Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Investigation of Flexural Toughness Development of Steel Fiber Reinforced Concrete at Early Ages

강섬유 보강 콘크리트의 조기 재령에서의 휨 인성 발현에 관한 연구

  • 이창준 (한국건설기술연구원) ;
  • 신성우 (부경대학교 공과대학 안전공학부)
  • Published : 2009.12.31
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Abstract

Since the mechanical properties of cement-based materials are time-dependent due to the prolonged cement hydration process, those of fiber reinforced concrete(FRC) may also be time-dependent. Toughness is one of important properties of FRC. Therefore, it should be investigated toughness development of FRCs with curing ages to fully understand the time-dependent characteristics of FRCs. To this end, the effect of curing ages on flexural toughness development of steel fiber reinforced concrete is studied. Three point bending test with notched beam specimen was adapted for this study. Hooked-end steel fiber(DRAMIX 40/30) was used as a fiber ingredient to investigate w/c ratio and fiber volume fraction effect on toughness development during curing. Three different water-cement ratios(0.44, 0.5 and 0.6) and fiber volume fractions(0%, 0.5% and 1%) were used as influence factors. Each mixture specimens were tested at five different ages, 0.5, 1, 3, 7 and 28 days. The study shows that flexure toughness development with age is quite different than other concrete material properties such as compressive strength. The study also shows that the toughness development trend correlates more closely to water/cement ratio than to fiber volume fraction.

Keywords

References

  1. Bentur, A. and Mindess, S., Fiber Reinforced Cementitious Composites (2nd edition), Taylor and Francis, 2007
  2. Nataraja, M.C., Dhang, N., and Gupta, A.P., 'Toughness Characterization of Steel Fiber-Reinforced Concrete by JSCE Approach', Cement and Concrete Research, Vol. 30, pp. 593-597, 2000 https://doi.org/10.1016/S0008-8846(00)00212-X
  3. Gopalaratnam, V. S., Shah, S. P., Batson, G., Criswell, M., Ramakishnan, V., and Wecharatana, M., 'Fracture Toughness of Fiber Reinforced Concrete', ACI Materials Journal, Vol. 88, No. 4, pp. 339-353, 1991
  4. Balaguru, P., Narahari, R., and Patel, M., 'Flexural Toughness of Steel Fiber Reinforced Concrete', ACI Materials Journal, Vol. 89, No. 6, pp. 541-546, 1992
  5. Song, P.S. and Hwang, S., 'Mechanical Properties of High-strength Steel Fiber-reinforced Concrete', Construction and Building Materials, Vol. 18, pp. 669-673, 2004 https://doi.org/10.1016/j.conbuildmat.2004.04.027
  6. Chan, Y.W. and Li, V.C., 'Age Effect on the Characteristics of Fiber/Cement Interfacial Properties', Journal of Material Science, Vol. 32, pp. 5287-5289, 1997 https://doi.org/10.1023/A:1018658626152
  7. American Society for Testing and Materials (ASTM), 'Standard Test Method for Flexure Toughness and First-Crack Strength of Fiber-Reinforced Concrete (Using Beam With Third-Point Loading)', 2000 Book of ASTM Standards 04.02, pp. 528-535, 2000
  8. Gopalaratnam, V.S., Shah, S.P., Batson, G.B., Criswell, M.E., Ramakrishnan, V., and Wecharatana, M., “Fracture Toughness of Fiber Reinforced Concrete”, ACI Materials Journal, Vol. 88, No. 4, pp. 339-353, 1991
  9. Gopalaratnam, V.S. and Gettu, R., 'On the characterization of Flexural Toughness in Fiber Reinforced Concretes', Cement and Concrete Composites, Vol. 17, pp. 239-254, 1995 https://doi.org/10.1016/0958-9465(95)99506-O