Effect of Conditioning Time and Temperature on the Volumetrics and Stability of Dry Process Crumb Rubber Modified Warm Asphalt Mixtures

Date

2017-11-17

Author

Öztürk, Hande Işık

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Environmentally friendly techniques for asphalt mixtures are developed for greater savings in natural resources, energy and economy. This paper focuses on the association of: i) Warm Mix Asphalt (WMA) ii) Dry Process Crumb Rubber (DryCR). WMA is a widely used technology that allows significant reduction in the mixing temperature (MT) and compaction temperature (CT) of the asphalt mixtures. Additionally, they have various acknowledged engineering, environmental and economic benefits. Similarly, CR modification has several advantages such as improved cracking and rutting resistance, improved skid resistance, and decreased tire/pavement noise. This study focuses on DryCR because of high CR usage potential. Major advantages of DryCR are known as good skid resistance, de-icing properties and low cost. However, the major disadvantage of DryCR is the high production temperatures. The association of these methods can overcome the temperature demand. In this study, the test matrix involves a control mixture (DryCR modified Hot Mix Asphalt (HMA)) and three different DryCR modified WMA mixtures; prepared with non-foaming additive. Two of the WMA mixtures are prepared at two different additive dosages, 1.5% and 3% by the weight of the binder, respectively, at the same MT/CT of HMA. For the third WMA mix, MT/CT is reduced by 15°C. Moreover, the mixtures are conditioned for 0, 45, 90 and 120 min. to observe the effect of interaction time. Accordingly, the relation between volumetrics and stability is developed between the conditioning time and temperature.

URI

https://hdl.handle.net/11511/75877

Conference Name

18th World Road Meeting (14-17 Kasım 2017)

Collections

Department of Civil Engineering, Conference / Seminar

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Citation Formats

H. I. Öztürk, “Effect of Conditioning Time and Temperature on the Volumetrics and Stability of Dry Process Crumb Rubber Modified Warm Asphalt Mixtures,” presented at the 18th World Road Meeting (14-17 Kasım 2017), Delhi, India, 2017, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/75877.