Effect of Molarity, Curing Time and Curing Temperature on Perlite Powder-Containing Slag-Based Geopolymers
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Tarih
2024
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Springer Int Publ Ag
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
As a result of the four-fold increase in the human population in the last century and the development of technology and industry, the use of natural resources, environmental protection, sustainability and the evaluation of waste materials have become one of the most important agenda items. The construction industry has also been affected by these developments, and in the last twenty years, studies have been carried out on the use of alternative binding materials instead of cement. Geopolymer production is one of the methods seen as an alternative to cement. Geopolymer production has given very positive results in terms of controlling CO2 emissions, evaluating waste materials, and protecting natural resources. At the same time, obtaining high strength at an early age by using heat curing is one of the important advantages of geopolymer. In this study, blast furnace slag (BFS), which is an industrial waste, and raw perlite powder (RPP) obtained from raw perlite, a natural aggregate, were used as binders. In this way, it is aimed to participate in the recycling of wastes and to use natural resources efficiently. Sodium hydroxide (NaOH), which does not emit CO2 in its production, was preferred as an activator. In this study, it was aimed to produce early high-strength geopolymer composites with materials with no/minimum level of CO2 emission. The molarity was chosen as 12, 14 and 16 molarities (M) in order to obtain early high strength. Curing temperature 60, 80, 100 and 110 & DEG;C was selected. Heat cure was applied for 24 and 48 h. Regression and ANOVA tests were applied on the results obtained. It has been revealed that the obtained compressive strength results are reasonable data. It has been observed that compressive strength estimation can be made with an accuracy of 82% in geopolymer composites. The internal structures of geopolymer composites were interpreted using SEM and EDX analyses. As a result, as the rate of RPP replacement instead of BFS increased, the amount of gel in the geopolymer composites decreased, and accordingly the compressive strength values decreased. The highest compressive strengths were obtained at 110 & DEG;C during the 24-h curing period. The optimum molarity was determined to be 14 M. The highest compressive strength was measured as 67.72 MPa in the sample cured at 110 & DEG;C for 24 h. Thanks to this study, it has been seen that approximately 70 MPa compressive strength can be obtained after one day by using materials with no CO2 emission/minimum level in their production. Increasing the curing time to 48 h increased the amount of microcracks and voids. Therefore, the compressive strengths of the geopolymer samples was adversely affected. It has been revealed that RPP can be used in the production of geopolymers, but research needs to be developed.
Açıklama
Anahtar Kelimeler
Geopolymer; Raw perlite powder; Compressive strength; Curing time; Curing temperature; Molarity; Early high strength; CO2 emission
Kaynak
Iranian Journal of Science and Technology-Transactions of Civil Engineering
WoS Q Değeri
Q3
Scopus Q Değeri
Q2
Cilt
48
Sayı
2
