Abstract
Crumb rubber modified bitumen (CRMB) has been widely used in pavement construction and provides an effective way to recycle waste tires and helps alleviate the “black pollution” problem. There are no current specifications regarding the appropriate mixing and compaction temperatures of the CRMB mixture. There is a direct relationship between the mixing and the compaction temperatures of the CRMB mixture and the viscosity of the CRMB mastic. In this study, we first prepared CRMB using crumb rubber powder and penetration grade 70 neat bitumen, then prepared the CRMB mastic using CRMB and fillers (limestone mineral powder and cement). Finally, we used the CRMB mastic and aggregate to make mixture specimens. The best air void of the specimens was subsequently used to demarcate the viscosity of the CRMB mastic, and the construction temperatures (including the mixing temperature and the compaction temperature) were calculated based on the viscosity of the CRMB mastic from the viscosity–temperature curves. Test results indicated that the best viscosity of the CRMB mastic was 2.7 ± 0.2 Pa·s and 3.9 ± 0.3 Pa·s that corresponded to the mixing and compaction temperatures, respectively.
Highlights
Increasing attention has been paid to modified bitumen and modified bitumen mixture over time.Pavement materials require a higher quantity of bitumen mastic because of the higher volume of traffic, load, and dynamic water pressure they are exposed to
The present study used crumb rubber modified bitumen (CRMB) binder and CRMB mastic to compare the accuracy of determination The present study used CRMB binder and CRMB mastic to compare the accuracy of based on viscosity
Four groups of the CRMB binder were tested based on the different ratios described previously and the viscosity–temperature curves were calculated with the Saal formula (Equation (1)) from the and the viscosity–temperature curves were calculated with the Saal formula (Equation (1)) from the ASTM D2493 standard: Lglg (η ×(η1000)
Summary
Increasing attention has been paid to modified bitumen and modified bitumen mixture over time. Wu Yuhui used a dynamic shear rheometer (DSR) and a bending beam rheometer (BBR) to study the effect of mineral powder content on the high- and low-temperature performance of penetration grade 90 neat bitumen mastic [5]. Cai Jun et al [16] used the air void to determine the construction temperatures of warm mix rubber bitumen mixtures. Studying the determination of the construction temperatures of the CRMB mixture based on the viscosity of the CRMB mastic is required. The viscosity of the CRMB mastic was used to determine the construction temperatures of the CRMB mixture, and the temperatures were verified by the air void of the CRMB mixture
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