Zeinab NASSER EDDİNE, Firas BARRAJ, Jamal KHATİB, Adel ELKORDİ

Geçirimli Beton Kaplamada Doğal Agreganın Taban Külü ile Kısmi ve Tam İkamesinin Etkileri

Büzülme, dayanıklılığın ana kriterlerinden biridir. Betonun, özellikle de geçirimli betonun (PC) uzun süreçte hizmet verebilmesi için kontrol edilmesi gereklidir. Bu çalışma, doğal agreganın (NA) kısmi ve tam ikamesi olarak Lübnan kaynaklı belediye katı atık yakma taban külü (BA) içeren geçirgen beton kaplamanın (PCP) otojen büzülmesini ve genleşmesini incelemektedir. Doğal agreganınkine yakın parçacık boyutlarında, %0, 25, 50, 75 ve %100 BA (hacimce) olmak üzere çeşitli ikame oranlarına sahip beş ayrı geçirimli beton karışımı üretilmiştir. Çalışmada geçirimli betonların basınç dayanımı ve toplam gözenekliliği incelenmiş, bunlar arasındaki korelasyonlar analiz edilmiştir. Sonuçlar, BA içeriğindeki artışın, PC karışımlarının otojen büzülmesini, genleşmesini ve basınç dayanımını azalttığını göstermiştir. Bununla birlikte, BA içeriğindeki artış betonların toplam gözenekliliğini artırmıştır. Sonuçlar ayrıca çeşitli kürleme günlerinde basınç dayanımı ile otojen büzülme, genleşme ve porozite arasında ilişki olduğunu da ortaya koymuştur. Genleşme ile toplam porozite arasında ve basınç dayanımı ile toplam porozite arasında negatif bir korelasyon olduğu gösterilmiştir.

Anahtar Kelimeler:

Geçirgen, dip külü, otojen büzülme, genleşme, basınç dayanımı, gözeneklilik

Effect of Partial and Full Replacements of Natural Aggregate with Bottom Ash in Pervious Concrete Pavement

Shrinkage is a main criterion of durability. Its control is essential for the long-term serviceability of concrete, especially pervious concrete (PC). This study examines the autogenous shrinkage and expansion of pervious concrete pavement (PCP), including municipal solid waste incineration bottom ash (BA) from a Lebanon source as a partial and full replacement of natural aggregate (NA). Five pervious concrete mixes were produced with various BA replacement ratios of 0, 25, 50, 75, and 100% BA (by volume), with comparable particle sizes to those of the natural aggregate. The study also investigates the compressive strength and total porosity of pervious mixes and analyzes the correlations between them. Results showed that the increase in BA content decreased the autogenous shrinkage, expansion, and compressive strength of PC mixes. However, it increases the total porosity of the mix. Results also present the correlations between compressive strength and autogenous shrinkage, expansion, and porosity at various curing days. A negative correlation was shown between expansion and total porosity, as well as between compressive strength and total porosity.

Keywords:

Pervious, bottom ash, autogenous shrinkage, expansion, compressive strength, porosity,

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