Economic and Structural Evaluation of the Flexible Pavements Constructed with Different Construction and Demolition Wastes as Aggregates in Their Granular Bases

Yıl 2023, , 734 - 751, 15.06.2023

Orhan Kaya , Bahadır Ok

https://doi.org/10.31466/kfbd.1288042

Öz

Recently, many studies have been searching for alternative sustainable road materials to natural crushed stone aggregate (NA) due to both its limited production and the destruction of the environment in the production stages. In this context, the aim of this study is to investigate the effect of the use of recycled aggregates as a granular base material, the granular base has specific gradation and aggrepate properties, called plant mix base (PMT), on flexible pavement thickness and road construction cost. Within the scope of this study, NA and four different waste aggregates used in PMT were evaluated and pavement thicknesses for 135 different design scenarios, including three different road classes, natural soil bearing capacities and traffic conditions (5x3x3x3) were determined based on the AASHTO 93 pavement design method. The estimated road construction costs were also determined by using the unit prices of Turkish General Directory of Highway in 2023. When PMT formed with NA is used, it has been observed that the total asphalt pavement thickness was less than when using PMT formed with waste aggregates. Despite the differences in asphalt pavement thicknesses, the construction costs of the roads built with waste aggregates were found to be lower than those built with NA. It has been concluded that waste aggregates have the potential to be used in flexible pavement PMT layers due to the lack of excessive pavement thickness increase, the lower cost of road construction compared to that of NA and environmental benefits.

Anahtar Kelimeler

Flexible pavements, CDW, Granular base, AASHTO 93

Geri Dönüştürülmüş Farklı İnşaat ve Yıkıntı Atıklarının Yol Temellerinde Kullanımının Maliyet ve Esnek Üstyapı Kalınlığına Etkisinin Araştırılması

Öz

Günümüzde hem üretiminin sınırlı olması hem de üretim aşamalarının çevreyi tahrip etmesinden dolayı doğal kırma taş agregaya (DA) alternatif olabilecek sürdürülebilir yol malzemelerini araştırmak ön plana çıkmıştır. Bu bağlamda, bu çalışmanın amacı geri dönüştürülmüş agregaların plent miks temel (PMT) olarak kullanımının esnek üstyapı kalınlığına ve yol yapım maliyetine etkisinin araştırılmasıdır. Bu çalışma kapsamında DA ve dört farklı atık agrega PMT’de kullanılacak şekilde AASHTO 93 üstyapı tasarım yönteminde değerlendirilmiş ve üç farklı yol sınıfı, tabi zemin taşıma gücü ve trafik yoğunluğu olmak üzere (5x3x3x3) 135 farklı tasarım senaryosu için üstyapı kalınlıkları ile Karayolları 2023 yılı birim fiyatları kullanılarak yaklaşık yol yapım maliyetleri hesaplanmıştır. DA ile teşkil edilen PMT kullanıldığında toplam kaplama kalınlığının atık agregalarla teşkil edilen PMT’nin kullanılma durumuna göre daha az olduğu görülmüştür. Kaplama kalınlıklarındaki farklılıklara rağmen atık agregalarla inşa edilen yolların yapım maliyetleri DA ile inşa edilene göre daha düşük olmuştur. Kaplama kalınlığında fazla bir artış olmaması, yol yapım maliyetinin DA’ya göre daha az olması ve çevresel faydaları sebebi ile atık agregaların esnek üstyapı PMT tabakalarında kullanılma potansiyeline sahip olduğu sonucuna varılmıştır.

Anahtar Kelimeler

Esnek üstyapı, İnşaat ve yıkıntı atıkları, PMT, AASHTO 93

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