Evaluation of Hot-Mix Asphalt Containing Portland Cement Treated Blast Furnace Slag

• Main Authors: Rondón-Quintana H. A., Ruge-Cardenas J. C., Bastidas-Martínez J. G.
• Format: Article
• Language: English
• Published: Sciendo 2019-06-01
• Series: Archives of Civil Engineering
• Subjects: blast furnace slag; hot mix asphalt; portland cement; resistance under monotonic and cyclic loading; resistance to moisture damage; cantabro
• Online Access: http://www.degruyter.com/view/j/ace.2019.65.issue-2/ace-2019-0028/ace-2019-0028.xml?format=INT

Iron production’s waste materials include significant quantities of blast furnace slag (BFS) which could potentially be used as a substitute for natural aggregates in hot mix asphalt (HMA) used in highway projects. Although many of properties of slag are interesting, its porosity and absorption rate would lead to greater consumption of asphalt. For this study, a Portland cement (PC) paste was used to reduce the porosity of a BFS. This PC treated BFS (called BFS-C) was then used in an HMA to replace the coarse fraction of a natural aggregate. Marshall, Indirect Tensile Strength (ITS), resilient modulus and Cantabro tests were then carried out on different HMA mixtures that included BFS-C. Using BFS-C, HMA’s resistance under monotonic loading, stiffness under cyclic loading, and resistance to moisture damage increased remarkably. In addition, the Cantabro abrasion resistance of BFS-C improved was better than that of the HMA mixture produced with untreated BFS.