Investigating the effects of aggregate gradation on Marshall parameters of bituminous hot mixtures

Year 2023, Volume: 11 Issue: 2, 486 - 497, 23.06.2023

Deniz Arslan , Hüseyin Köse

https://doi.org/10.29109/gujsc.1222037

Abstract

In this study, it was aimed to investigate the effects of aggregate gradation on the physical properties of bituminous hot mixtures. Accordingly, the gradation envelope defined for the binder course in the 2013 Highway Technical Specification was taken as basis. Five different aggregate gradations were generated as the average, the lower limit, and the upper limit values of the gradation envelope together with by shifting the lower and upper limits of the envelope by 7% and Marshall designs were applied for each of them. Values outside the gradation envelope were included in the study in order to predict the performance changes in bituminous mixture due to the gradation errors that may occur during operation process. The effects of aggregate gradation on the stability, flow, unit weight (Dp), air void ratio (Vh), void filled with bitumen ratio (Vf), voids in mineral aggregate ratio (VMA) and Marshall quotient of bituminous hot mixtures were evaluated according to the test data obtained. It was determined that the increase or decrease in aggregate size compared to the average gradation generated a decrease in Dp and Vf values, and an increase in VMA and Vh values. Also, stability values were observed to be increased towards the upper limit of the gradation envelope.

Keywords

Binder course, Aggregate gradation, Marshall design, Marshall parameters

Agrega Gradasyonunun Bitümlü Sıcak Karışımların Marshall Parametreleri Üzerindeki Etkilerinin Araştırılması

Abstract

Bu çalışmada, agrega gradasyonunun bitümlü sıcak karışımların fiziksel özellikleri üzerindeki etkilerinin araştırılması amaçlanmıştır. Bu doğrultuda, 2013 yılı Karayolu Teknik Şartnamesinde binder tabakası için tanımlanan gradasyon zarfı esas alınmıştır. Gradasyon zarfına ait ortalama, alt limit, üst limit değerleri ile birlikte alt ve üst limitlerin % 7 oranında ötelenmesiyle elde edilen beş farklı agrega gradasyonu oluşturulmuş ve her biri için ayrı ayrı Marshall tasarımları yapılmıştır. Gradasyon zarfının dışındaki değerler, çalışma esnasında oluşabilecek gradasyon hatalarının bitümlü karışımda meydana getirebileceği performans değişimlerinin öngörülebilmesi amacıyla çalışmaya dahil edilmiştir. Elde edilen test verilerine göre agrega gradasyonunun bitümlü sıcak karışımların stabilite, akma, birim ağırlık (Dp), hava boşluğu oranı (Vh), bitümle dolu boşluk oranı (Vf), agregalar arasındaki boşluk oranı (VMA) ve Marshall katsayısı üzerindeki etkileri değerlendirilmiştir. Agrega dane boyutunun ortalama gradasyona kıyasla artmasının veya azalmasının Dp ve Vf değerlerinde azalma, VMA ve Vh değerlerinde artış meydana getirdiği belirlenmiştir. Bununla birlikte, gradasyon zarfının üst limitine doğru stabilite değerlerinin arttığı görülmüştür.

Keywords

Binder tabakası, Agrega gradasyonu, Marshall tasarımı, Marshall parametreleri

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