Department of Civil, Architecture, Territory and Environmental Engineering, University of Brescia, Via Branze 43, Brescia, 25123, Italy.
J Hazard Mater. 2012 Mar 30;209-210:84-91. doi: 10.1016/j.jhazmat.2011.12.066. Epub 2012 Jan 9.
This paper presents a comprehensive study to evaluate the mechanical properties and environmental suitability of electric arc furnace (EAF) steel slag in bituminous paving mixtures. A variety of tests were executed on samples of EAF slag to characterize the physical, geometrical, mechanical and chemical properties as required by UNI EN specifications, focusing additionally on the volumetric expansion associated with hydration of free CaO and MgO. Five bituminous mixtures of aggregates for flexible road pavement were designed containing up to 40% of EAF slag and were tested to determine Marshall stability and indirect tensile strength. The leaching behaviour of slag samples and bituminous mixtures was evaluated according to the UNI EN leaching test. The tested slag showed satisfactory physical and mechanical properties and a release of pollutants generally below the limits set by the Italian code. Tests on volume stability of fresh materials confirmed that a period of 2-3 months is necessary to reduce effects of oxides hydration. The results of tests performed on bituminous mixtures with EAF slag were comparable with the performance of mixtures containing natural aggregates and the leaching tests provided satisfactory results.
本文对电弧炉（EAF）钢渣在沥青铺装混合料中的力学性能和环境适应性进行了全面研究。对 EAF 渣样品进行了多种测试，以按照 UNI EN 规范的要求对其物理、几何、力学和化学性能进行了表征，此外还重点关注了与游离 CaO 和 MgO 水化相关的体积膨胀。设计了五种用于柔性道路铺装的骨料沥青混合料，其中包含高达 40%的 EAF 渣，并对其进行了马歇尔稳定性和间接拉伸强度测试。根据 UNI EN 浸出试验对渣样品和沥青混合料的浸出行为进行了评估。测试的渣显示出令人满意的物理和力学性能，其污染物释放通常低于意大利法规规定的限值。对新鲜材料体积稳定性的测试证实，需要 2-3 个月的时间才能减少氧化物水化的影响。含有 EAF 渣的沥青混合料的测试结果与含有天然骨料的混合料的性能相当，浸出测试也提供了令人满意的结果。
