Research progress of high modulus asphalt concrete(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:
- 1-15
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Research progress of high modulus asphalt concrete
- Author(s):
- WANG Chaohui; SHU Cheng; HAN Bing; FU Yi; ZHOU Liwei
- 1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. Qilu TransportationDevelopment Group Co. Ltd., Jinan 250101, Shandong, China; 3. Tianjin Municipal EngineeringDesign & Research Institute, Tianjin 300051, China
- Keywords:
- road engineering; high modulus asphalt concrete; performance evaluation; mechanical property; road performance
- PACS:
- -
- DOI:
- -
- Abstract:
- To further improve the durability of pavement and road materials, promoting the application of high modulus asphalt concrete (HMAC), existing research and application results in China as well as foreign research were reviewed. The relative standards and evaluation indexes of HMAC in France, Europe and China were compared. The conversion results of high modulus technology and technical indexes were clarified. With the comparison of mechanical properties and pavement performance of HMAC prepared by lowgrade hard asphalts, blended asphalts, and polyolefins (admixtures), suggestions were put forward to improve its lowtemperature performance. The results show that the relevant standards of HMAC in various countries stipulate that the dynamic modulus should be greater than 14 GPa. However, the transformation of HMAC in different countries distinguishes between the forming methods and performance verification tests of specimens. Dynamic modulus, stability, and rutting depth are often used to evaluate the hightemperature performance of HMAC prepared abroad, of which the average values are 15 836 MPa, 7 393 times/mm and 2.34 mm, respectively. In China, dynamic modulus and dynamic stability are the main hightemperature performance indicators. Among these three methods, the dynamic modulus of lowgrade hard asphalt HMAC is the highest, with a mean value of 20 827 MPa, but the dynamic stabilities and fatigue properties of admixture HMAC are the best, with a mean value of 11 640 times/mm and 146 173 times (400×10-6 strain levels). The differences between the road performance of mixtures with different admixtures is evident. Most HMACs have poor crack resistance at low temperatures, which could be improved by adding rubber powder, PE, etc. Considering the development limitations of lowgrade hard asphalts in China, it is necessary to find suitable additives and improve the lowtemperature performances of mixtures to promote the development of HMAC. 1 tab, 9 figs, 66 refs.
Last Update: 2020-01-17