System for Processing of Reclaimed Asphalt Planings (RAP) for High Percentage Incorporation of RAP in new lay road surfaces (Infrarap)

再生沥青刨面 (RAP) 处理系统，以便在新铺设路面中高比例地掺入 RAP (Infrarap)

• 批准号: 720468
• 金额: $ 24.67万
• 依托单位: CANNING CONVEYOR CO. LIMITED
• 依托单位国家: 英国
• 项目类别: GRD Development of Prototype
• 财政年份: 2014
• 资助国家: 英国
• 起止时间: 2014 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=720468
• 关键词: System; Processing; Reclaimed; Asphalt; Planings

Currently, asphalt removed from a road is stockpiled for later use as aggregate for new hotmix asphalt (HMA) at an asphalt plant. This reclaimed material, commonly known as RAP –recycled or reclaimed asphalt planings, is crushed to a consistent gradation and added to theHMA mixing process. Asphalt consists of 95% aggregate and 5% bitumen, both of which arevaluable resources with high embedded energy and CO2 footprint.Several in-situ and ex-situ recycling techniques exist for asphalt recycling the most commonof which introduces RAP using a cold feed which bypasses the drying drum. Due to the highmoisture content, very low volumes (~20%) are re-used at a significantly high energy costbecause the virgin aggregate must be heated to 200-300 deg C. There are also significantissues with the quality of the final product as the aged bitumen binder is damaged by the hightemperature needed to dry the virgin aggregate and becomes susceptible to UV degradationand is rendered liable to early stone loss and cracking.The Infrarap project aims to develop a system for processing RAP so that higher percentagescan be incorporated into paving materials and especially into the wearing course layer. Thesystem will comprise adaptable heating, mixing and conveying systems which will feed RAPat an optimum low temperature into elevating skips or direct to a mixer-feed chute via aconveyor of a static mixing plant or a mobile mixing plant using an efficient rejuvenatorwhich will allow high percentages of RAP to be recycled into asphalt mixes at lowtemperatures.The development follows some preliminary investigations into current methods ofincorporating RAP into mixes, including alternative systems. There is a clear market need foran independent method of heating and directly feeding RAP into the pug-mills of mixingplants that bypasses a drying drum and obviates all adverse issues with scorching RAP andblocking filters and screens.

目前，从道路上清除的沥青被储存起来，供以后在沥青厂用作新型热拌沥青 (HMA) 的骨料。这种再生材料通常称为 RAP（再生或再生沥青刨花），被粉碎至一致的级配并添加到 HMA 混合过程中。沥青由 95% 的骨料和 5% 的沥青组成，两者都是具有高嵌入能量和二氧化碳足迹的宝贵资源。沥青回收存在多种就地和异地回收技术，其中最常见的是使用绕过干燥滚筒的冷进料引入 RAP。由于水分含量高，重复使用的体积非常小（约 20%），能源成本非常高，因为原始骨料必须加热到 200-300 摄氏度。最终产品的质量也存在重大问题，因为干燥原始骨料所需的高温会损坏老化的沥青粘合剂，并且容易受到紫外线降解，并且容易出现早期石料损失和开裂。 Infrarap 项目旨在开发一种处理 RAP 的系统，以便将更高比例的 RAP 纳入铺路材料，特别是耐磨层中。该系统将包括适应性强的加热、混合和输送系统，将最佳低温下的 RAP 送入提升料斗，或通过静态搅拌站或移动搅拌站的输送机使用高效再生器将 RAP 直接送入搅拌机进料槽，这将使高比例的 RAP 在低温下回收到沥青混合料中。该开发是在对当前方法进行一些初步研究之后进行的。 将 RAP 融入混音中，包括替代系统。市场显然需要一种独立的方法来加热 RAP 并将其直接送入搅拌设备的搅拌机中，该方法绕过干燥滚筒并消除 RAP 烧焦和过滤器和筛网堵塞的所有不利问题。