2018
DOI: 10.5755/j01.ms.24.4.18829
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Behaviour of Geopolymer Mortars after Exposure to Elevated Temperatures

Abstract: In this study it was investigated the behavior of class F fly ash based geopolymer mortars subjected to elevated temperatures. Geopolimer composites were prepared with CEN-sand, water, fly ash as the binder, nSiO2Na2O and NaOH mixture combination as alkali activator. After mixing fresh geopolymer mixture, prismatic specimens were prepared using 40 mm × 40 mm × 160 mm prism molds. After molding, fresh geopolymer mortar samples with their mold were subjected to heat curing at 50 °C, 60 °C, 70 °C, 80 °C, 90 °C an… Show more

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Cited by 23 publications
(31 citation statements)
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“…For this reason, as in some studies, it was preferred to use NaOH alone as an activator in this study 14,29 . In literature, it is stated that it is required to use a Na/binder ratio at least 10%, in production of geopolymers incorporating high class F fly ash with high SiO 2 content, to obtain a compressive strength over 10–15 MPa 6,7,9,14,28 . However, geopolymers containing slag, slag‐fly ash and kaolin can have good results at Na/binder ratio of 10% or less 27,34 …”
Section: Materials and Methodologymentioning
confidence: 88%
“…For this reason, as in some studies, it was preferred to use NaOH alone as an activator in this study 14,29 . In literature, it is stated that it is required to use a Na/binder ratio at least 10%, in production of geopolymers incorporating high class F fly ash with high SiO 2 content, to obtain a compressive strength over 10–15 MPa 6,7,9,14,28 . However, geopolymers containing slag, slag‐fly ash and kaolin can have good results at Na/binder ratio of 10% or less 27,34 …”
Section: Materials and Methodologymentioning
confidence: 88%
“…Bu şekilde üretilen bağlayıcılar ile üretilen betonlara geopolimer beton ismi verilmektedir [19]. Aktivasyon işleminde sodyum hidroksit (NaOH) [20], potasyum hidroksit (KOH) [21], sodyum silikat (Na [24][25]. Geleneksel portland çimentoda görülen C-S-H jeli, alkali aktivasyonu ile üretilen geopolimerlerde N-A-S-H veya C-A-S-H jeli olarak gözlenmektedir [26][27].…”
Section: Introductionunclassified
“…Bununla birlikte karışımda kullanılan cüruf ve UK gibi bağlayıcıların yapısındaki Si/Al oranlarının da bağ yapısı üzerinde etkileri bulunmaktadır [28][29]. UK içeren geopolimerin dayanım kazanması için sıcaklık kürüne ihtiyaç duyulmaktadır [20,24]. Yüksek fırın cürufu ve metakaolin esaslı geopolimerlerde 60 °C-80 °C sıcaklık dayanım için yeterli olurken [30][31], UK esaslı geopolimerlerde 80°C-110°C aralığında sıcaklık gerekmektedir [20,24].…”
Section: Introductionunclassified
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