Road Materials and Pavement Design Changes in Rubber Due to its Interaction with Bitumen when Producing Asphalt Rubber (original) (raw)
Related papers
Evaluation of the Effect of Rubber Modified Bitumen on Asphalt Performance
American Journal of Civil Engineering, 2018
For over a century, paved roadways have been constructed using asphalt concrete mixes across the world. This research was aimed on evaluation of the effect of the waste rubber tire modified bitumen on Asphalt performance, to investigate physical properties such as the stability and flow. Marshall Stability Method was used to determine the Optimum Binder Content (OBC) and to evaluate the properties of the crumb rubber. Five different percentage of rubber by weight of bitumen: 0%, 5%, 10%, 15%, 20% were used. A comparative study is made among the unmodified and modified bitumen samples using the various sizes of waste rubber tire bitumen particles and the modified. The results of the study revealed that as rubber content increase from 0 to 20% penetration decreased from 68.5 to 58.5 mm. Similarly, for the same percentage increase in rubber content ductility decrease from 100 to 75 cm. Asphalt mixes with crumb rubber 15% have higher stability, it is two times more than the minimum specification and lower marshal flow. From this study it is concluded that recycled crumb rubber can therefore be beneficial to the performance of the asphalt concrete pavements as well as provide a means of safe disposal of these non-biodegradable wastes.
Rheological and functional evaluation of the interactions between bitumen and rubber
Advanced Testing and Characterization of Bituminous Materials, 2009
It is estimated that about ten kilograms of tires are discarded per inhabitant annually. The negative impact of this residue can be reduced, since rubber can be reused as a constituent of asphalt rubber (AR) binder in road pavements. However, the materials which constitute the AR binders and their interaction are not sufficiently characterized. In this work several base bitumens interacted with crumb rubber, in order to produce AR binders, which were subsequently separated, by using a modified "Basket drainage method" to recover the residual bitumen and rubber. EN 12591 or 14023 standards tests and the Dynamic Shear Rheometer (DSR) were used to evaluate the changes in the properties of the binders during AR production. The swelling and depolymerisation changes in the rubber were evaluated through microscopic tests. It was observed that the characteristics of the base bitumen significantly affect the rubber and the AR binder properties (mainly for interactions with softer bitumens).
The use of rubber granulate in bitumen and asphalt
Proceedings of 6th Eurasphalt & Eurobitume Congress, 2016
Crumb rubber can be used as a high quality additive for bitumen and thus provides another way of bitumen modification. Consequently, crumb rubber modified bitumen (CRMB) can be an alternative to polymer modified bitumen (PMB). Rubber granulates are made of old truck tires. The recycling of the tires is meant to achieve a CO2 reduction [Manke et. al, 2013]. Furthermore, the sustainability will be improved by preserving the natural resources. Of course, the protection of the environment is not the only reason for the use of CRMB in asphalt. The concrete advantage of rubber modified bitumen is that its rheological properties are improved as well as the mechanical properties of asphalt. In the present examination report the bitumen products as well as the final asphalt are examined. The comparison between two products of crumb rubber modified bitumen with one product of polymer modified bitumen shows that rubber modified bitumen is absolutely equivalent to polymer modified bitumen and thus indeed suitable for binder modification as well. Cold temperature tests reveal a similar performance of CRMB in comparison to PMB. Testing final asphalt samples, those samples produced with PMB have a comparable low-temperature behaviour as samples produced with CRMB. Generally it has to be pointed out that the influence on the bitumen varies depending on the producer.
Comparison between bitumen modified with crumb tyre rubber and styrene butadiene styrene
Historically, recycled rubber from tyre waste has been used in asphalt mixtures using two approaches, namely the wet process and the dry process. The wet process involves dispersing the rubber particles (known as crumb rubber modifier) in the bitumen to produce rubberised bitumen, which is then mixed with aggregate to form a mixture. In the dry process, on the other hand, the recycled rubber is mixed with the aggregates before introducing the binder to the mixture, i.e. rubber particles act as a partial replacement for some of the aggregate sizes. In the wet process, finely ground crumb rubber is blended with bitumen at an elevated temperature (170 to 200°C) generally in the presence of an oil extender. The interaction of bitumen with rubber in the wet process is known to be affected by the blending temperature, the duration of blending, the type and amount of mechanical blending energy, the size and texture of the rubber particles, and the aromatic component of the bitumen. The absorption of aromatic oils from the bitumen into the rubber's polymer chains causes the rubber to swell and soften. The type and amount of aromatic oil in the bitumen also plays a major role in determining the compatibility of bitumenrubber blends .
2024
The incorporation of waste tire rubber into asphalt binders has emerged as a promising method to improve the properties and performance of bituminous road mixes. This study examines the effects of varying crumb rubber contents and blending temperatures on the engineering characteristics of VG 30 grade bitumen. Bitumen was modified with 5%, 10%, 15%, 20%, and 25% crumb rubber using the wet process at temperatures of 175 °C, 200 °C, and 225 °C. Comprehensive testing, including penetration, softening point, ductility, viscosity, and Marshall stability, was conducted to assess the performance of the modified binders. Results indicate that increasing crumb rubber content led to a reduction in penetration and an increase in softening point, reflecting a stiffer binder. Additionally, Marshall stability values improved, suggesting enhanced load-bearing capacity of crumb rubber-modified bituminous mixtures. These findings highlight the potential benefits of using crumb rubber in asphalt binders for road construction applications.
Laboratory Analysis of Crumb Rubber Mixed With Bitumen on Asphalt Road
India has a wide road network of more than 3 million km is one of the largest in the world. For the development of Indian infrastructure and industrial growth the fast transportation is necessary as well as wide road network is also necessary. Due to fast transportation the vehicles used for transportation is increased due to this use of vehicles the wear and tear of tyres is occurring. For high use of tyres it becomes useless and discarded. These useless tyres are disposed by burning or landfilling, due to these processes the burning causes the environmental pollution and landfill causes the valuable land wastages. To avoid or minimizes this pollution the new method is to be used to recycles this tyres and to overcome this problem. So the use of waste tyre rubber mixed with bitumen and enhances the properties of bitumen as well as achieving the economy in bitumen.
Evaluation of the performance of rubber-modified bitumen
2018
The paper discusses the effect of the amount and particle size of rubber on the properties of rubber-modified<br> bitumen. Therefore, rubber-modified bitumen with rubber contents of 10, 15 and 20 % and a variation of the<br> particle size from small (0.4 mm) to middle (0.8 mm) and up to big (1.0 mm) were prepared in laboratory by using<br> a paving bitumen 50/70 as reference bitumen. Additionally, a polymer-modified bitumen (PmB 25/55-55), which<br> is commonly used in asphalt wearing and binder courses, was involved in the investigations to verify the<br> modification states. Different laboratory tests were conducted to evaluate the influence of the selected rubber<br> particles. At first, the impact of the rubber modifications on conventional bitumen tests are presented. Furthermore,<br> DSR tests were conducted to determine performance related bitumen properties. DSR results have also been used<br> to determine the rutting susceptib...
Sustainability, 2022
The diminution of natural resource exploration, the retrieval of waste, and the structural modification of polymers by additives are the main contributions to sustainable development. The properties of bitumen are enhanced by the crumb rubber through effective bitumen modification techniques, which have environmental and economic advantages. In this study, plastic waste, plastic-coated aggregate (PCA), and bitumen were blended in order to enhance the engineering properties of the flexible pavement. In order to compute the composition of crumb rubber modified bitumen (CRMB), the adopted materials were subjected to the relevant experiments. PCA was a very effective material when compared to the standard bitumen road pavement. The recycling of waste crumb rubber and plastic was tested by adding them into the hot mix asphalt. The Marshall properties of standard (virgin) bituminous mix, CRMB grade 55, and plastic mix asphalt were studied in detail to explore the solutions for a sustainab...
Performance of asphalt mixtures with a new type of rubber modified bitumen
Facta universitatis - series: Architecture and Civil Engineering, 2021
The rubber modified bitumen 45/80-55 (RMB 45/80-55) product has been used in Hungary as bituminous binder for asphalt mix production since 2013. It is a new kind of rubber bitumen manufactured using patented technology. Over the past 8 years, it has been used to construct or renovate more than 100 asphalt road sections. Originally RMB 45/80-55 was used to replace paving grade bitumen 50/70 in some road construction projects. However, asphalt laboratory results and road construction experience showed that its quality can also achieve or in terms of some parameters exceed that of asphalt mixtures manufactured with polymer modified bitumen 25/55-65 (PMB 25/55-65). Primarily, its excellent resistance to low temperatures and fatigue are outstanding, in this respect; it surpasses the results of asphalts made with polymer modified bitumen. Its favourable fatigue resistance compensates for its lower stiffness; therefore, favourable results were obtained in the case of track structure design...