Curing behavior of dry method epoxy asphalt and
its mixture performance
(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2020年1期
- Page:
- 58-67
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Curing behavior of dry method epoxy asphalt and
its mixture performance
- Author(s):
- LI Yue1; 2; ZHANG Yanjun3; CAO Dongwei2; JIA Xiaopeng3;
DU Rongjie4; DONG Rui4
- 1. School of Civil Engineering， Chongqing Jiaotong University， Chongqing 400074， China； 2. Zhonglu Gaoke<br />(Beijing) Road Technology Co., Ltd.， Beijing 100088， China； 3. Zhonglu Jiaojian (Beijing) Engineering<br />Materials Technology Co., Ltd.， Beijing 100088， China； 4. Qilu Transportation Development<br />Group Co., Ltd., Jinan 250000， Shandong， China
- Keywords:
- road engineering; curing behavior; mixture performance; differential scanning calorimetry; laboratory test; dry method epoxy
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to solve the problems of poor stability, easy segregation, onsite preparation, strict application requirements and complicated application procedures of epoxy asphalt and its mixture, the performance of a selfmade dry epoxy material and its mixture was studied. At first, the dispersity of dry epoxy material and asphalt with optical microscope were observed when the ratios were 1∶2, 1∶3 and 1∶4, then the best ratio for the curing state of dry epoxy asphalt was found. Nonisothermal DSC test was used to analyze the curing behavior and the curing degree of materials with different curing times. DoseResp model was used to make the relationship curve between the curing degree and time. The temperature and time of mixed material to maintain health through the curing behavior were determined preliminarily and the mixture performance was studied. The results show that when the ratio of dry epoxy material to asphalt is 1∶3, the dispersion is dense and there is no obvious agglomeration phenomenon, and a stable network crosslinked structure is gradually formed with the increase of time at 150 ℃. Under different heating rates, the higher the heating rate, the lower the curing heat and the less full the curing reaction. The curing reaction of the dry epoxy material is calculated approximate the firstorder reaction, which is heat concentrated and easy to carry out, by Kissing equation and Ozawa equation. DoseResp model has a high accuracy in fitting the convension percentage of the curing reaction of the dry epoxy material. In practical application, the model can be used to preliminarily determine the degree of solidification, which has a good guiding effect on time control in research and application. Marshall stability of the dry epoxy asphalt mixture can reach 53.34 kN, the dynamic stability of rut at 60 ℃ can reach 42 000 times, and that at 70 ℃ can reach 25 200 times, and the freezethaw strength ratio is greater than 100%, residual stability of immersion is greater than 90%, low temperature bending performance meets the requirements.
7 tabs, 8 figs, 27 refs.
Last Update: 2020-01-17