The engineering, economic, and environmental performance of terminal blend rubberized asphalt binders with wax-based warm mix additives
The engineering, economic, and environmental performance of terminal blend rubberized asphalt binders with wax-based warm mix additives
复制标题
DOI：
10.1016/j.jclepro.2018.03.011
复制
发表时间：
2018-05
影响因子：
11.1
通讯作者：
Y. Wen;Yuhong Wang;Kecheng Zhao;D. Chong;Weidong Huang;G. Hao;Shicong Mo
中科院分区：
文献类型：
--
作者：
Y. Wen;Yuhong Wang;Kecheng Zhao;D. Chong;Weidong Huang;G. Hao;Shicong Mo
终端混合（TB）沥青结合料采用精细的废橡胶粉（CR）颗粒在苛刻的条件下生产，是将废轮胎中的CR掺入沥青结合料的替代方法。它具有运输、储存和在沥青混合料厂使用方便的优点。在本文介绍的研究中，Sasobit®和聚乙烯（PE）蜡被用作温拌添加剂，以进一步改善TB沥青粘合剂的性能。这些添加剂预计将降低TB沥青混合料的生产温度，从而减少混合料生产中的燃料消耗和温室气体（GHG）排放，并减少施工中的沥青烟雾。还预期用此类添加剂改性的TB沥青结合料的工程性能不会受到不利影响。为了全面了解两种添加剂对TB沥青结合料的改性效果，进行了多种室内试验，包括储存稳定性、高温性能、低温性能、疲劳性能等基本流变性能。以常规热拌沥青混合料为参照，比较了添加剂与不添加剂的TB沥青混合料的生产成本。还评估了混合物生产中产生的能源消耗和温室气体排放。实际的现场施工是使用TB沥青混合料与Sasobit®和使用传统的沥青混合料进行的。在靠近松散混合物的区域收集气溶胶和挥发性有机化合物（VOC）样本并进行分析。发现两种蜡基添加剂提高TB粘合剂的储存稳定性和可加工性。与蜡基添加剂的使用相关的其他工程性质是混合的。选择合适的添加剂取决于当地的气候条件。而使用TB粘合剂（有或没有添加剂）的成本高于使用基础（纯）沥青粘合剂的成本。当使用添加剂时，混合物生产中的能源消耗和GHG排放减少。基础沥青粘合剂和含Sasobit®的TB粘合剂产生的沥青烟雾相当。总的来说，将蜡基添加剂掺入TB沥青粘合剂中提供了一种更清洁的使用再生橡胶屑的方法。
Produced with fine crumb rubber (CR) particles and at demanding conditions,Terminal Blend (TB)asphalt binder is an alternative approach to incorporating CR from scrap tires into asphalt binders. It offers the advantages of convenient transportation, storage, and usage at asphalt mixture plants. In the study as presented in this paper, Sasobit®and Polyethylene (PE) wax were used as warm-mix additives to further modify the properties of TB asphalt binders. These additives are anticipated to reduce the production temperatures of TB asphalt mixtures, hence reducing fuel consumption and greenhouse gas (GHG) emissions in mixture production and reducing asphalt fumes in construction. It is also anticipated that the engineering performance of TB asphalt binders modified with such additives are not adversely affected. To gain a comprehensive understanding of TB asphalt binders modified with the two additives, a variety of laboratory tests were conducted, including storage stability, high temperature performance, low temperature performance, fatigue, and other basic rheological properties. The costs of producing TB asphalt mixtures with or without the additives were compared, using the conventional hot-mix asphalt mixtures as a reference. Energy consumptions and GHG emissions generated in mixture production were also evaluated. Actual field construction was performed using TB asphalt mixtures with Sasobit®and using conventional asphalt mixtures. Both aerosol and volatile organic compounds (VOCs) samples were collected at zones close to the loose mixtures and were analyzed. The two wax-based additives were found to enhance the storage stability and workability of the TB binders. The other engineering properties related to the use of wax-based additives are mixed. The selection of right type of additive depends on local climate conditions. While the costs of using the TB binders (with or without additives) are higher than the costs of using the base (neat) asphalt binder. Energy consumptions and GHG emissions in mixture production are reduced when the additives are used. Asphalt fumes generated from the base asphalt binder and the TB binder with Sasobit®are comparable. In general, the incorporation of wax-based additives into TB asphalt binder offers a cleaner way of using recycled crumb rubber.