摘 要
废旧沥青混合料（Reclaimed Asphalt Pavement, RAP ）的掺量决定着再生沥青混合料的性能，实现RAP 掺量的快速评估检测是保证再生沥青路面质量的关键手段。RAP 料存在较大的变异性，使其在再生沥青混合料中的用量受到限制，目前对再生沥青混合料的质量控制主要集中在实验室进行力学性能的验证，尚不能较为快速、准确地对其质量进行评估。红外光谱可以实现快速无损检测，在其他建筑材料质量控制研究上取得了丰富的成果，也为本文的研究提供了思路与理论支持。
本文采用红外光谱分析技术对RAP 掺量的快速评估方法进行研究验证，探究红外光谱对再生沥青混合料中RAP 掺量预测评估的可行性和准确性，分析不同RAP 掺量再生沥青混合料的路用性能指标，探讨RAP 掺量对再生沥青混合料路用性能的影响，以期提出满足相应指标的RAP 阈值。主要研究内容和成果如下：
基于红外光谱对比了混兑沥青及沥青胶浆中回收旧沥青掺量的两种测试方法，结果表明两种测试方法都可以有效的预测评估旧沥青掺量；依据朗伯-比尔定律，分析了羰基吸收峰的吸光强度随着旧沥青掺量的变化，得到两种测试结果的拟合直线相互平行，线性回归方程的斜率基本相同，表明提出用于再生沥青混合料红外光谱定量分析测试评估方法的可行性。
通过对自制的不同RAP 掺量再生沥青混合料进行红外光谱采集，以RAP 料上表征老化沥青氧化产物的
羰基和亚砜基吸收峰的变化对RAP 掺量进行评估，采用羰基和亚砜基指数作为预测因子，经过线性回归拟合方法建立评估模型，选用未参与模型建立的试样对其进行验证。结果表明得到的评估模型决定系数R 2在0.87～0.96之间，且均大
于决定系数临界值658.02min
R ，存在良好的线性相关性，标准偏差较小，平行试验复现性较高，且RAP 掺量的预测值与实际值更为接近，误差约为±5%。因此，红外光谱可以实现对RAP 掺量进行快速、准确的预测评估。
从再生沥青混合料的水稳定性、高温稳定性、低温抗裂性和耐久性等方面分析了RAP 掺量对其路用性能的影响，表明随着RAP 掺量的增加，再生沥青混合料的抗水损害能力呈现出先增大后减小的变化趋势，高温稳定性增强，低温抗开裂性能减弱，动态模量和发生永久变形所需加载的重复荷载次数表现出先增大后缓慢减小的变化；综合考虑各项性能指标，得到本文在仅添加新沥青再生时RAP 的最高掺量为40%，并提出了满足不同指标要求的RAP 阈值。
关键词：再生沥青混合料；红外光谱；RAP 掺量；快速评估方法；性能评价
Abstract
The content of Reclaimed Asphalt Pavement (RAP) determines the performance of recycled asphalt
mixture. Rapid detection and evaluation of RAP content is the point to ensure the quality of recycled asphalt pavement. RAP has great variability, which limits its usage in recycled asphalt mixture. At prent, the quality control of the recycled asphalt mixture is mainly focus on testing the mechanical properties, which cannot be ud to assd its quality quickly and accurately. Infrared spectroscopy may realize rapid non-destructive testing and has achieved rich results in the quality control of other building materials, which also provides ideas and theoretical support for this study.
In this paper, the rapid evaluation method of RAP content is studied and validated by infrared spectroscopy analysis technology. The feasibility and accuracy of the prediction and evaluation of RAP content in recycled asphalt mixture are studied; The pavement performance indexes of recycled asphalt mixture with different RAP content are analyzed. The influence of RAP content on the pavement performance of recycled asphalt mixture is discusd in order to propo a RAP threshold to meet the corresponding indicators. The main rearch contents and results are as below.
Two test methods for the reclaimed of aging asphalt in mixed asphalt and asphalt mastic were compared by infrared spectroscopy. The results show that each test method can effectively predict and estimate the content of aging asphalt. According to Lambert-Beer's law, the change of absorptio
n intensity of carbonyl absorption peak with the content of aged asphalt is analyzed. The fitting lines of the two test results are parallel to each other, and the slope of the linear regression equation is basically the same. It shows that the propod method for quantitative analysis and evaluation of infrared spectroscopy of recycled asphalt mixture is feasible.
By collecting infrared spectra of recycled asphalt mixture with different RAP content, the content of RAP was evaluated by the changes of carbonyl and sulfoxide absorption peaks of oxidized products of aged asphalt. Carbonyl and sulfoxide index were ud as predicting factors, and the evaluation model was established by linear regression fitting method, and the samples which were not involved in the model were lected to verify the model. The results show that the coefficient of determination R 2 of the evaluation model is between 0.87 and
0.96, which is larger than the critical value of the coefficient of determination (658.02min
R ), indicating a good linear correlation. The standard deviation is small, and the repeatability of parallel test is high. The predicted value of RAP content is clor to the actual value, and the
error is about ±5%. Therefore, infrared spectroscopy can be ud to predict and evaluate RAP content quickly and accurately.
The influence of RAP content on the pavement performance of recycled asphalt mixture is analyzed such as water stability, high temperature stability, low temperature crack resistance and durability. It shows that with the increa of RAP content, the water damage resistance of recycled asphalt mixture shows a trend of increasing first and then decreasing, increasing high temperature stability, weakening low temperature crack resistance, and the dynamic modulus and the number of repeated loads required for permanent deformation increa first and then decrea slowly. Taking all the performance indicators consideration, the maximum content of RAP is 40% when only adding new asphalt to regenerate, and the content thresholds of RAP which meet the requirements of different indicators are put forward.
Key Words：recycled asphalt mixture; ATR-FTIR; RAP content; rapid evaluation method; performance evaluation
目录
摘要..................................................................................................................................... I Abstract ..................................................................................................................................... II 1 绪论. (1)
1.1 研究背景及意义 (1)
1.2 国内外研究现状 (2)xycms
1.2.1 再生沥青混合料质量控制研究 (2)
1.2.2 高RAP掺量再生沥青混合料性能研究 (3)
1.2.3 红外光谱在道路材料中的应用及发展 (4)
1.3 研究内容及技术路线 (8)
1.3.1 主要研究内容 (8)
1.3.2 技术路线 (8)
2 原材料及试验方法 (10)
2.1 原材料 (10)
2.1.1 沥青 (10)
画饼充饥的寓言故事2.1.2 新集料及RAP料 (11)
2.2 试验方法 (13)
lolmsi2.2.1 衰减全反射傅里叶变换红外光谱试验 (13)
2.2.2 再生沥青混合料水稳定性试验 (15)
2.2.3 再生沥青混合料车辙试验 (15)
2.2.4 再生沥青混合料低温小梁弯曲试验 (16)
2.2.5 再生沥青混合料单轴压缩动态模量试验 (17)
2.2.6 再生沥青混合料流变次数试验 (17)
2.3 试样制备方法 (18)
2.3.1 混兑沥青及沥青胶浆红外试样制备 (18)
2.3.2 再生沥青混合料红外试样制备 (19)
2.3.3 再生沥青混合料低温小梁弯曲试件制备 (19)
2.3.4 再生沥青混合料动态模量试件制备 (20)
2.3.5 再生沥青混合料流变次数试件制备 (20)
3 混兑沥青及沥青胶浆中回收旧沥青掺量的快速评估 (22)
3.1 红外光谱的分析方法 (22)
3.1.1 定性分析 (23)
3.1.2 定量分析 (23)
3.2 混兑沥青红外光谱定量分析 (26)
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3.2.1 混兑沥青红外光谱采集 (26)
3.2.2 混兑沥青红外光谱分析 (27)
3.2.3 混兑沥青中旧沥青掺量评估指标的计算 (29)
3.2.4 混兑沥青中旧沥青掺量评估模型的建立与验证 (34)
3.3 沥青胶浆红外光谱定量分析 (37)
3.3.1 沥青胶浆红外光谱分析 (38)
3.3.2 沥青胶浆中旧沥青掺量评估指标的计算 (41)
3.3.3 沥青胶浆中旧沥青掺量评估模型的建立与验证 (44)
3.4 本章小结 (46)
4 厂拌热再生沥青混合料中RAP掺量的快速评估 (47)
4.1 溶解液及悬浮液试样的光谱采集 (47)
4.2 混兑沥青溶解液及沥青胶浆悬浮液红外光谱定量分析 (48)
4.2.1 混兑沥青溶解液及沥青胶浆悬浮液红外光谱分析 (48)
4.2.2 旧沥青掺量评估模型的建立与验证 (57)
白的英文4.2.3 旧沥青掺量快速评估方法可行性的对比 (60)
4.3 RAP掺量快速评估方法的分析 (62)
4.3.1 再生沥青混合料红外光谱分析 (63)悼念读音
4.3.2 RAP掺量评估指标的计算 (64)
4.3.3 RAP掺量评估模型的建立与验证 (68)
4.4 本章小结 (70)
5 不同RAP掺量再生沥青混合料路用性能的研究 (71)
篮球主题
5.1 不同RAP掺量再生沥青混合料配合比设计 (71)
5.1.1 AC-20沥青混合料级配设计 (71)
5.1.2 不同RAP掺量再生沥青混合料目标级配的选择 (73)
5.1.3 再生沥青混合料体积指标测试结果及分析 (76)
5.2 不同RAP掺量再生沥青混合料水稳定性研究 (77)
5.2.1 浸水马歇尔试验结果分析 (77)
礼仪培训公司5.2.2 冻融劈裂试验结果分析 (78)
5.2.3 基于水稳定性对高RAP掺量范围的确定 (79)
5.3 不同RAP掺量再生沥青混合料高、低温性能研究 (80)
