GRANÜLER YOL TABAKALARININ YERİNDE DEĞERLENDİRME YÖNTEMLERİ: DİNAMİK KONİ PENETROMETRE (DCP) TESTİ

Abstract

Ülkemizde granüler üstyapı tabakalarının (taban zemini, alttemel ve temel) sahada kalite kontrol ve değerlendirme süreçleri halen, bu tabaka malzemelerinin yerinde klasik yoğunluk ve su muhtevası ölçümlerine dayanmaktadır. Üstyapı tasarımında ampirik yöntemlerden mekanistik-ampirik yöntemlere geçilmesi ile birlikte granüler yol tabakalarının, kalite kontrol ve değerlendirilmesinde yoğunluk ölçüm yöntemlerinden tabaka dayanım ölçümlerine geçilmesi gerekliliği son yıllarda artan bir araştırma konusu olmuştur. Yoğunluk ve su muhtevası bilgileri granüler tabakaların mühendislik özellikleri hakkında yeterli bilgiyi vermemekte dolayısıyla tasarım ile kalite kontrol arasında kuvvetli bir bağ oluşturulamamaktadır. Dinamik Koni Penetrometre (DCP) testi, taban zemini ve granüler üstyapı tabakalarının yerinde dayanımlarını belirlemede kullanılan tahribatsız, etkili, hızlı ve güvenilir bir test yöntemidir. Bu çalışmada, DCP cihazının özellikleri, testlerin uygulanması ve sonuçlarının değerlendirilmesi ile ilgili bilgilere yer verilmiş ve bu test ile ilgili literatürde yer alan çalışmalar özetlenmiştir. Literatürde yer alan çalışmalar incelendiğinde ülkemizde bu konu ile ilgili oldukça az araştırma yapıldığı görülmüştür. DCP gibi yerinde dayanım ölçen test yöntemlerinin ülkemiz kalite kontrol şartnamelerine adaptasyonu, üstyapı tasarım ve bakım onarım mühendislerinin granüler yol tabakalarının mekanik özellikleri hakkında daha fazla bilgi sahibi olmalarını sağlayacaktır.

Keywords

• DCP, tahribatsız testler, granüler yol tabakaları

INSITU EVALUATION METHODS OF GRANULAR PAVEMENT LAYERS: DYNAMIC CONE PENETROMETER (DCP) TEST

Abstract

In our country, in-situ quality control/quality assurance (QC/QA) of granular pavement layers (subgrade, subbase and base) still relies on their density and moisture measurements. With the coming changes from an empirical to mechanistic-empirical pavement design methods, it becomes essential to move towards changing the QC/QA procedures of compacted granular materials from a unit weight-based criterion to a stiffness/strength based criterion. Unit weight criteria unable to provide sufficient information about the engineering properties of granular layers, thus a missing link occurs between the design process and construction quality control. Dynamic Cone Penetrometer (DCP) is a non-destructive, effective, fast and reliable testing method which is used to determine the stiffness/strength of granular pavement layers and subgrade. In this study, information about the DCP test device, implementation and evaluation of the test results are given, and studies are summarized in the literature. It is seen that very limited research has been done in our country on this subject. Adaptation of in-situ stiffness/strength measuring test device such as DCP to quality control/quality assurance specifications of our country will make it possible to provide more information about the mechanical properties of the granular pavement layers for the pavement design and maintenance engineers.

Keywords

• DCP, nondestructive tests, granular pavement layers

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