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oai:bayburt-rdlopen.rawdatalibrary.net:bayburt/140562026-10-29T20:01:39Zopenairedrivercom_bayburt_10000col_bayburt_10001com_bayburt_10007col_bayburt_10223

Development of Eco-Efficient Fly Ash-Based Alkali-Activated and Geopolymer Composites with Reduced Alkaline Activator DosageGökçe, H. S.Tuyan, M.Ramyar, K.Nehdi, M. L.Fly ashGeopolymerAlkaline solutionAggregate-to-ash ratioPre-setting pressureCompressive strengthPore structureThe eco-efficiency and economy of geopolymer composites largely depend on their alkaline activator dosage. In this study, the effect of applying a pre-setting pressure and variation of the aggregate-to-fly ash ratio on the alkaline solution dosage and mechanical strength of fly ash-based geopolymer composites was explored. It is shown that through control of the aggregate-to-ash ratio and application of pre-setting pressure, compressive strength could be increased by 102% and 86% for Class F fly ash-based geopolymer and alkali-activated Class C fly ash-based mixture, respectively. The total alkaline solution consumption could be reduced from 718 to 188 kg/m(3) and from 769 to 262 kg/m3 for Class F fly ash-based geopolymer and alkali-activated Class C fly ash-based mixture, respectively. The proposed method reduced the alkaline solution consumption per compressive strength (6.2 kg.m(-3).MPa-1) by up to 85% compared to that of the reference manually consolidated control geopolymer. The findings demonstrate that fly ash-based geopolymers could be made more sustainable and eco-efficient through tailored production techniques. (C) 2019 American Society of Civil Engineers.ASCE-AMER SOC CIVIL ENGINEERS2020-02Articlehttps://rdlopen.rawdatalibrary.net/r/bayburt/14056https://doi.org/10.1061/(asce)mt.1943-5533.00030170899-1561enJOURNAL OF MATERIALS IN CIVIL ENGINEERINGinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://bayburt-rdlopen.rawdatalibrary.net/tr/items/bayburt/14056