Utilization of BSSF Slag in Flexible Pavement

• Main Author: 廖彥凱
• Other Authors: 劉霈
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/96753851876108732578

碩士 === 逢甲大學 === 運輸科技與管理學系 === 102 === Slag is the by-product of steel plant and one of the most popular recycle materials. By the improvement of steelmaking, various slag are produced in new different processes. When various slag was utilized into pavement engineering, the performance of pavement show some difference. The stabilization and granulation process of Baosteel slag is quacking cooling with water, the rate of cooling will influence the microstructure and physical property. The object of this study is focus on the difference between Baosteel slag and conventional slag with air cooling. Firstly, the physical property of Baosteel slag, conventional slag and conventional nature aggregate were conducted, the Baosteel slag and conventional slag were partly subtitle for nature aggregate in the gradation of dense graded Asphalt Concrete. The DGAC with nature aggregate was regard as comparison, and the mixture with Baosteel slag and conventional slag would be evaluated their performances. At the same time, the microstructure of Baosteel slag will be explored with Polarized optical microscope. According to physical tests, the property of Baosteel slag is similar to conventional; both of them own the very good capacity in resistance of deformation. In this study, the two gradation replacement ratio of nature aggregate with Baosteel slag were 40% and 50%, the mixture design were accordance with AI MS-2. Observation the mixture design and performance test results, and the mixture with Baosteel slag own better anti-moisture sensitive and skid resistance. In Indirect tensile strength and Rut tests, the mixture with Baosteel slag were a little small than other slag mixtures, and there were some micro crack existing in Baosteel slag. The most possible cause of the lower indirect tensile strength and anti-Rut is micro crack in Baosteel. Compared with the conventional nature aggregate mixture, all performances of the mixture with Baosteel slag is better than convention mixture, and the replacement of nature aggregate in DGAC is feasible and worthy of further studying.