| XIE Juan,CHEN Xue-ru,LUO Hao-chen,ZHAO Xu-cheng,HE Wen.Effect of Different Activation Methods on Adhesion Performance of Rubber Asphalt-aggregate[J],52(9):322-330 |
| Effect of Different Activation Methods on Adhesion Performance of Rubber Asphalt-aggregate |
| Received:July 29, 2022 Revised:January 06, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.028 |
| KeyWord:activation method surface energy theory adhesion work adhesion FTIR boiling method |
| Author | Institution |
| XIE Juan |
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha , China |
| CHEN Xue-ru |
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha , China |
| LUO Hao-chen |
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha , China |
| ZHAO Xu-cheng |
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha , China |
| HE Wen |
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha , China |
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| Abstract: |
| Activated rubber powder modified asphalt can not only mitigate environmental pollution issues caused by waste rubber tire, but also ensure superior pavement performance. Currently, research works related to adhesion between activated rubber powder modified asphalt and aggregate are relatively limited. The weak adhesion between aggregate and asphalt is the main reason of asphalt pavement water damage. In order to promote the engineering application of rubber powder modified asphalt, the work aims to study the effect of adhesion of rubber asphalt with different activation methods based on the surface energy theory and assess the adsorption mode between rubber asphalt and aggregate. Firstly, the rubber powder was pretreated by two activation methods, namely grafting activation and coating activation. The affecting reasons of rubber asphalt adhesion performance after activation pretreatment of rubber powder were analyzed. Furthermore, the contact angle test, surface energy theory, and boiling test were conducted to comprehensively evaluate the contact angle, surface free energy (SFE), adhesion work, spalling work, energy ratio (ER), and adhesion grade. Additionally, the adsorption mode and adhesion mechanism between rubber asphalt and aggregate were evaluated by Fourier transform infrared spectroscopy (FTIR). The results showed that the water contact angles of Crumb Rubber Modified Asphalt (CRMA), Coating Activated Crumb Rubber Modified Asphalt (AC-CRMA) and Grafting Activated Crumb Rubber Modified Asphalt (AM-CRMA) were 105.31°, 103.88° and 99.45°, respectively. The SFE of CRMA, AC-CRMA, and AM-CRMA were 13.28 mJ/m2, 13.79 mJ/m2, and 15.77 mJ/m2 respectively, indicating that rubber powder with the process of activation pretreatment could promote the cohesion force of rubber asphalt. Accordingly, the adhesion work values related to CRMA, AC-CRMA, and AM-CRMA were 54.11 mJ/m2, 55.03 mJ/m2, and 58.27 mJ/m2, respectively. In the case of peeling work, the values were 7.68 mJ/m2, 7.52 mJ/m2 and 6.99 mJ/m2, respectively. Compared to the ER of CRMA, the ER of AC-CRMA and AM-CRMA increased by 4.0% and 18.5%, respectively, while the ER of AM-CRMA increased by 13.9% compared with that of AC-CRMA. The boiling test showed that the adhesion grade of CRMA was 4, while the adhesion grades of AM-CRMA and AC-CRMA were in both cases equal to 5. Activation could increase the specific surface area of rubber powder, and enabled rubber powder to better develop and swell in the matrix asphalt. This fact made the rubber powder crosslink to form a stable three-dimensional network structure, so the more stable rubber asphalt was obtained. After activation treatment, the rubber powder absorbed more light components of the matrix asphalt, which could improve the viscosity of the rubber asphalt. At the same time, it also absorbed part of paraffin which had bad effect on the adhesion of rubber asphalt. Overall, activation pretreatment of rubber powder could effectively improve the adhesion of rubber asphalt, and grafting activation performed much better than coating activation in terms of adhesion performance of rubber asphalt. Moreover, the boiling method test in specification was simple and easy to observe, but it was greatly affected by human subjective factors and macroscopic factors, which was not conducive to obtaining more accurate division results. Finally, the FTIR results showed that the characteristic peaks of rubber asphalt and rubber asphalt-limestone mastics were consistent, indicating that physical adsorption was the main adsorption mode between rubber asphalt and aggregate. |
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