Investigation of the Effect of Recycled Concrete Aggregate Addition on the Strength Parameters of Sandy Soils

Yıl 2023, Cilt: 13 Sayı: 2, 316 - 328, 29.12.2023

Hüseyin Suha Aksoy , Atakan Yıldırım

Öz

Large quantities of waste are generated during the construction of new buildings and demolition of existing structures. Outdoor storage or disposal of waste poses significant environmental and health risks. The use of Recycled Concrete Aggregate (RCA) in construction projects is a crucial strategy for sustainable growth, both financially and environmentally. In this study, the strength properties of sand soil reinforced with construction and demolition waste were investigated. In the experiments, soil with 80% relative density was used to model compacted embankments on site. This sand soil was first prepared without additives and a shear box test was performed to determine the angle of internal friction. The sand soil was then mixed with RCA which sieved between 2 mm and 4.76 mm with 5%, 10%, 15% and 20% by weight. Strength parameters were determined for each RCA ratio. The same experiments were repeated using RCA with dimensions between 4.76 mm and 6.30 mm. As a result of the experiments, it was determined that the unit volume weight of the soil increased by up to 4% and the angle of internal friction increased by up to 14% as the RCA ratio increased. It was also observed that the angle of internal friction increased with increasing RCA ratio.

Anahtar Kelimeler

Aggregate size, Internal friction angle, Recycled concrete aggregate, Sandy soil, Shear box test

Geri Dönüştürülmüş Beton Agregası Katkısının Kumlu Zeminlerin Mukavemet Parametreleri Üzerindeki Etkisinin İncelenmesi

Öz

Yeni binaların inşası ve mevcut yapıların yıkılması sırasında büyük miktarlarda atık ortaya çıkmaktadır. Atıkların açık havada depolanması veya bertaraf edilmesi önemli çevre ve sağlık riskleri oluşturmaktadır. İnşaat projelerinde Geri Dönüştürülmüş Beton Agregasının (GDA) kullanılması, hem finansal hem de çevresel açıdan sürdürülebilir büyüme için çok önemli bir stratejidir. Bu çalışmada, inşaat ve yıkım atıklarıyla güçlendirilmiş kum zeminin mukavemet özellikleri incelenmiştir. Deneylerde, sahadaki sıkıştırılmış dolguları modellemek için %80 rölatif sıkılık sahip bir zemin kullanılmıştır. Bu kum zemin önce katkısız olarak hazırlanmış ve içsel sürtünme açısını belirlemek için kesme kutusu deneyi yapılmıştır. Kum zemin daha sonra ağırlıkça %5, %10, %15 ve %20 oranında 2 mm ile 4.76 mm arasında elenmiş GDA ile karıştırılmış ve her bir GDA oranı için mukavemet parametreleri belirlenmiştir. Aynı deneyler, boyutları 4.76 mm ile 6.30 mm arasında olan GDA kullanılarak tekrarlanmıştır. Yapılan deneyler sonucunda, GDA oranı arttıkça zeminin birim hacim ağırlığının %4’e varan oranlarda artış gösterdiği ve içsel sürtünme açısının ise %14’e varan oranlarda artış gösterdiği belirlenmiştir. Artan GDA boyutu ile içsel sürtünme açısının da artış gösterdiği görülmüştür.

Anahtar Kelimeler

Agrega boyutu, Geri Dönüştürülmüş Beton Agregası, İçsel sürtünme açısı, Kesme kutusu deneyi, Kumlu zemin.

Kaynakça

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