A New Approach to Recycle Asphalt Shingles in Hot Mix Asphalt

本项目的目的是测试屋顶瓦片废料可以通过湿法与沥青结合料混合的假设，在湿法过程中，在与集料混合之前，将研磨的再生材料与粘结剂在高温下混合。通过验证将废弃沥青瓦片应用于沥青路面施工的新方法，本研究结果可能会对沥青瓦片在路面施工中的回收实践产生革命性的影响。由于沥青屋面的沥青含量变化很大，目前将再生沥青屋面板(RAS)与集料干混，然后再将沥青结合料添加到批次中的做法经常受到批评。建议的湿法可增加混合料中沥青瓦的使用率，并可更好地控制混合料中发生的化学反应和物理反应。建议的方法有潜力应对建筑垃圾的增加，同时减少沥青建筑中石油产品的消耗，并提高资源效率。教育活动将寻求促进本科生和高中生对可持续发展概念的理解，并通过为历史上黑人院校南方大学的一名学生和路易斯安那州立大学的一名工程学女学生提供两个暑期实习机会，吸引代表人数不足的群体的学生参加实验室活动。拟议的教育活动还将在路易斯安那州立大学、南方大学和主要服务于代表性不足群体的高中之间建立伙伴关系。

The objective of this project is to test the hypothesis that roofing shingle scrap may be blended with asphalt binder through a wet process, in which the ground recycled material is blended with the binder at high temperature prior to mixing with the aggregates. Results of this research may revolutionize recycling practices of asphalt shingles in pavement construction by validating a new approach to incorporate discarded asphalt shingles into asphalt pavement construction. Current practices of dry blending Recycled Asphalt Shingles (RAS) with the aggregates before the asphalt binder is added to the batch are often criticized due to the large variability observed in the asphalt content of asphalt shingles. The proposed wet process may offer the potential to increase the percentage of asphalt shingles used in the mixture and may allow for a better control of the chemical and physical reactions taking place in the blend.The proposed approach has the potential to cope with the increase in construction waste while reducing the consumption of petroleum products in asphalt construction and increase resource efficiency. Educational activities will seek to promote the understanding of sustainability concepts among undergraduate and high school students and to engage students from underrepresented groups into laboratory activities by offering two summer internships for a student from Southern University, a historically black institution, and for one female engineering student from LSU. Proposed educational activities will also establish a partnership between LSU, the flagship institution for the state, and Southern University and high schools predominantly serving underrepresented groups.