The role of Na2O dosage in iron-rich fly ash geopolymer mortar

• Autorzy: Patrisia Yulin , Law David , Gunasekara Chamila , Wardhono Arie

Identyfikatory

DOI

10.1007/s43452-022-00509-2

• Języki publikacji: EN

Abstrakty

EN

It has been reported that the use of Class F fly ash with high iron content can reduce compressive strength when used to produce geopolymer concrete. This limitation has constrained the utilization of iron-rich fly ash in the production of geopolymeric materials. To provide increased clarity, this study investigates the compressive strength and microstructural development of iron-rich fly ash geopolymer mortar employing a range of sodium hydroxide/sodium silicate activator ratios. The study assesses Na2O dosage of 7.5, 10 and 15% with an alkali modulus (AM) ranging from 1.00 to 1.875 and identifies optimum performance using Analysis of Variance and Signal to Noise techniques. A Na2O dosage of 10% and AM 1.375 gave the optimum strength at 7, 28 and 90-days. This gave a compressive strength of 44.9 MPa (28-days) and 53.5 MPa (90-days). For the optimum mix design, reduction in strength was evident with high iron incorporation into the geopolymer matrix. A higher Na2O dosage resulted in increased dissolution and a decrease in average pore size, but an increase in total porosity. Moreover, a higher concentration of Na2O also correlated with increased carbonate products, in the form of carbonation and efflorescence. In addition, specimens synthesized with a higher concentration of Na2O dosage indicated a potential for high thermal durability.

Słowa kluczowe

EN

iron-rich fly ash; geopolymer; Na2O; compressive strength; microstructural

PL

popiół lotny; geopolimer; wytrzymałość na ściskanie; mikrostruktura

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2022
• Tom: Vol. 22, no. 4
• Strony: art. no. e181, 2022
• Opis fizyczny: Bibliogr. 55 poz., rys., wykr.

Twórcy

autor

Patrisia Yulin

• Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, Australia

autor

Law David

• Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, Australia

autor

Gunasekara Chamila

• Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, Australia

autor

Wardhono Arie

• Civil Engineering, Universitas Negeri Surabaya, Kampus UNESA Ketintang, Surabaya 60231, Indonesia

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)