School of Environmental Technology (SET)

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School of Environmental Technology (SET)

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    Effect of Alkali-Activation on Setting Characteristics of Binary and Ternary Blended Geopolymer Mortar
    (AL FARABI 4TH International congresson applied science,Erzurum Turkey, 2022-09-12) Nmadu Helen Gogo, Ogunbode E.B, Yusuf I.O, Hassan K.M
    To achieve sustainability, efforts have been made to eliminate the problem connected with cement usage and production by completely replacing cement with an environmentally benign binder. This study investigates the impact of alkali activation on the setting properties of three precursors (Metakaolin, Cassava Peel Ash, and Rice Husk Ash) combined for binary and ternary geopolymer mortar. The fresh properties of geopolymer mortars, including flowability, setting time, and strength, were studied. For each test, a binary mortar mix ratio of CPA/MK, MK/RHA, and CPA/RHA, such as 100/0, 0/100, 75/25, 50/50, and 25/75, was assessed, as well as a ternary mortar mix ratio of MK/CPA/RHA, such as 100/100/100, 50/25/25, 25/50/25, and 25/25/50, and 100 percent PC (Control). As activators for geopolymer mortar mixture, 6M, 9M, and 12M concentrations of Na2SiO3/NaOH solutions were utilized. The results demonstrated that the control mortar containing 100 percent PC flowed less than the binary and ternary mortars. Mixtures with a greater proportion of CPA cure faster than those containing a greater proportion of MK or RHA. In addition, the water-to-binder absorption rate of RHA is greater than that of MK and CPA. On the basis of its soundness features, the 100 percent PC (control) exhibits less expansion than the binary and ternary blended geopolymer mixtures. As an environmentally friendly building material, geopolymer mortar has shown great feasibility and application potential, according to the current study.
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    Evaluation of Shear Bond Strength of Geopolymer Mortar Containing Cassava Peel Ash and Metakaolin
    (School of environmental Technology (SETIC 2020) International conference, 2021-05-03) Wuna, M.A, Nmadu Helen Gogo, Ogunbode, E.B, Mohoro, I.S.
    The cement industry has been recorded to have contributed immensely to the high global carbon dioxide emissions the word is contesting with today. This has made researchers to looked for other sustainable substitutes. One of the possibility substitutes is geopolymer mortar, which has no cement content in it. Geopolymer mortar can be produced using agricultural and industrial wastes like cassava peel ash (CPA), rice husk ash (RHA), metakaolin (MK), fly ash (FA), and many more. Geopolymer have been proven recently to be the way of converting agricultural, thermal and industrial waste into construction repair materials. When comparing Ordinary Portland Cement (OPC) mortar with geopolymer mortar, geopolymer mortar is considered as a highly eco-friendly product. This paper evaluates the compressive and shear bond strength properties of geopolymer mortar manufactured using Cassava Peel Ash (CPA) and Metakaolin (MK). Sodium silicate (Na2SiO3) and 9 molar concentration of sodium hydroxide (NaOH) solution were used as alkaline activator. The mass ratios of sodium silicate to sodium hydroxide (NS: NH) and the binder to fine aggregate (B: A) were fixed to 2.5 and 0.4 respectively. The compressive strength of the synthesized GPM were determined at 3, 7 and 28-days. The compressive strength at 28 days curing was 46.5 N/mm2. Results revealed that 50% replacement of MK with CPA made with 9M concentration of NaoH enhanced the compressive strength of the mortar while 100% CPA content in the mortar demonstrated the highest shear bond strength value. The grooved surface improved the bonding strength. The bond strength results have proven that the surface texture must be considered in determining the bond strength. It is concluded that geopolymer mortar incorporating 100 percent metakaolin could be used in the construction industry with the almost negligible amount of environmental problems.