硅藻土复合木质纤维改性沥青性能研究

硅藻土复合木质纤维是经特定表面处理工艺处理后的硅藻土与木质纤维在高剪切条件下制备而成的一种复合材料.将硅藻土复合木质纤维用于改性道路沥青,进行了改性沥青高温性能、低温性能和感温性能3个方面的实验研究,考察了二者协同作用对沥青性能影响.结果表明:改性后,沥青的高温性能、低温性能和感温性能显著改善,且硅藻土复合木质纤维掺量为0.5%时,沥青性能改善效果最佳,与基质沥青相比针入度指数增加了2.43,当量软化点提高了7.7℃,当量脆点降低了16.8℃.

Research on Performance of the Modified Asphalt by Diatomite-Cellulose Composite Fiber

The diatomite-cellulose composite fiber (DCCF) is made from diatomite and cellulose fibers and prepared via specific surface treatment under high shearing conditions. The DCCF was used to modify the asphalt for pavement, then the high/low-temperature performance and temperature susceptibility of the modified asphalt were investigated experimentally. The results showed that these performances of the DCCF-modified asphalt are all improved obviously and will be the best if the modifier dosage is 0.5%. After the modification the penetration index increases by 2.43, the equivalent softening point increases by 7.7°C and the equivalent brittle point decreases by 16.8°C in comparison to the asphalt matrix without modification.