Materials and Structures

, Volume 46, Issue 1–2, pp 135–143 | Cite as

The influence of different preparation methods on the aggregation status of pyrogenic nanosilicas used in concrete

  • A. Bagheri
  • T. Parhizkar
  • H. Madani
  • A. M. Raisghasemi
Original Article


Investigation of the effects of nanosilica materials in cementitious mixtures has attracted considerable research attention due to the very high specific surfaces of these materials. However, high surface area leads to aggregation of these materials due to high surface attraction forces, which could seriously reduce their nano filler effect. In this research the dispersion of pyrogenic nanosilicas in water and parameters influencing it were investigated. The results show that serious aggregation of pyrogenic nanosilicas in water occurs. Increasing the amount of applied forces, particularly the use of ultrasonic waves, has considerable effect in breaking aggregates into smaller aggregates with maximum size up to 0.9 μm. Increasing the pH was found to be very effective in improving dispersion of nanosilicas and through combined use of high pH and applying high levels of energy such as ultrasonic method it is possible to break all the aggregates into primary aggregates with maximum size of about 0.06 μm.


Pyrogenic nanosilica Particle size distribution Aggregation Energy pH 



Support from the building and housing research center (bhrc) is gratefully acknowledged. Authors also express their gratitude to Dr. Razavian and Mrs. Pozhhan for performing particle size distribution analyses.


  1. 1.
    ACI Committee 234 (2006) Guide for the use of silica fume in concrete. American Concrete InstituteGoogle Scholar
  2. 2.
    Amiri A, Øye G, Sjöblem J (2009) Influence of pH, high salinity and particle concentration on stability and rheological properties of aqueous suspensions of fumed silica. Colloid Interfaces A: Physicochem Eng Asp 349:43–54CrossRefGoogle Scholar
  3. 3.
    Brinkmann U, Ettlinger M, Kerner D, Schmoll R (2006) Synthetic Amorphous Silica. In: Bergna HE, Roberts WO (eds) Colloidal Silica, Fundamentals and applications. Taylor and Francis group, pp 575–588Google Scholar
  4. 4.
    Diamond S, Sahu S (2006) Densified silica fume: particle size and dispersion in concrete. Mater Struct 39:849–859CrossRefGoogle Scholar
  5. 5.
    Jenkins S, Kirk SR, Persson M, Carlen J, Abbas Z (2009) The role of hydrogen bonding in nanocolloidal amorphous silica particles in electrolyte solutions. J Colloid Interface Sci 339:351–361CrossRefGoogle Scholar
  6. 6.
    Ji H (2005) Preliminary study on water permeability and microstructure of concrete incorporating nano-SiO 2. Cem Concr Res 35:1943–1947CrossRefGoogle Scholar
  7. 7.
    Jo BW, Kim CH, Lim JH (2007) Characteristics of cement mortar with nano SiO2 particles. ACI Mater J 104:404–407Google Scholar
  8. 8.
    Jo BW, Kim CH, TaoGH Park JB (2007) Characteristics of cement mortar with nano-SiO2 particles. Constr Build Mater 21:1351–1355CrossRefGoogle Scholar
  9. 9.
    Korpa A, Trettin R, Bottger KG, Thieme J, Schmidt C (2008) Pozzolanic reactivity of nanoscale pyrogene oxides and their strength contribution in cement-based systems. Adv Cem Res 20:35–46CrossRefGoogle Scholar
  10. 10.
    Korpa A, Kowald T, Trettin R (2008) Hydration behaviour, structure and morphology of hydration phases in advanced cement-based systems containing micro and nanoscale pozzolanic additives. Cem Concr Res 28:955–962CrossRefGoogle Scholar
  11. 11.
    Li H, Xiao HG, Ou J (2004) A study on mechanical and pressure-sensitive properties of cement mortar with nanophase materials. Cem Concr Res 34:435–438CrossRefGoogle Scholar
  12. 12.
    Li H, Xiao HG, Yuan J, OU J (2004) Microstructure of cement mortar with nano-particles. Composites B 35:185–189CrossRefGoogle Scholar
  13. 13.
    Li H, Xiao HG, Ou J (2007) Flexural fatique performance of concrete containing nano-particles for pavement. Int J Fatig 29:1292–1301CrossRefGoogle Scholar
  14. 14.
    Mitchelle DRG, Hinczak I, Day RA (1998) Interaction of silica fume with calcium hydroxide solutions. Cem Concr Res 28:1571–1584CrossRefGoogle Scholar
  15. 15.
    Naji Givi A, Abdul Rashid S, Aziz FNA, Mohd Salleh MA (2012) Experimental investigation of the size effects of SiO2 nano-particles on the mechanical properties of binary blended concrete. Composites B 41:673–677CrossRefGoogle Scholar
  16. 16.
    Porro A, Dolado JS, Campillo I, Erkizia E, Miguel Y de, Ibara YSaezde, Ayuela A (2005) Effect of nanosilica additions on cement pastes. In: Applications of nanotechnology in concrete design, Dundee, pp 87–96Google Scholar
  17. 17.
    Qing Y, Zenan Z, Deyn K, Rongshen C (2007) Influence of nano- addition on properties of hardened cement paste as compared with silica fume. Constr Build Mater 21:539–545CrossRefGoogle Scholar
  18. 18.
    Rahaman MN (2003) Ceramic processing and sintering, 2nd edn. Marcell Dekker, New YorkGoogle Scholar
  19. 19.
    Roberts WO (2006) Manufacturing and applications of water-borne colloidal silica. In: Bergna HE, Roberts WO (eds) Colloidal silica, fundamentals and applications. Taylor and Francis group, Boca Raton, pp 131–176Google Scholar
  20. 20.
    Sauter C, Emin MA, Schuchmann HP, Tavman S (2008) Influence of hydrostatic pressure and sound amplitude on the ultrasound induced dispersion and de-agglomeration of nanoparticles. Ultrason Sonochem 15:517–523CrossRefGoogle Scholar
  21. 21.
    Wolsiefer J (2002) The measurement and analysis of silica-fume particle size distribution and de-agglomeration of different silica fume product forms. In: Proceeding of 5th international CANMET-ACI conference on durability of concrete, Barcelona, ACI SP242, pp 111–130Google Scholar
  22. 22.
    Zhuravlev LT (2000) The surface chemistry of amorphous silica. Zhuravlev model. Colloids Surf A: Physicochem Eng Asp 173:1–38CrossRefGoogle Scholar

Copyright information

© RILEM 2012

Authors and Affiliations

  • A. Bagheri
    • 1
  • T. Parhizkar
    • 2
  • H. Madani
    • 1
  • A. M. Raisghasemi
    • 2
  1. 1.Department of Civil EngineeringK.N.Toosi University of TechnologyTehranIran
  2. 2.Building and Housing Research CenterTehranIran

Personalised recommendations