Evaluation of the thermal conductivities of asphalt mixtures

Year 2022, Volume: 11 Issue: 2, 348 - 355, 15.04.2022

Nurgül Şirin , Erol İskender , Atakan Aksoy , Mustafa Taha Aslan , Cansu İskender

https://doi.org/10.28948/ngumuh.1049283

Abstract

In the article, thermal conductivity of asphalt mixtures was investigated depending on aggregate type, aggregate gradation, maximum aggregate size, mixture type and commonly used asphalt additives. By using basalt and limestone aggregates, dense graded and gap graded asphalt mixture designs were made with 19 mm and 12.5 mm maximum sized aggregates in different gradations. In addition to control (K) bituminous mixtures using basalt and limestone aggregates, rubber (R), cellulosic fiber (SE), Styrene-Butadiene-Styrene (SBS), Styrene Isoprene Styrene (SIS), Elvaloy (E), Styrene-Ethylene- Butylene-Styrene (SEBS), polyolefin elastomer (PE) and nanoclay (NC) modified asphalt mixtures were produced. It was observed that the thermal conductivity of the mixtures was significantly affected by the aggregate gradation, the increase in the fine aggregate ratio increased the thermal conductivity of the mixture, and the thermal conductivity of the dense graded mixtures was higher than the stone mastic asphalts. The effect of maximum aggregate size was not clearly understood in the gradations created. All of the additives used decreased the thermal conductivity, and the highest decrease was observed in SE and R modified mixtures. The thermal conductivity of the mixtures using limestone aggregate instead of basalt aggregate decreased.

Keywords

Thermal conductivity, Cellulose fiber, Polymer, Rubber, Nanoclay, Aggregate gradation, Aggregate type, Maximum aggregate size

Asfalt karışımların termal iletkenliklerinin değerlendirilmesi

Abstract

Makalede asfalt karışımların termal iletkenlikleri agrega cinsi, agrega gradasyonu, maksimum agrega boyutu, karışım türü ve yaygın kullanılan asfalt katkı maddelerine bağlı olarak araştırılmıştır. Bazalt ve kireç taşı agregası kullanılarak 19 mm ve 12.5 mm maksimum boyutlu agregalarla farklı gradasyonlarda yoğun gradasyonlu ve kesikli gradasyonlu karışım tasarımları yapılmıştır. Bazalt ve kireç taşı agregaları kullanılarak kontrol (K) bitümlü karışımlara ilave olarak kauçuk (R), selülozik elyaf (SE), Stiren-Bütadien-Stiren (SBS), Styrene Isoprene Styrene (SIS), Elvaloy (E), Stiren-Etilen-Butilen-Stiren (SEBS), poliolefin elastomer (PE) ve nanokil (NC) modifiye asfalt karışımlar üretilmiştir. Karışımların termal iletkenliklerinin agrega gradasyonundan önemli ölçüde etkilendiği, ince agrega oranının artmasının karışımın termal iletkenliğini artırdığı, yoğun gradasyonlu karışımların termal iletkenliğinin taş mastik asfaltlardan daha yüksek olduğu görülmüştür. Maksimum agrega boyutunun etkisi oluşturulan gradasyonlarda açık olarak anlaşılamamıştır. Kullanılan katkı maddelerinin tamamı termal iletkenliği azaltmış, en yüksek azalma SE ve R modifiye karışımlarda görülmüştür. Bazalt agregası yerine kireç taşı agregası kullanılan karışımların termal iletkenlikleri azalmıştır.

Keywords

Termal iletkenlik, selüloz elyaf Polimer, Kauçuk, Nanokil, Agrega gradasyonu, Agrega türü, Maksimum agrega boyutu

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