Lelian ELKHATİB, Jamal KHATİB, Adel ELKORDİ, Seyhan FIRAT

Phragmites Australis Külü İçeren Harcın Toplam ve Kılcal Su Emmesi Üzerine Deneysel Bir Çalışma

Biyokütle küllerinin çimento yerine kullanılması, çimento üretim sürecinin neden olduğu kirlilik seviyelerindeki büyük artış nedeniyle dikkate değer ve son yıllarda araştırmacılar tarafından önem verilen konular arasına girmiştir. Phragmites Australis Ashes (PAA), kapalı bir kapta yakılarak atmosfere salınan CO2 emisyonunu azalttığı için çimentoya çevre dostu bir alternatif olabilir. Ayrıca PAA, yerel olarak bulunduğundan ve Lübnan'daki nehirlerin kıyılarında yoğun bir şekilde büyüdüğünden ekonomik bir malzeme olarak kabul edilir. Kısmi çimento ikamesi ile üretilen harç karışımlarının performansı, PAA'nın çimento ikamesi olarak kullanılması için büyük bir potansiyel ortaya koyan bu yazıda değerlendirilmiştir. Harç numunelerindeki çimento, ağırlıkça %0, 10, 20 ve %30 PAA ile değiştirilmiştir. Karışım oranları ve su/çimento oranı tüm dökülen karışımlar için sabit tutulmuştur. Farklı PAA yüzdeleri içeren toplam su emme ve kılcal su emme dahil olmak üzere dayanıklılık özellikleri, kontrol numunesine kıyasla 1, 7, 28 ve 90 günlük kürleme yaşlarında değerlendirilmiştir. Test sonuçları, karışımlarda PAA yüzdesi arttıkça toplam su emme yüzdelerinde bir artış olduğunu göstermektedir. Aynı eğilim kılcal su emme testi için de elde edilmiştir.

Anahtar Kelimeler:

Sürdürülebilirlik, biyo-kül, phragmites australis külü, karbon ayak izinin azaltılması, çimento ikamesi

An Experimental Study on the Total and Capillary Water Absorption of Mortar Containing Phragmites Australis Ash

The use of biomass ashes as cement replacement have become a notable and trending aspect due to the huge increase in the pollution levels caused by the manufacturing process of cement. Phragmites Australis Ashes (PAA) can be an eco-friendly alternative to cement since it can be burnt in a closed container decreasing the CO2 emissions into atmosphere. Also, PAA is considered an economical material since it is available locally and grows massively on the banks of the rivers in Lebanon. The performance of mortar mixes produced by a partial replacement of cement were evaluated in this paper revealing a big potential for PAA to be used as cement replacement. Cement in mortar specimens was replaced by 0, 10, 20 and 30% by weight PAA. Mix proportions and water to binder ratio were set constant for all casted mixes. Durability properties, including total water absorption and capillary water absorption, containing different PAA percentages were evaluated at 1, 7, 28 and 90 days of curing ages in comparison to the control specimen. The test results show an increase in the total water absorption percentages as PAA percentage is enhanced in mixes. The same trend was also obtained for capillary water absorption test.

Keywords:

Sustainability, bio-ash, phragmites australis ash, carbon footprint reduction, cement replacement,

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