Advances in concrete construction

  • 제6권2호
  • /
  • Pages.123-143
  • /
  • 2018
  • /
  • 2287-5301(pISSN)
  • /
  • 2287-531X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Investigating the use of wollastonite micro fiber in yielding SCC

  • Sharma, Shashi Kant (Civil Engineering Department, NIT Jalandhar) ;
  • Ransinchung, G.D. (Civil Engineering Department, Indian Institute of Technology Roorkee) ;
  • Kumar, Praveen (Civil Engineering Department, Indian Institute of Technology Roorkee)
  • 투고 : 2017.03.17
  • 심사 : 2018.02.27
  • 발행 : 2018.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

Self compacting concrete (SCC) has good flowability, passability and segregation resistance because of voluminous cementitious material & high coarse aggregate to fine aggregate ratio, and high free water availability. But these factors make it highly susceptible to shrinkage. Fibers are known to reduce shrinkage in concrete mixes. Until now for conserving cement, only pozzolanic materials are admixed in concrete to yield a SCC. Hence, this study compares the use of wollastonite micro fiber (WMF), a cheap pozzolanic easily processed raw mineral fiber, and flyash in yielding economical SCC for rigid pavement. Microsilica was used as a complimentary material with both admixtures. Since WMF has large surface area ($827m^2/kg$), is acicular in nature; therefore its use in yielding SCC was dubious. Binary and ternary mixes were constituted for WMF and flyash, respectively. Paste mixes were tested for compatibility with superplasticizer and trials were performed on a normal concrete mix of flexural strength 4.5 MPa to yield SCC. Flexural strength test and restrained shrinkage test were performed on those mixes, which qualified self compacting criteria. Results revealed that WMF admixed pastes have high water demand, and comparable setting times to flyash mixes. Workability tests showed that 20% WMF with microsilica (5-7.5%) is efficient enough in achieving SCC and higher flexural strength than normal concrete at 90 days. Also, stress rate due to shrinkage was lesser and time duration for final strain was higher in WMF admixed SCC which encourages its use in yielding a SCC than pozzolanic materials.

키워드

참고문헌

  1. Ahmad, S., Umar, A. and Masood, A. (2017), "Properties of normal concrete, self compacting concrete and glass fibre reinforced self compacting concrete: An experimental study", Procedia Eng., 173, 807-813. https://doi.org/10.1016/j.proeng.2016.12.106
  2. Altoubat, S., Junaid, M.T., Leblouba, M. and Badran, D. (2017), "Effectiveness of fly ash on the restrained shrinkage cracking resistance of self-compacting concrete", Cement Concrete Compos., 79, 9-20. https://doi.org/10.1016/j.cemconcomp.2017.01.010
  3. ASTM 618 (1985), Standard Specifications for Fly Ash and Raw or Calcined Natural Pozzolan for Use as Mineral Admixture in PCC, ASTM International, West Conshohocken, PA, USA.
  4. ASTM D 6910 (2009), Standard Test Method for Marsh Funnel Viscosity of Clay Construction Slurries, ASTM International, West Conshohocken, PA, USA.
  5. Bouzoubaa, N. and Lachemi, M. (2001), "Self-compacting concrete incorporating high volumes of Class F fly ash preliminary results", Cement Concrete Res., 31, 413-420. https://doi.org/10.1016/S0008-8846(00)00504-4
  6. CUR Report 144 (1991), "Fly ash as addition to concrete", Centre for Civil Engineering Research and Codes, Report 144, Netherlands, 99.
  7. Drazan, J. and Zelic, J. (2006), "The effect of fly ash on cement hydration in aqueous suspensions", Ceram. Silik., 50(2), 98-105.
  8. EFNARC (2005), "The European guidelines for self-compacting concrete: Specification, production and use", http://www.efca.info.
  9. Fathi, H., Lameie, T., Maleki, M. and Yazdani, R. (2017), "Simultaneous effects of fiber and glass on the mechanical properties of self-compacting concrete", Constr. Build. Mater., 133, 443-449. https://doi.org/10.1016/j.conbuildmat.2016.12.097
  10. FIP Commission on Concrete (1998), Condensed Microsilica in Concrete, State of the Art Report, Thomas Telford, London, 37.
  11. Grunewald, S. and Walraven, J.C. (2001), "Rheological study on the workability of fiber reinforced mortar", Proceedings of the Second International Symposium on Self Compacting Concrete, Tokyo, Japan.
  12. Hossain, K.M.A., Lachemi, M., Sammour, M. and Sonebi, M. (2012) "Influence of polyvinyl alcohol, steel and hybrid fibers on fresh and rheological properties of self-consolidating concrete", J. Mater. Civil Eng., ASCE, 24(9), 1211-1220. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000490
  13. IRC 44 (2008), "Tentative guidelines for cement concrete mix design for pavements", Indian Roads Congress, New Delhi, India.
  14. IS 12803 (1989), Methods of Analysis of Hydraulic Cement by X-Ray Fluorescence Spectrometer, Bureau of Indian Standards, New Delhi, India.
  15. IS 383 (1970), Indian Standard Methods of Tests for Gradation of Coarse Aggregates, Bureau of Indian Standards, New Delhi, India.
  16. IS 4031 IV (1988), Determination of Consistency of Standard Cement Paste: Methods of Physical Tests for Hydraulic Cement, Bureau of Indian Standards, New Delhi, India.
  17. IS 4031 V (1988), Methods of Physical Tests for Hydraulic Cement: Determination of Initial and Final Setting Times, Bureau of Indian Standards, New Delhi, India.
  18. IS 516 (1959), Indian Standard Methods of Tests for Strength of Concrete, Bureau of Indian Standards, New Delhi, India.
  19. IS 8112 (2013), Ordinary Portland Cement 43 Grade Specification, Bureau of Indian Standards, New Delhi, India.
  20. Jalal, M., Pouladkhan, A., Harandi, O.F. and Jafari, D. (2015), "Comparative study on effects of Class F fly ash, nano silica and silica fume on properties of high performance self compacting concrete", Constr. Build. Mater., 94, 90-104. https://doi.org/10.1016/j.conbuildmat.2015.07.001
  21. Khayat, H.K. and Aitcin, P.C. (1992), "Microsilica in concrete- An overview. Flyash, Microsilica, Slag and Natural Pozzolans in Concrete", ACI SP-132, Detroit, Michigan, 2, 835-72.
  22. Kostrzanowska-Siedlarz, A. and Golaszewski, J. (2016), "Rheological properties of high performance selfcompacting concrete: effects of composition and time", Constr. Build. Mater., 115, 705-715. https://doi.org/10.1016/j.conbuildmat.2016.04.027
  23. Langan, B.W., Weng, K. and Ward, M.A. (2002), "Effect of microsilica and fly ash on heat of hydration of Portland cement", Cement Concrete Res., 32(7), 1045-1051. https://doi.org/10.1016/S0008-8846(02)00742-1
  24. Lomboy, G., Wang, K. and Ouyang, C. (2011), "Shrinkage and fracture properties of semiflowable selfconsolidating concrete", J. Mater. Civil Eng., 23(11), 1514-1524. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000249
  25. Low, N.M.P. and Beaudoin, J.J. (1992), "Mechanical properties of high performance cement binders reinforced with wollastonite micro-fibers", Cement Concrete Res., 22(5), 981-989. https://doi.org/10.1016/0008-8846(92)90122-C
  26. Low, N.M.P. and Beaudoin, J.J. (1993), "The effect of wollastonite micro-fibre aspect ratio on reinforcement of Portland cement-based binders", Cement Concrete Res., 23, 1467-1479. https://doi.org/10.1016/0008-8846(93)90083-L
  27. Ransinchung, G.D. and Kumar, B. (2010), "Investigations on pastes and mortars of ordinary portland cement admixed with Wollastonite and Microsilica", J. Mater. Civ. Eng., ASCE, 22(4), 305-313. https://doi.org/10.1061/(ASCE)MT.1943-5533.0000019

피인용 문헌

  1. Optimized AI controller for reinforced concrete frame structures under earthquake excitation vol.11, pp.1, 2021, https://doi.org/10.12989/acc.2021.11.1.001