İnce Agrega Kısmında Kireçtaşı Kullanılan Taş Mastik Asfaltın Çatlama Davranışının İncelenmesi

Öz

Son yıllarda ağır trafik yükleri altında daha uzun ömürlü olması nedeniyle Taş Mastik Asfalt uygulamaları artmıştır. Ancak ülkemizde Taş Mastik Asfalt tasarımında kullanılan agregaların kaba ve ince kısımlarının Karayolları Teknik Şartnamesine göre aynı ocaktan elde edilmesi gerekmektedir. Bu çalışmada, kaba agrega fraksiyonu için bazalt, ince agrega fraksiyonu için ise kireçtaşı kullanılmasının olumlu sonuçlar vereceği varsayımıyla deneysel çalışmalar gerçekleştirilmiştir. Deneysel çalışmada, AASHTO T 393 standardına uygun olarak Illinois Esneklik İndeksi deneyi ile kırılma mekaniği özellikleri belirlenmiştir. Bu çalışma sonucunda, Taş Mastik Asfaltın ince agrega kısmında kireçtaşı kullanımının olumsuz sonuç meydana getirmediği tespit edilmiştir.

Anahtar Kelimeler

• Illinois esneklik indeksi
• yarı dairesel eğilme deneyi
• taş mastik asfalt
• kireçtaşı
• bazalt

Investigation of Cracking Behaviour of Stone Mastic Asphalt Using Limestone as Fine Aggregate

Öz

In recent years, Stone Mastic Asphalt applications have increased due to its longer life under heavy traffic loads. However, in our country, the coarse and fine fraction of aggregates used in Stone Mastic Asphalt design should be obtained from the same quarry according to the Highways Technical Specifications. In this study, experimental studies were carried out with the assumption that using basalt for the coarse aggregate fraction and limestone for the fine aggregate fraction would yield positive results. In the experimental study, fracture mechanics properties were determined by the Illinois Flexibility Index test in accordance with AASHTO T 393 standard. As a result of this study, it was determined that the use of limestone in the fine aggregate fraction of Stone Mastic Asphalt does not produce negative results.

Anahtar Kelimeler

• Illinois flexibility index
• semi-circular bending test
• stone mastic asphalt
• limestone
• basalt

Kaynakça

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