build. Mater., 84, 261-268. https://doi.org/10.1016/j.conbuildmat.2015.02.088
  11. Roskos, C., Berry, M. and Stephens, J. (2012), Evaluation of Fly Ash Based Concretes Containing Glass Aggregates for Use in Transportation Applications, Transport Research Board (TRB) Annual Meeting, Washington, U.S.A.
  12. Shafaatian, S.M., Akhavan, A., Maraghechi, H. and Rajabipour, F. (2013), "How does fly ash mitigate alkali-silica reaction (ASR) in accelerated mortar bar test (ASTM C1567)?" Cement Concrete Comp., 37, 143-153. https://doi.org/10.1016/j.cemconcomp.2012.11.004
  13. Shaikh, F.U. and Supit, S.W. (2015), "Compressive strength and durability properties of high volume fly ash (HVFA) concretes containing ultrafine fly ash (UFFA)", Constr. Build. Mater., 82, 192-205. https://doi.org/10.1016/j.conbuildmat.2015.02.068
  14. Shehata, M.H., Thomas, M.D. and Bleszynski, R.F. (1999), "The effects of fly ash composition on the chemistry of pore solution in hydrated cement pastes", Cement Concrete Res., 29(12), 1915-1920. https://doi.org/10.1016/S0008-8846(99)00190-8
  15. Shehata, M.H. and Thomas, M.D. (2000), "The effect of fly ash composition on the expansion of concrete due to alkali-silica reaction", Cement Concrete Res., 30(7), 1063-1072. https://doi.org/10.1016/S0008-8846(00)00283-0
  16. Shon, C.S., Sarkar, S.L. and Zollinger, D.G. (2004), "Testing the effectiveness of class C and class F fly ash in controlling expansion due to alkali-silica reaction using modified ASTM C 1260 test method", J. Mater. Civil Eng., 16(1), 20-27. https://doi.org/10.1061/(ASCE)0899-1561(2004)16:1(20)
  17. Simcic, T., Pejovnik, S., De Schutter, G. and Bosiljkov, V.B. (2015), "Chloride ion penetration into fly ash modified concrete during wetting-drying cycles", Constr. Build. Mater., 93, 1216-1223. https://doi.org/10.1016/j.conbuildmat.2015.04.033
  18. Sumer, M. (2012), "Compressive strength and sulfate resistance properties of concretes containing class F and class C fly ashes", Constr. Build. Mater., 34, 531-536. https://doi.org/10.1016/j.conbuildmat.2012.02.023
  19. Thomas, M., Dunster, A., Nixon, P. and Blackwell, B. (2011), "Effect of fly ash on the expansion of concrete due to alkalisilica reaction-exposure site studies", Cement Concrete Comp., 33(3), 359-367. https://doi.org/10.1016/j.cemconcomp.2010.11.006
  20. Uysal, M. and Akyuncu, V. (2012), "Durability performance of concrete incorporating class F and class C fly ashes", Constr. Build. Mater., 34, 170-178. https://doi.org/10.1016/j.conbuildmat.2012.02.075
  21. Venkatanarayanan, H.K. and Rangaraju, P.R. (2013), "Decoupling the effects of chemical composition and fineness of fly ash in mitigating alkali-silica reaction", Cement Concrete Comp., 43, 54-68. https://doi.org/10.1016/j.cemconcomp.2013.06.009
  22. Yoo, S.W., Ryu, G.S. and Choo, J.F. (2015), "Evaluation of the effects of high-volume fly ash on the flexural behavior of reinforced concrete beams", Constr. Build. Mater., 93, 1132-1144. https://doi.org/10.1016/j.conbuildmat.2015.05.021