• Dr. Faiz Uddin Ahmed Shaikh
  • Dr. Faiz Uddin Ahmed Shaikh
  • Curtin University of Australia, Australia
  • Title: Role of nano particles on durability of sustainable high volume fly ash concrete
  • Abstract:
    The manufacturing of cement is blamed to contribute between 5 and 7% of total CO2 emission into atmosphere worldwide. The building materials sector is the third largest CO2 emitting industry in the world. Countries across the globe under the umbrella of intergovernmental panel on climate change (IPCC) have recently come to a consensus on reducing the greenhouse gases and in particular CO2 emission. Therefore, it is utmost important for construction industry to reduce the consumption of cement in concrete and cement based construction materials. On the other hand, to meet the power demands, coal-burning power stations worldwide have been producing colossal quantities of fly ash as a by-product. Most of them are sent for land filling which cause air and underground water pollutions. The presence of high silica and alumina contents make it a suitable pozzolanic material for concrete, which contributes to the improvement of properties of concrete. This paper presents experimental results on chloride induced corrosion and related durability properties such as chloride permeability, water sorptivity, chloride diffusion and porosity of ordinary concrete and high volume fly ash (HVFA) concretes containing nano silica (NS) and nano calcium carbonate (NC) particles as partial replacement of cement. The NS and NC are used as 2% and 1%, respectively by wt. of cement in the above concretes. Results show that the addition of NS and NC significantly improved the corrosion resistance of ordinary concrete and HVFA concretes in terms of lower corrosion currents, lower steel loss and longer time require creating corrosion induced crack. Sorptivity, chloride diffusivity and chloride permeability of above concretes also reduced significantly due to the addition of NS and NC, which correlate well with the corrosion tests. The addition of NS and NC also significantly reduced the capillary pores and gel pores of above concretes and also shifted the pore concentration towards the medium capillary pores. Thermo gravimetric analysis (TGA) and differential thermal analysis (DTA) analysis of above concretes also confirms the reduction of calcium hydroxide (CH) in the concretes containing nano particles, thus the formation of additional calcium-silicate-hydrate (CSH) gel in the system.
  • Biography:
    Dr. Faiz Uddin Ahmed Shaikh received his Ph.D. degree in structural engineering from the National University of Singapore in 2004. He is currently Senior Lecturer in department of civil engineering of Curtin University of Australia, where he is leading research on use of various nano and ultrafine pozzolanic materials in sustainability of concrete. His other research interests are on the development of geopolymer based highly ductile fibre composite and its structural applications, use of supplementary cementitious materials, recycled aggregates and other industrial bi-products in concrete, natural fibre reinforced building materials and development of fire resistant geopolymeric coating for timber, steel and reinforced concrete. He has published more than 100 peer-reviewed international journal and conference papers and 4 book chapters. He is also recipient of invited research fellowship and post-doctoral research fellowship by the Japan society for the promotion of science in 2005 and 2014, respectively. He is currently in the editorial board of a number of international journals and served as technical committee member of a number of international conferences.
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Important Dates
October 23-25, 2015
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July 8, 2015  >> September 9, 2015
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