Abstract
Crumb 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 solving the problems of raw material shortage and waste tire pollution at the same time. To develop it, a systematic study of the stress-strain behavior of CRM under static and dynamic compression is therefore very important. In this paper, the CRM specimens containing four different contents of crumb rubber (5%, 10%, 15%, 20%) and four different rubber particle sizes (30 mesh and 50 mesh, 60 mesh, 80 mesh) were prepared to study the workability of fresh CRM and the stress-strain curve of hardened CRM under static compression and dynamic compression. The result shows that the fluidity of CRM decreases obviously with the addition of crumb rubber and the increase of fine particle rubber size. 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 CRM also showed an obvious strain rate effect. When the incorporated rubber contents remained constant, the CRM increased its dynamic compressive strength and DIF with the increase of strain rates. 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.
Highlights
China’s rapid development in transportation prompts the generation of a large number of scrap vehicle tires every year
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
The decreased flowability of rubber powder mortar is due to the rough rubber particles, which result in increasing the friction forces between the rubber particles and the other components of the mix
Summary
China’s rapid development in transportation prompts the generation of a large number of scrap vehicle tires every year. Uygunoglu 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. The influence of crumb rubber content and particle size on the static and dynamic compressive properties of CRM were studied. Four different crumb rubber particle sizes including 0.595 mm (30 mesh), 0.297 mm (50 mesh), 0.250 mm (60 mesh), and 0.177 mm (80 mesh) were used, crumb rubber replaced 10% of the sand volume Those four CRMs were shortened for R30–10, R50–10, R60–10, R80–10, respectively. Since the smoothness of both ends of the specimen has a significant influence on the test result, the specimen was polished before the test by a high-precision grinder to ensure that the specimen had a roughness less than 20 μm in both ends
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