International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives

  • Roychand, R. (School of Civil, Environmental and Chemical Engineering, RMIT University) ;
  • De Silva, S. (School of Civil, Environmental and Chemical Engineering, RMIT University) ;
  • Law, D. (School of Civil, Environmental and Chemical Engineering, RMIT University) ;
  • Setunge, S. (School of Civil, Environmental and Chemical Engineering, RMIT University)
  • Received : 2015.07.14
  • Accepted : 2015.12.20
  • Published : 2016.03.30
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Abstract

This paper presents the effect of silica fume and nano silica, used individually and in combination with the set accelerator and/or hydrated lime, on the properties of class F high volume ultra fine fly ash (HV-UFFA) cement composites, replacing 80 % of cement (OPC). Compressive strength test along with thermogravimetric analysis, X-ray diffraction and scanning electron microscopy were undertaken to study the effect of various elements on the physico-chemical behaviour of the blended composites. The results show that silica fume when used in combination with the set accelerator and hydrated lime in HV-UFFA cement mortar, improves its 7 and 28 day strength by 273 and 413 %, respectively, compared to the binary blended cement fly ash mortar. On the contrary, when nano silica is used in combination with set accelerator and hydrated lime in HV-UFFA cement mortar, the disjoining pressure in conjunction with the self-desiccation effect induces high early age micro cracking, resulting in hindering the development of compressive strength. However, when nano silica is used without the additives, it improves the 7 and 28 day strengths of HV-UFFA cement mortar by 918 and 567 %, respectively and the compressive strengths are comparable to that of OPC.

Keywords

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