Laboratory Evaluation of Storage Stability for CRM Asphalt Binders




Yun, Jihyeon

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This study was performed to quantify storage stability depending on CRM binder content. The percentages of crumb rubber used for CRM binder were 0%, 5%, 10%, 15% and 20%. According to ASTM D7173, the CRM binder sample was prepared to pour into the vertically held aluminum tube. This tube was conditioned in a vertical position for 48 hours at a temperature of 163 ± 5°C and placed immediately in the freezer at –10 ± 10°C for at least 4 hours to completely solidify the sample. Finally, test specimens were arranged into three parts of approximately equal length. In order to evaluate the properties of each part of binders, tests were carried out through the rotational viscosity and viscoelasticity, and the separation index (SI) was assessed with the G*/sin δ and % rec. In general, the results of this study revealed that (1) the conditioned CRM binders are found to have higher viscosity in the bottom part compared to the middle and top parts, as expected; (2) similar to the viscosity results, the CRM binders after conditioning showed the highest G*/sin δ value in the bottom part; (3) the SI from G*/sin δ generally increased as the test temperature increased; (4) the SI increased up to 10% CRM, and then decreased as the CRM content was further increased; (5) the SI from G*/sin δ was suitable for evaluating the storage stability of CRM asphalt binders, compared to the SI from % rec.



CRM binder, Storage stability, Separation index, Viscosity, G*/sin δ


Yun, J. (2022). <i>Laboratory evaluation of storage stability for CRM asphalt binders</i> (Unpublished thesis). Texas State University, San Marcos, Texas.


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