Swelling Potential and Performance Level of Hot Mix Asphalt Containing Not-Hydrated Ladle Furnace Steel Slags as Filler

IF 0.8 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Journal of Testing and Evaluation Pub Date : 2023-09-19 DOI:10.1520/jte20230261

Antonio Roberto, Riccardo Monticelli, Riccardo Roncella, Elena Romeo, Gabriele Tebaldi

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Abstract

Nowadays, the use of carbon-neutral materials is an urgent need because of energy consumption and CO2-emissions concerns. Thus, the use of ladle furnace steel slags (LFSs) is becoming common in asphalt pavement fields. One of the limitations on using LFSs is linked to swelling potential because of the changes in chemical structure due to the hydration of their components. In this study, two different asphalt binders, neat and 3.5 % styrene-butadiene-styrene modified, were mixed with limestone coarse aggregates and two fillers (limestone and LFSs) to analyze the swelling potential and the performance levels of hot mix asphalts containing not-hydrated LFSs as filler. The analysis was conducted performing the SuperPave indirect tensile test protocol at 10°C and by using a 3D-digital image correlation metadata model (3D-DICM) capable of computing the volumetric expansion of materials after four different periods of conditioning in water (24, 48, 168, and 336 h). The results showed no significant differences among the analyzed materials, highlighting that the volumetric expansion is mainly linked to the aggregates’ water absorption. On the other hand, conditioning time seems to affect the deformability of the mixtures, influencing performance level.

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含不水合钢渣填料的热拌沥青膨胀势及性能水平

如今，由于能源消耗和二氧化碳排放问题，迫切需要使用碳中性材料。因此，钢包炉钢渣(LFSs)在沥青路面领域的应用越来越普遍。使用lfs的限制之一与膨胀势有关，因为它们的成分水化会改变化学结构。本研究将纯沥青和3.5%苯乙烯-丁二烯-苯乙烯改性沥青两种不同的粘结剂与石灰石粗集料和两种填料(石灰石和lfs)混合，分析了不水合lfs作为填料的热混合沥青的膨胀势和性能水平。采用SuperPave间接拉伸试验方案，在10°C下进行分析，并使用3d -数字图像相关元数据模型(3D-DICM)，该模型能够计算材料在水中经过4个不同时期(24、48、168和336 h)后的体积膨胀。结果显示，所分析的材料之间没有显著差异，突出表明体积膨胀主要与聚集体的吸水率有关。另一方面，调理时间似乎会影响混合物的变形能力，影响性能水平。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Testing and Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

8.30%

发文量

221

审稿时长

6.7 months

期刊介绍： This journal is published in six issues per year. Some issues, in whole or in part, may be Special Issues focused on a topic of interest to our readers. This flagship ASTM journal is a multi-disciplinary forum for the applied sciences and engineering. Published bimonthly, the Journal of Testing and Evaluation presents new technical information, derived from field and laboratory testing, on the performance, quantitative characterization, and evaluation of materials. Papers present new methods and data along with critical evaluations; report users'' experience with test methods and results of interlaboratory testing and analysis; and stimulate new ideas in the fields of testing and evaluation. Major topic areas are fatigue and fracture, mechanical testing, and fire testing. Also publishes review articles, technical notes, research briefs and commentary.