Synthesis of tannic acid-terephthalyl chloride modified rubber powder for the fabrication of tannic acid-terephthalyl chloride-rubber/styrene-butadiene-styrene modified asphalt

Herein, tannic acid-terephthalyl chloride (TA-TPC) was prepared and was applied for the preparation of TA-TPC-Rubber to composite styrene butadiene styrene (SBS)-modified asphalt (SBSMA). Fourier transform infrared spectroscopy and scanning electron microscopy indicated that TA-TPC successfully attached to the surface of rubber powder (RP), which improved the bonding between RP and SBSMA. Fluorescence microscopy analysis showed that TA-TPC-Rubber formed a complete crosslinking network structure in SBSMA, while thermogravimetry analysis proved the higher thermal stability of TA-TPC-Rubber/SBSMA. Dynamic shear rheometer and multi-stress creep recovery tests confirmed that compared with SBSMA, the storage modulus (G') and loss modulus (G") of 12% TA-TPC-Rubber/SBSMA at 46°C were increased by 37.14% and 34.36%, respectively, the recovery rate was increased by 35.49% (0.1 kPa) and 31.91% (3.2 kPa) while the average creep compliance was decreased by 68.67% (0.1 kPa) and 59.87% (3.2 kPa). The phase segregation test proved that the compatibility between RP and SBSMA was improved by the modification of TA-TPC, and the difference between the upper and lower softening points were reduced by 53.85%. The findings of this study can be of great significance for designing modified asphalt from cost-effective raw materials through a convenient process for highways and construction applications.