Thermally treated waste silt as filler in geopolymer cement
Solouki, Abbas and Fathollahi, Alireza and Viscomi, Giovanni and Tataranni, Piergiorgio and Valdrè, Giovanni and Coupe, Stephen J. and Sangiorgi, Cesare (2021) Thermally treated waste silt as filler in geopolymer cement. Materials, 14 (17). 5102. ISSN 1996-1944 (https://doi.org/10.3390/ma14175102)
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Abstract
This study aims to investigate the feasibility of including silt, a by-product of limestone aggregate production, as a filler in geopolymer cement. Two separate phases were planned: The first phase aimed to determine the optimum calcination conditions of the waste silt obtained from Società Azionaria Prodotti Asfaltico Bituminosi Affini (S.A.P.A.B.A. s.r.l.). A Design of Experiment (DOE) was produced, and raw silt was calcined accordingly. Geopolymer cement mixtures were made with sodium or potassium alkali solutions and were tested for compressive strength and leaching. Higher calcination temperatures showed better compressive strength, regardless of liquid type. By considering the compressive strength, leaching, and X-ray diffraction (XRD) analysis, the optimum calcination temperature and time was selected as 750 °C for 2 h. The second phase focused on determining the optimum amount of silt (%) that could be used in a geopolymer cement mixture. The results suggested that the addition of about 55% of silt (total solid weight) as filler can improve the compressive strength of geopolymers made with Na or K liquid activators. Based on the leaching test, the cumulative concentrations of the released trace elements from the geopolymer specimens into the leachant were lower than the thresholds for European standards.
ORCID iDs
Solouki, Abbas, Fathollahi, Alireza ORCID: https://orcid.org/0000-0002-2394-4050, Viscomi, Giovanni, Tataranni, Piergiorgio, Valdrè, Giovanni, Coupe, Stephen J. and Sangiorgi, Cesare;-
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Item type: Article ID code: 81423 Dates: DateEvent6 September 2021Published31 August 2021AcceptedSubjects: Technology > Engineering (General). Civil engineering (General) > Environmental engineering Department: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 08 Jul 2022 14:26 Last modified: 12 Dec 2024 13:24 URI: https://strathprints.strath.ac.uk/id/eprint/81423