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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives
Author(s): R. Roychand, S. De Silva, D. Law, and S. Setunge
Appears on pages(s): 113–124
Keywords: nano silica, silica fume, fly ash, additives, X-ray diffraction, scanning electron microscopy
Abstract:This paper presents the effect of silica fume and nano silica, used individually and in combination with the setaccelerator 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 scanningelectron microscopy were undertaken to study the effect of various elements on the physico-chemical behaviour of the blendedcomposites. The results show that silica fume when used in combination with the set accelerator and hydrated lime in HV-UFFAcement mortar, improves its 7 and 28 day strength by 273 and 413 %, respectively, compared to the binary blended cement fly ashmortar. On the contrary, when nano silica is used in combination with set accelerator and hydrated lime in HV-UFFA cementmortar, the disjoining pressure in conjunction with the self-desiccation effect induces high early age micro cracking, resulting inhindering the development of compressive strength. However, when nano silica is used without the additives, it improves the 7 and28 day strengths of HV-UFFA cement mortar by 918 and 567 %, respectively and the compressive strengths are comparable to thatof OPC.
IJCSM, International Partner Access.
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