Gong Yafeng, Wu Shuzheng, Zhang Yuwei, Pang Yunze, Ma Yulin
College of Transportation, Jilin University, Changchun 130025, China.
Polymers (Basel). 2022 Jun 23;14(13):2558. doi: 10.3390/polym14132558.
Crack sealing is an important measure for pavement maintenance. Hot-poured crack sealant is the most utilized material for crack sealing. However, its poor high-temperature and rheological properties seriously weaken the mechanical properties of repaired pavement. Thus, to overcome the disadvantage of the poor high-temperature and rheological properties of sealant, styrene-butadiene-styrene (SBS) and rubber crumb (CR) were utilized for modifying the asphalt-based sealants. Softening point tests, temperature tests, frequency scan tests, and multiple stress creep recovery tests (MSCR) were conducted to evaluate the high-temperature and rheological properties of the modified sealant. Additionally, the influence of SBS and CR on the high-temperature performance of the modified sealant was quantitatively analyzed by the grey relational analysis method. The results reveal that the SBS has a greater enhancement effect on the high-temperature performance of sealant than CR. Increasing the SBS and CR content in the sealant could enhance the sealant's high-temperature performance, stiffness, and elasticity. Compared with asphalt-based sealant and one-component modified asphalt-based sealant, SBS/CR-modified asphalt sealant has greater viscosity and higher temperature deformation resistance. Additionally, SBS can increase the stress level of the sealant, thereby enhancing the resistance of the sealant to permanent deformation.
灌缝是路面养护的一项重要措施。热灌缝胶是灌缝最常用的材料。然而，其较差的高温性能和流变性能严重削弱了修复后路面的力学性能。因此，为克服灌缝胶高温性能和流变性能差的缺点，采用苯乙烯-丁二烯-苯乙烯（SBS）和橡胶粉（CR）对沥青基灌缝胶进行改性。通过软化点试验、温度试验、频率扫描试验和多重应力蠕变恢复试验（MSCR）来评价改性灌缝胶的高温性能和流变性能。此外，采用灰色关联分析法定量分析了SBS和CR对改性灌缝胶高温性能的影响。结果表明，SBS对灌缝胶高温性能的增强作用比CR更大。增加灌缝胶中SBS和CR的含量可提高灌缝胶的高温性能、刚度和弹性。与沥青基灌缝胶和单组分改性沥青基灌缝胶相比，SBS/CR改性沥青灌缝胶具有更大的粘度和更高的抗温度变形能力。此外，SBS可提高灌缝胶的应力水平，从而增强灌缝胶抵抗永久变形的能力。
