Preparation and properties of biomass heavy oil and bio-asphalt(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 27-35
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Preparation and properties of biomass heavy oil and bio-asphalt
- Author(s):
- CAO Xuejuan1; 2; LIU Yugui1; 3; CAO Xinxin4; LIU Pan3; MIAO Chengcheng1; FENG Yunxia1
- （1. School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China； 2. National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing 400074， China; 3. Chongqing Zhixiang Paving Technology Engineering Co., Ltd., Chongqing 400076, China; 4. School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China）
- Keywords:
- road engineering; bioasphalt; performance test; biomass heavy oil
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to prepare bioasphalt and alleviate the dependence of road construction on petroleum asphalt. In this paper, sawdust was used as a biomass raw material to prepare biomass heavy oil by thermal liquefaction. Bioasphalt was prepared by mixing heavy oil into 50# matrix asphalt, which could be used to partial replace petroleum bitumen. First, the physical and chemical properties of biomass heavy oil were analyzed by infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. Then, the effects of heavy oil content on the basic physical properties of bioasphalt were investigated by three major indexes, needle penetration, softening point, and ductility. The adhesion of bioasphalt was evaluated by using the boiling method. Low temperature performance, high temperature performance, and creep recovery performance of bioasphalt were analyzed using a differential thermal scanner (DSC) and dynamic shear rheometer (DSR). The results show that heavy oil has a similar chemical structure with the 70# matrix asphalt, and it has good thermal stability. The thermal decomposition rate at 165 ℃ is only 3.6%, and the existence of spherical granular biochar with a diameter of about 3 μm in heavy oil is beneficial for improving the hightemperature performance of the bioasphalt. With an increase in the heavy oil content, the needle penetration of bioasphalt increases, and the softening point, ductility, and glass transition temperature Tg decrease. Further, the low temperature performance of the bioasphalt is improved, and a good adhesion performance can be maintained. When the amount of heavy oil (mass fraction, the same below) is 10% in the bioasphalt, the performance of the bioasphalt is closed to that of the 70# matrix bitumen. The rutting factor and complex shear modulus of bioasphalt are between 50# matrix asphalt and 70# matrix asphalt, the bioasphalt has better high temperature resistance to permanent deformation and shear resistance greater than that of the 70# matrix bitumen. In addition, the results of the average strain recovery rate R and average unrecoverable creep compliance show that the creep recovery performance of bioasphalt is better than that of the 70# matrix bitumen. 5 tabs, 10 figs, 31 refs.
Last Update: 2019-05-23