Anti-cracking mechanism of diatomite asphalt and diatomite asphalt mixture at low temperature

作者：Tan Yiqiu^*; Shan Liyan; Fang Jun; Zhang Xingyou

来源：Journal of Southeast University (english Edition), 2009, 25(1): 74-78.

• Anti-cracking mechanism
• Asphalt mixtures
• Contraction coefficients
• Critical bending
• Diatomite asphalt
• Glass transition temperature
• Low temperature performance
• Low temperatures
• Specimen tests
• Strain energy densities

A kind of neat asphalt and three kinds of diatomite asphalt are tested using differential scanning calorimetry (DSC). The anti-cracking mechanism of diatomite asphalt is analyzed by DSC and the thermal stress restrained specimen test (TSRST) of the asphalt mixtures. The results show that the low temperature performance of diatomite asphalt is better than that of neat asphalt. The glass transition temperature can reflect the low temperature performance of the diatomite asphalt better and has a good relationship with breaking temperatures. Besides, the TSRST, the bending test, the compressing test and the contraction coefficient test are used to study the low temperature performance of the diatomite asphalt mixture. The results prove that the low temperature performance of the diatomite asphalt mixture is better than that of the neat asphalt mixture. The critical bending strain energy density and the compressing strain energy density of the diatomite asphalt mixture are greater than those of the neat asphalt mixture. After adding diatomite to the asphalt mixture, the contraction coefficient is reduced. Based on the above results, the anti-cracking mechanism of the diatomite asphalt mixture is analyzed from the angle of contraction performance and breaking energy.

• 出版日期2009