China
Africa
Explore chapters and articles related to this topic
Research on ice-melting technology of high elasticity pavement surface
Published in Sandra Erkens, Xueyan Liu, Kumar Anupam, Yiqiu Tan, Functional Pavement Design, 2016
Lei Wang, Mingxin Li, Xuancang Wang, Xiaowen Sun
In seasonal frozen inland areas, winter can be both cold and dry while last a long period. The snow and ice on pavement surface are not easily melted. It is prone to traffic accidents. There is an approach, that makes crumb rubber granular as part of fine aggregates in asphalt mixture, to build safer pavement with better deicing property. The crumb rubber granular is produced from waste rubber tires and grinded into particular shapes and sizes. Rubber particles in the asphalt mixture will effectively improve the elastic deformation capacity of the pavement (Shimomura, et al., 2009). As a consequence, the repeat loads of traffic can effectively suppress the accumulation of snow or formation of ice since adhesive condition between snow/ice and pavement is changed.
Solid Waste Source Reduction and Recycling
Published in Charles R. Rhyner, Leander J. Schwartz, Robert B. Wenger, Mary G. Kohrell, Waste Management and Resource Recovery, 2017
Charles R. Rhyner, Leander J. Schwartz, Robert B. Wenger, Mary G. Kohrell
Crumb rubber is a form of shredded tires in which the particles are small enough to be reused in molded or mixed products. It can be produced by using two very distinct methods, a cryogenic process or an ambient (room temperature) grinding process. In the cryogenic process, the pieces resulting from secondary shredding (i.e., about 0.6 cm or less) are frozen with liquid nitrogen, then ground to a smaller size, while ambient grinding is done at room temperature. Each year about 2.3 million tires are converted to crumb rubber for use in rubber and plastic products (Pillsbury, 1991). Uses for crumb rubber include molded rubber products, athletic surfaces, and rubberized asphalt.
Energy efficient masonry units using sustainable techniques
Published in Alphose Zingoni, Insights and Innovations in Structural Engineering, Mechanics and Computation, 2016
A.A. Gheni, M.E. ElGawady, J.J. Myers
Historically, crumb rubber has been used in the construction field in pavement. Arizona Department of Transportation started a project to use crumb rubber as a part of concrete pavement in 2001. They used 35 Kg of crumb rubber for each cubic meter of pavement. They obtained a compressive strength of 22.5 MPa in one year (Carder and Construction, 2004). A wide range of research has been devoted to investigating the impact of adding crumb rubber to different types of concrete. A clear reduction was noted in the unit weight of rubberized concrete as a result of the rubber particle’s low specific gravity and increased conjugated air contents. Rubberized concrete provided sound and heat insulation, a higher sound absorption, a higher noise reduction coefficient, and lower heat transfer properties, according to reports (Sukontasukkul, 2009, Turgut and Yesilata, 2008, Hall et al., 2012). Both load-bearing and lightweight rubberized masonry hollow blocks can be produced to meet the standard using rubberized concrete (Isler, 2012, Sadek and El-Attar, 2015). Mohammed et al. (2012) reported an improvement in thermal, acoustic, and electrical properties compared to the conventional masonry blocks. Fadiel et al. (2014) tried to improve the thermal resistance of concrete mixtures by investigating the optimum crumb rubber replacement ratio that would give the least thermal conductivity. They noted that the size and amount of crumb rubber influenced the concrete thermal properties. Al-Jabri et al. (2005) reviewed the attempts to use by-prod-uct materials (vermiculite and polystyrene beads) to improve the thermal insulation properties. They compared the thermal insulation of three types of concrete blocks. They noted that polystyrene beads improved the thermal insulation of the blocks when it was used as lightweight aggregate.
Performance of crumb rubber bitumen and asphalt modified in the wet process alone and in combination with SBS polymer
Published in Road Materials and Pavement Design, 2023
Ovidijus Šernas, Audrius Vaitkus, Judita Škulteckė
Polymer-modified bitumen is the most expensive component of the asphalt mixture, on which properties depend mainly on the performance of the asphalt pavement. To design sustainable and economical asphalt pavements, scientists are searching for alternative bitumen modification materials or design solutions. Studies have shown that one of the most suitable fields to use crumb rubber is road pavements because tyres comprise polymeric components that are beneficial for bitumen or asphalt mixture modification (Gawdzik et al., 2020; Hossain et al., 2016; Izaks et al., 2022; Poulikakos et al., 2022; Riekstins, Haritonovs, et al., 2021; Subhy et al., 2022). Scientists figured out that crumb rubber for bitumen modification enhances low- and high-temperature properties such as the Fraass breaking point, non-recoverable creep compliance, complex modulus and softening point and the modification effect increases with more crumb rubbers. However, the storage stability of crumb rubber-modified bitumen is determined and modified bitumen should be used soon after the modification process (Celauro et al., 2012; Ghavibazoo et al., 2013; Hossain et al., 2016; Izaks et al., 2022; Liang et al., 2015; Mandal et al., 2016; Riekstins, Baumanis, et al., 2021; Subhy et al., 2016; Wu et al., 2015).
Effect of low dosage crumbed rubber on the mechanical properties of a dense graded asphalt mixture
Published in Road Materials and Pavement Design, 2022
G. White, A. Kidd, T. Shadforth
The use of crumb rubber from the processing of end-of-life used vehicle tyres to modify asphalt binder and mixtures was first introduced in 1960s (Picado-Santos et al., 2020). As well as reusing old tyres that are otherwise sent to landfill, crumb rubber also has the potential to improve asphalt mixture properties, which can result in better performing road and other pavement surfaces (Chavez et al., 2019). For example, crumb rubber has been shown to improve the cracking resistance of asphalt mixtures and sprayed seals (Bressi et al., 2019). It has also been shown to improve asphalt mixture deformation resistance (Chavez et al., 2019). The asphalt mixture property improvement associated with crumb rubber is comparable to that associated with conventional synthesised polymers for asphalt binder modification (Bahia et al., 2012).
Can crumb rubber modifier effectively replace the use of polymer- modified bitumen in asphalt mixture?
Published in Sustainable and Resilient Infrastructure, 2022
Lily D. Poulikakos, William Buttlar, Nicolas Schüwer, Davide Lo Presti, Tobias Balmer, Moises Bueno
Use of crumb rubber can contribute significantly to sustainability of road transport. Resulting in long-term performance of the built environment as well as preservation of natural resources. It has been reported that CR modified asphalt is a viable sustainable resource use. (Feraldi et al., 2013) have investigated through an LCA approach the potential environmental impacts from shifting all US scrap tire to the material recycling treatment route. The analysis was done by comparing energy recovery by cement kiln to material recovery through ambient temperature mechanical granulation used in asphalt mixtures using the wet process. The results show that shifting scrap tires from energy recovery methods to material recycling methods results in significant potential environmental benefits in terms of waste management hierarchy. Likewise, this study assesses how CRMAs could contribute to an effective climate change mitigation path considering the whole life cycle. During the mixing process of CR with hot bitumen volatile organic compounds (VOC) are released at a lower amount than SBS modification. The works cited in this study focused on the wet process and highlighted that using a certain type of CR that is mechanically produced with added plasticizer, for use in asphalt, 75% less energy and 30% less VOCs are upon application produced (Feraldi et al., 2013).