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首页> 外文期刊>The international journal of pavement engineering & asphalt technology >WARM CHEMICAL ADDITIVE TO IMPROVE WATER RESISTANCE OF ASPHALT MIXTURES CONTAINING STEEL SLAGS: A MULTI-SCALE APPROACH
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WARM CHEMICAL ADDITIVE TO IMPROVE WATER RESISTANCE OF ASPHALT MIXTURES CONTAINING STEEL SLAGS: A MULTI-SCALE APPROACH

机译：温暖的化学添加剂，可改善含钢渣的沥青混合物的耐水性：多尺度方法

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摘要

Warm mix asphalt (WMA) represents a suitable technology to enhance environmental sustainability of road paving. WMA is an asphalt concrete that can be produced and compacted at lower temperatures than usual. The additional inclusion of recycled aggregates (e.g. steel slags) in substitution of natural ones is a widespread solution effectively leading to further environmental benefits. In this sense, the assessment of moisture susceptibility could delineate an interesting investigation topic since some issues related to bitumen-steel slags chemical affinity were evinced. Given this background, the present paper shows an experimental characterization aimed at investigating moisture susceptibility of WMA containing electric arc furnace steel slags through a multi-scale analysis approach. In particular, a chemical additive containing anti-stripping agents and adhesion promoters was used to obtain warm mixes. To achieve the above-mentioned goal, stripping tests were performed on bitumen-aggregate systems and analyzed with a digital imaging processing method. Moreover, warm asphalt mixes were subjected to freeze-thawing procedures in order to study the water effects on stiffness characteristics and indirect tensile strengths. A reference unmodified binder and traditional natural aggregates (limestone) were also tested for comparison purposes. Experimental results showed analog trends both at bitumen-aggregate and mixture scale, demonstrating that warm modification by chemical additive is a promising technology able to prevent stripping problems mitigating issues related to bitumen-steel slags affinity.
机译：温拌沥青（WMA）代表了一种合适的技术，可增强路面的环境可持续性。 WMA是一种沥青混凝土，可以在比通常更低的温度下生产和压实。除天然成分外，还包含回收骨料（例如钢渣）是一种广泛的解决方案，有效地带来了更多的环境效益。从这个意义上讲，对水分敏感性的评估可以描述一个有趣的研究课题，因为其中发现了一些与沥青钢渣化学亲和性有关的问题。在这种背景下，本文显示了一种旨在通过多尺度分析方法研究含WMA电弧炉钢渣的湿气敏感性的实验表征。特别地，使用包含抗剥离剂和粘合促进剂的化学添加剂来获得温和的混合物。为了达到上述目的，在沥青骨料系统上进行了剥离试验，并用数字成像处理方法进行了分析。此外，为了研究水对刚度特性和间接拉伸强度的影响，对温暖的沥青混合料进行了冻融程序。还对参考未改性的粘合剂和传统的天然骨料（石灰石）进行了比较测试。实验结果显示了沥青集料和混合料的模拟趋势，表明化学添加剂的热改性是一种有前途的技术，能够防止剥离问题，从而减轻与沥青钢渣亲和力有关的问题。

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