Use of Waste Corn Cob Ash in Geopolymer Mortar Production

Abstract

Corn cob is an agricultural waste generated during the corn harvest. Storage of this waste creates various technical, social, and environmental problems. Alternative binder materials can be produced from the waste ash produced by burning corn cobs. The aim of this research is to determine the effects of the corn cob ash ratio on the physical, mechanical, and thermal properties of metakaolin based geopolymer mortar containing waste corn cob ash and the usage possibilities of the produced material in the construction sector. 10 molar sodium hydroxide and sodium silicate solutions were used as alkaline activators. The mixtures prepared with metakaolin:corn cob ash ratios of 100:0, 70:30, 50:50, 30:70, and 0:100 by weight were cured for 28 days under environmental conditions of 24±2°C and 60±5% relative humidity. As a result of the study, the lowest porosity (14.24%), water absorption ratio (5.56%), and the highest unit weight (1.99 g/cm3), ultrasound velocity (2.71 km/s), modulus of elasticity (14.61 GPa), flexural strength (3.87 MPa), and compressive strength (18.76 MPa) were obtained in the mortar containing 70% metakaolin and 30% corn cob ash. The thermal conductivity coefficient of the mortar is in the range of 0.21-1.22 W/mK, and this value decreases as the waste ash ratio increases. In other words, in applications where thermal performance criteria are important, materials with a higher waste ash content can be produced. Since the produced geopolymer mortars meet the requirements of traditional mortars and plasters in the construction industry, they have the potential to be used as an alternative to these materials.

Keywords

• Corn cob ash
• Waste utilization
• Geopolymer mortar

Atık Mısır Koçanı Külünün Jeopolimer Harç Üretiminde Kullanımı

Abstract

Mısır koçanı, mısır hasatı sırasında oluşan tarımsal bir atıktır. Bu atığın depolanması çeşitli teknik, sosyal ve çevresel sorunlar oluşturmaktadır. Mısır koçanının yakılmasıyla üretilen atık külden alternatif bağlayıcı malzemeler üretilebilmektedir. Bu araştırmanın amacı, atık mısır koçanı külü içeren metakaolin esaslı jeopolimer harcın fiziksel, mekanik ve ısıl özelikleri üzerinde mısır koçanı külü oranının etkilerini ve üretilen malzemenin yapı sektöründe kullanım olanaklarını belirlemektir. Alkali aktivatör olarak 10 molar sodyum hidroksit ve sodyum silikat çözeltileri kullanılmıştır. Metakaolin:mısır koçanı külü oranı ağırlıkça 100:0, 70:30, 50:50, 30:70 ve 0:100 olarak hazırlanan karışımlar, 24±2°C ve %60±5 bağıl nemli ortam koşullarında 28 gün kürlenmiştir. Çalışma sonucunda, en düşük porozite (%14.24), su emme oranı (%5.56) ve en yüksek birim hacim ağırlık (1.99 g/cm3), ultrases hızı (2.71 km/s), elastiklik modülü (14.61 GPa), eğilmede çekme (3.87 MPa) ve basınç dayanımı (18.76 MPa) %70 metakaolin ve %30 mısır koçanı külü içeren harçta elde edilmiştir. Harcın ısı iletkenlik katsayısı 0.21-1.22 W/mK aralığındadır ve atık kül oranı arttıkça bu değer azalmaktadır. Yani, ısıl performans kriterlerinin önemli olduğu uygulamalarda atık kül oranı daha yüksek malzeme üretilebilmektedir. Üretilen jeopolimer harçlar, yapı sektöründeki geleneksel harç ve sıvaların gereksinimlerini karşıladığından, bu malzemelere alternatif olarak kullanılma potansiyeline sahiptir.

Keywords

• Mısır koçanı külü
• Atık değerlendirme
• Jeopolimer harç

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