Pusat Pengajian Perumahan, Bangunan & Perancangan - Tesis

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Browsing Pusat Pengajian Perumahan, Bangunan & Perancangan - Tesis by Subject "Alkali-Activated Iron"

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    Properties Of Alkali-Activated Iron Slag And Coal Fly Ash Concrete Containing Synthesized Ferro-Alloy Fume Silicate And Lime Kiln Dust
    (2022-12)
    Tan, Leng Ee
    Production of Ordinary Portland Cement (OPC) brought high carbon footprint. Industrial by-products such as Pulverised Fuel Ash (PFA) and Ground Granulated Blast Furnace Slag (GGBS) were widely used to replace OPC to overcome this environmental problem. However, PFA and GGBS were slow in strength development. Adding an alkali activator such as strong hydroxide could boost the hardening process, but the safe handling of the highly corrosive materials is the primary concern. Additionally, the production of synthetic alkali activators like commercial sodium silicate yields high carbon dioxide (CO2) emissions. This process involves melting the sand under elevated temperatures and mixing the melted sand with concentrated sodium hydroxide which is highly energy intensive. Therefore, this research aims to develop alkali activators that are safer to handle and develop a lower embodied energy process to produce sodium silicate for use as alkali-activator in alkali-activated material (AAM). In the first stage of research, various types of gypsum were used to activate PFA/GGBS mortar. The second stage involved the activation and partial replacement of the PFA/GGBS binder phase. The following research step synthesises sodium silicate from silica fume and sodium hydroxide with various synthesis methods. The resulting silica fume-sodium silicate was combined with Lime Kiln Dust (LKD) to activate the PFA/GGBS binder. The effectiveness of the resulting sodium silicate for use as an alkali activator was evaluated. In the final stage, the most effective silica fume-sodium silicate activates the LKD activated PFA/GGBS blended concrete in various amounts.