12/16/2023 0 Comments Crm crumb rubber![]() ![]() For example, Uygunoğlu and Topçu (2010) investigated the influence of scrap rubber with five different replacement ratios on the flowability, apparent porosity, water absorption by weight, compressive and flexural strength, and dynamic modulus of elasticity of mortar. Scholars worldwide have conducted substantial experimental research on the mechanical properties of crumb rubber mortar (CRM). These researches found that the rubberized cement-based materials, with the addition of rubber particles, have the advantages of low density, good sound absorption, high acid resistance, well freeze-thaw resistance, fine chloride permeability resistance, increased damping capacity, and great bending impact strength and toughness ( Li et al., 2019). Consequently, numerous studies focusing on the material properties of rubberized cement-based materials have been undertaken ( Li et al., 2019 Strukar et al., 2019 Roychand et al., 2020 Xu et al., 2020). ![]() Thus, using waste tire rubber in mortar or concrete will be a very helpful method to substitute the traditional natural aggregate or cement ( Karakurt, 2015). On the other hand, the industry of civil engineering has been experiencing increasing scarcity of natural construction materials ( Li et al., 2018). Therefore, the disposal of waste tires has been a major problem for countries around the world ( Roychand et al., 2020). However, only 40% of those scrap tires were recycled or properly managed, leaving the rest larger part disposed of landfills without proper management, which leads to other problems such as landfilling, health, and environmental challenges ( Strukar et al., 2019) since scrap vehicle tires are difficult to be degraded under natural conditions. In 2018, according to the China Rubber Industry Association, 379.8 million scrap vehicle tires with a total weight of 14,590 kt were generated in China. Similar to that in the static compressive test, the addition of crumb rubber has a positive effect in enhancing the deformation and energy absorption properties under dynamic impact loading.Ĭhina’s rapid development in transportation prompts the generation of a large number of scrap vehicle tires every year. When the incorporated rubber contents remained constant, the CRM increased its dynamic compressive strength and dynamic increase factor with the increase of strain rates. The CRM also showed an obvious strain rate effect. ![]() The CRM, when the incorporating crumb rubber increased in the mortar, presented a decrease in its static compressive strength and modulus of elasticity, but an increase in its critical strain and compressive toughness. The result shows that the fluidity of CRM decreases obviously with the addition of crumb rubber and the increase of fine particle rubber size. In this paper, the CRM specimens containing four different contents of crumb rubber (5, 10, 15, 20%) and four different rubber particle sizes (0.595, 0.297, 0.250, 0.177 mm) were prepared to study the workability of fresh CRM and the stress-strain curve of hardened CRM under static compression and dynamic compression. To develop it, a systematic study of the stress-strain behavior of CRM under static and dynamic compression is therefore very important. 5School of Civil Engineering, Guangzhou University, Guangzhou, ChinaĬrumb rubber mortar (CRM) made from scrap tires can be used in highway, high-speed railways, and airport pavements as a structural material, which may help to solve the problems of raw material shortage and waste tire pollution at the same time.4School of Civil Engineering, South China University of Technology, Guangzhou, China.3School of Civil Engineering, Nanjing Forestry University, Nanjing, China.2Research Institute of Highway Ministry of Transport, Beijing, China.1Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai, China.Manjuan Yang 1,2 Zhongyin Guo 1 Wenhua Zhang 3 * Guangming Chen 4 Liwen Zhang 5 ![]()
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