Geopolymerisation of un-calcined kaolin by the novel heat curing method
Küçük Resim Yok
Tarih
2022
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Korean Assoc Crystal Growth, Inc
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, heat curing technique (up to 320 degrees C) that allows the usage of sodium silicate solutions with un-calcined kaolins to offer a durable geopolymeric binder in a short time was investigated. Samples containing up to 40 wt.% binder have been produced to observe the binder behaviour over a wide range of additions by heat curing for one hour. The cured samples consist of kaolinite and amorphous phase and crystallinity was decreased with increasing curing temperatures. 240 degrees C was the threshold temperature for the strength development of the samples. Condensation reactions between Al-OH- units in uncalcined kaolin and silanol groups in sodium silicate solution that yield sialate (Si-O-Al-O) bridges detected by infrared analyses are the considered mechanisms of promoter effects of kaolinite. Optimum compressive strength (23.4 MPa.) was obtained with the samples produced with 20 wt.% binder addition and 300 degrees C curing temperature.
Açıklama
Anahtar Kelimeler
Kaolinite, Geopolymer, Sodium silicate, Heat curing
Kaynak
Journal of Ceramic Processing Research
WoS Q Değeri
Q3
Scopus Q Değeri
Q3
Cilt
23
Sayı
1
