Asfalt Beton Malzemelerin Karma Mod (I-II) Kırılma Özelliklerinin Araştırılması

Year 2023, Volume: 6 Issue: 1, 36 - 46, 31.07.2023

Nazife Erarslan

https://doi.org/10.53410/koufbd.1185096

Abstract

Bu çalışmada, asfalt beton (AC) numunelerinde çatlak oluşumunu ve yayılmasını araştırmak için Yarı Dairesel Disk Eğilme (SCB) numuneleri ile deneysel, analitik ve sayısal analiz araştırmaları yapılmıştır. Bu çalışmanın amacı, AC malzemelerin karma mod I-II (çekme ve kesme) kırılmasını analiz etmek için ASTMD8044 standardının sadece mod I için değil karma modu test etmede uygulanabilirliğini araştırmaktır. Gerilme dağılımı ve çatlak ilerleme sayısal analizleri, kırılma mekaniği programı FRANC2D kullanılarak yapıldı. AC numunelerinin mod I (çekme) kırılma tokluğu (KIC) değerinin 0.45 MPa√m olduğu bulunmuştur. Öte yandan, β= 30 için mod II kırılma tokluğu (KIIC) değeri 0.17 MPa√m ve β=45 için mod II değeri ise 0,19 MPa√m olarak bulunmuştur.
Sayısal analizlerle Kritik Çatlak Eşiği (CCT) çatlak uzunluğu 2-3 mm olarak bulunmuştur. Bu sonuç, hem deneysel bulgular hem de CCT analitik analiz sonuçları ile uyumludur. FRANC2D analizlerinde kohezif çatlak yüzeyleri arasında en belirgin kayma 30 eğimli çatlak ile gözlenmiştir. AC numunelerinde ‘kanat çatlak’ büyümesi literatürde ilk kez hem deneysel hem de sayısal analizlerle bu çalışma ile elde edilmiştir. Elde edilen deneysel, analitik ve sayısal sonuçlara göre, bu çalışmanın sadece mod I için önerilen ASTMD8044 test standardının AC malzemelerin karma mod I-II kırılma tokluğunun belirlenmesi için yeni bir uluslararası standart çalışmalarına yol göstereceğine inanılmaktadır.

Keywords

Asfalt Beton (AC), AC ve Karma Mod I-II Kırılma, AC ve Mod I Kırılma, Asfalt Beton ve Kohezif Çatlak

Supporting Institution

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Project Number

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Thanks

Yazar, bu araştırmada numune temininde yardımcı olan ve desteklerini esirgemeyen Karayolları 2.Bölge Müdürlüğü-İzmir ve Ar-Ge Başmühendisi Kanat Uğur Aydın Bey’e ve deneyler sırasında yardımcı olan İzmir Demokrasi Üniversitesi Yüksek Lisans öğrencisi Mehmet Kartal’a teşekkürlerini sunar.

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