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    Assessment of strength and abrasion resistance of elasto-plastic fiber reinforced concrete using geopolymer based recycled aggregates
    (Yıldız Teknik Üniversitesi, 2021) Mohamed, Abdelaziz; Canpolat, Orhan; Al-Mashhadani, Mukhallad M.
    Recycled aggregates and geopolymer binders are green materials contributing to the sustainability of the planet. We investigated the performance of geopolymer concrete using recycled aggregates (fly ash (FA) and ground granulated blast furnace slag (GGBS)) related to their mechanical properties. Geopolymer concrete were prepared by mixing 50% low calcium fly ash, 50% GGBS, sodium hydroxide and sodium silicate solution, Coarse aggregate (Natural coarse aggregate, Recycled coarse aggregate), Fine aggregate (Crushed Sand, Riverbed Sand) and elastoplastic fibers. Recycled aggregate used was obtained locally from Istanbul, Turkey. To explore the efficiency of recycled aggregate, during the production of geopolymer concrete, partial replacement of recycled coarse aggregate with natural aggregate was made in 10, 20, 30, and 40%. To compare the results, geopolymer concrete containing 100% natural aggregates was made. Since concrete gains strength with time after casting, On Day-28 and Day-90, the compressive strength, split tensile strength, and flexural strength of those geopolymer based concrete were examined. Results of the test showed that the compressive strength of 28 and 90 days w.r.t. different ratios was 26.8, 25.3, 24.2, 23.1, 23 MPa, and 30.2, 28.1, 27.0, 25.2, 25.0, 23.0 Mpa respectively, while split tensile strength was 1.9, 1.5, 1.5, 1.4, 1.4 MPa and 2.0, 1.9, 1.9, 1.6, 1.5 MPa respectively, and the ultimate flexural strength of tested beams were in the range of 3.53 to 4.54MPa. Although the general performance of the produced samples was showing a decrement with the increasing ratio of recycle aggregates, the obtained results indicated that using recycled aggregate is up to some extent of 30% is beneficial in terms of strength.
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    Öğe
    Mechanical performance of fly ash-GGBS elasto-plastic fiber reinforced geopolymer concrete containing recycled aggregates
    (American Institute of Physics Inc., 2023) Mohamed, Abdelaziz; Canpolat, Orhan; Al-Mashhadani, Mukhallad M.
    Recycled aggregates and Geopolymer binders are green materials that can contribute to the sustainability of the planet. This study investigated the Performance of recycled Aggregates on mechanical properties of Fly Ash and GGBS Based Geopolymer Concrete. Specimens of Geopolymer concrete were made by mixing low calcium fly ash, GGBS, sodium hydroxide and sodium silicate solution, coarse recycled aggregates, fine aggregates, natural aggregates and fibers. Recycled aggregate used was obtained locally in Istanbul Turkey. Through the mixes of geopolymer concrete the recycled aggregate was partially replaced of natural aggregate in different proportions at 10, 20, 30 and 40% respectively, also geopolymer concrete of 100% natural aggregate was used as a control specimen. compressive strength split tensile strength, and flexural strength of this geopolymers were examined at 28 and 90 days. Results of the test showed that the compressive strength of 28 and 90 days was in the range of 28.9-30.2 MPa while split tensile strength was between 1.9-2.0 MPa and the ultimate flexural strength of tested beams were in the range of 3.53 -4.54 MPa. Although the general performance of the produced samples was showing a decrement with the increasing ratio of recycle aggregates, the obtained results indicated that using recycled aggregate is up to some extent is beneficial in terms of sustainability. © 2023 AIP Publishing LLC.