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

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


Effect of support material in nox storage/reduction catalysts
Hummatov, Ruslan; Toffoli, Hande; Toffoli, Daniele; Department of Physics (2010)
Energy need in transportation and industry is mainly met by fossil fuels. This causes consumption of resources and some environmental problems. Diesel and gasoline engines are developed to consume fuel efficiently in vehicles. Since these engines work in a low fuel to air ratio, it becomes difficult to reduce nitrogen oxide emission. For this reason NO x storage/reduction (NSR) catalysts have been developed. While engines are operating under lean conditions alkaline or alkaline-earth component of NSR cataly...
Effects of hemicellulose extraction and extrusion parameters on the properties of hemicellulose based polymeric materials obtained from different lignocellulosic biomass
Erdemir, Duygu; Bölükbaşı, Ufuk; Özkan, Necati; Department of Chemical Engineering (2015)
There is growing interest worldwide in utilization of renewable sources for fuels, materials and chemicals due to depletion of fossil sources and the environmental damages of synthetic products. Lignocellulosic biomass is the most promising material to become a substitute for fossil sources because of its abundancy in nature, low price and utilization area which does not compete with the food. Biodegradable films can be produced from hemicellulosic part of biomass and their main use can be especially food p...
Effect of warm mix additives on compactabilitiy of mixtures
Pamuk, Ömer Can; Öztürk, Hande Işık; Department of Civil Engineering (2019)
Warm Mix Asphalt (WMA), the technology that allows significant reduction in the mixing and compaction temperatures of asphalt mixtures, has been commonly used globally since the early 2000s. This study evaluates the effect of compaction temperature (CT) on WMA and Hot Mix Asphalt (HMA) mixtures volumetrics, degradation, stability, and compactability properties. Although both Superpave Gyratory Compactor (SPGC) and Marshall hammer are used for sample preparation, the focus of this study is to develop compact...
Dry process crumb rubber modification in warm mix asphalt
Kamran, Farshad; Öztürk, Hande Işık; Department of Civil Engineering (2018)
Since the last decade, environmentally friendly asphalt production techniques have significantly advanced for savings in natural resources, energy and economy. From these techniques, Warm Mix Asphalt (WMA) provides a reduction in mixing and compaction temperatures and also overcomes various challenges of Hot Mix Asphalt (HMA). Additionally, Crumb rubber (CR) modification of asphalt mixtures helps the disposal of waste tires and also improves the asphalt mixtures properties. Among CR modification methods, dr...
Effect of ozone pretreatment on methane production and microbial community structure of single-stage anaerobic digesters
Tuncay, Sera; İçgen, Bülent; Department of Environmental Engineering (2021-2-09)
Increasing amount of sludge produced by wastewater treatment plants poses many problems in environmental, public health and economic aspects. Anaerobic digestion (AD), the most common sludge stabilization method, is used to reveal energy potential of sludge as methane-rich biogas. Various pretreatment methods are applied to enhance AD efficiency by facilitating the rate limiting hydrolysis step. Ozone pretreatment is a remarkable method for improving methane production, sludge reduction and pathogen removal...
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.