Design and Performance Evaluation of High Stiffness Asphalt Concrete

• Main Authors: HAO-WEI CHANG, 張皓為
• Other Authors: Min-Chih Liao
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/45y5h6

碩士 === 國立臺灣科技大學 === 營建工程系 === 106 === The conventional dense graded asphalt concrete with a penetration grade 60/70 could not be capable of carrying heavily traffic loads, while another built environmental issue related to polymer modified asphalt is the difficulty with the recycling work in the future. A suitable binder course material is high stiffness asphalt concrete. The idea of high stiffness asphalt concrete was to design a mix with hard penetration grade asphalt. The hard grade of the asphalt conferred a higher modulus to the mix which allowed, with equal thickness, to reduce the stresses transmitted to the subgrade. In addition, the asphalt material proportion was designed in terms of the pavement performance-related requirements. The objective of this study was to investigate the rheological properties of hard penetration grade asphalt, and to assess the performance characteristics of the high stiffness as well as conventional asphalt concrete. The results showed that the optimum asphalt content of the asphalt concrete was determined based on the richness modulus (K). The performance characteristics of the stability, indirect tensile strength and permanent deformation for the asphalt concrete could be well interpreted by means of the DSR master curves over a wide range of the temperatures. With regard to the wheel track testing, the polymer modified asphalt mixtures had better resistance to rutting compared to the asphalt concrete with the penetration grade 20/40 asphalt in terms of the proportional rut depth. In addition, The Burgers model satisfactorily explained the mixture rutting behavior. The results clearly demonstrated that rutting resistance was improved with increasing the binder viscosity.