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Effects of Amine and Silane Antistripping Agents on Rheological Behavior of Crumb Rubber Modified Binder at High and Low Temperature

This study focused on evaluating the effect of amine and silane antistripping agents on the rheological behavior of crumb rubber modified binder (CRMB60). In accordance with the manufacturer’s recommendation, 0.5 % and 0.1 % of amine and silane agents (by weight), respectively, were added to CRMB60. The effect of amine and silane antistripping agents on CRMB60 was studied by using various rheological tests. Amine reduced and silane caused a significant rise in the high failure temperature. However, both the antistrips raised the low failure temperature. All the tested binders (without and with antistripping agents) exhibited thermorheological complexity. Complex modulus (G*) master curves indicated that amine decreased and silane enhanced the elastic behavior of CRMB60 in high-temperature regime. Creep stiffness master curves depicted an increased stiffness at low temperature for silane modified CRMB60. Further, the stress relaxation master curve indicated that both amine and silane antistripping agents compromise the relaxation properties at low temperatures. Fourier transform infrared spectroscopy revealed that amine and silane antistripping agents can cause chemical changes in CRMB60. Overall, this study concluded that the antistripping agents affect the rheological behavior of CRMB60 and that detailed rheological investigation should be conducted prior to adopting an antistripping agent.