The effect of silica fume and micro SiO2 additive on the strength properties in kaolin based geopolymer mortars

Öz

In this study, the effects of silica fume (SD) and micro SiO2 (MS) additives on the strength properties of geopolymer mortars produced using kaolin were investigated. The binder was prepared by adding 3%, 6% and 9% by weight of SD and MS into the kaolin separately. The binders were activated with NaOH containing 11%, 13%, 15% and 17% sodium (Na) by weight. The mixture consisting of binder, sand, NaOH and water was mixed in the mortar mixer and placed in the molds, and an activation temperature of 110 ºC was applied for 24 hours. Then, the samples that were removed from the mold were kept at room temperature for up to 28 days. Unit weight, void ratio, water absorption, ultrasound pulse velocity, flexural and compressive strength tests were performed on the samples. As a result of the experiments, the compressive strength of 21.4 MPa and 45.3 MPa was determined in samples containing 9% SD and 11% Na, 9% MS and 17% Na, respectively. In samples containing 11% and 13% Na by weight, no positive effect of SD and MS was observed on the strength, and SD and MS additives were found to increase the strength in samples produced with 15% and 17% Na.

Anahtar Kelimeler

• Kaolin
• Geopolymer
• Silica fume
• Flexural strength
• Compressive strength

Kaolin esaslı geopolimer harçlarda silis dumanı ve mikro SiO2 katkısının dayanım özellikleri üzerine etkisi

Öz

Bu çalışmada, kaolin kullanılarak üretilen geopolimer harçlarda, silis dumanı (SD) ve mikro SiO2 (MS) katkısının dayanım özellikleri üzerine etkisi incelenmiştir. Kaolin içeresine ağırlıkça %3, %6 ve %9 oranında SD ve MS ayrı ayrı katılarak bağlayıcı hazırlanmıştır. Bağlayıcılar, ağırlıkça %11,%13, %15 ve %17 sodyum (Na) içeren NaOH ile aktive edilmiştir. Bağlayıcı, kum, NaOH ve sudan oluşan karışım, harç mikseri içerisinde karıştırılıp kalıplara yerleştirildikten sonra 24 saat süre ile 110 ºC aktivasyon sıcaklığı uygulanmıştır. Daha sonra kalıptan çıkarılan numuneler 28 güne kadar oda sıcaklığında bekletilmiştir. Numuneler üzerinde birim ağırlık, boşluk oranı, su emme, ultrases geçiş hızı, eğilme ve basınç dayanımı deneyleri yapılmıştır Deneyler sonucunda, %9 SD ve %11 Na ile %9 MS ve %17 Na içeren numunelerde sırasıyla 21.4 MPa ve 45.3 MPa basınç dayanımı tespit edilmiştir. Ağırlıkça %11 ve %13 Na içeren numunelerde SD ve MS katkısının dayanım üzerinde olumlu etkisi gözlenmemiş, %15 ve %17 Na ile üretilmiş numunelerde ise SD ve MS katkısının dayanımı artırdığı tespit edilmiştir.

Anahtar Kelimeler

• kaolin
• geopolimer
• silis dumanı
• eğilme dayanımı
• basınç dayanımı

Kaynakça

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