Effect of time-temperature coupling on moisture stability of RHAM in post-production stage
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摘要: 为揭示热再生沥青混合料(RHAM)在后生产阶段新旧沥青混融程度演变及其对RHAM水稳定性的作用，在调研后生产阶段中RHAM的温度耗散规律与耗时的基础上，以时-温当量为指标构建了4种典型后生产阶段工况，采用Pb标记新加沥青，借助能谱仪分析了时-温当量对新旧沥青融合的促进作用；通过沥青混合料水敏感性试验模拟了轮胎运行作用下雨水对再生沥青路面的冲刷效应，解析了时-温当量与RHAM在动水冲刷条件下水稳定性的定量关系；对比了5个厂拌热再生沥青路面工程中7种RHAM在后生产阶段前后的强度差异，并论证了时-温当量对再生沥青路面压实度的影响。研究结果表明：后生产阶段中新旧沥青的融合程度与时-温当量呈正比关系；提高时-温当量可抑制动水冲刷下RHAM的空隙发育，从而改善其水稳定性；时-温当量每提高10%，RHAM在未冲刷和弱、中、强冲刷下的马歇尔稳定度分别增大了0.86%、2.94%、2.13%和3.34%，冻融前后的劈裂强度分别提高了1.24%和0.21%；RHAM经历后生产阶段后的稳定度均较之前有显著提高，增幅介于9.0%~32.4%；在保证压实温度和规范施工的前提下，时-温当量与压实质量之间没有必然联系，考虑到时-温当量对RHAM的性能改善作用，建议在保证压实温度的前提下设法延长后生产阶段。Abstract: To reveal the evolution of blending degree of aged and virgin asphalt in the post-production stage of recycled hot-mix asphalt mixture (RHAM) and its effect on the moisture stability of RHAM, the temperature dissipation law and time consumption of RHAM in the post-production stage were investigated, and four typical post-production stage working conditions were constructed, with the time-temperature equivalent as the indicator. The effect of time-temperature equivalent on promoting the blending of aged and virgin asphalt was revealed by using Pb to identify the virgin asphalt, with the help of the energy dispersive spectrometer analysis. The scouring effect of rainwater on the recycled asphalt pavement under the action of tire running was simulated through the moisture-induced sensitivity test of asphalt mixture. The quantitative relationship between the time-temperature equivalent and the moisture stability of RHAM under the dynamic water scouring conditions was analyzed. The strength differences of seven types of RHAMs before and after the post-production stage in five plant-mixed hot recycled asphalt pavement projects were compared, and the effect of time-temperature equivalent on the compaction of recycled asphalt pavement was demonstrated. Research results show that the blending degree of aged and virgin asphalt is directly proportional to the time-temperature equivalent in the post-production stage. The void development of RHAM under the dynamic water scouring can be prevented by increasing the time-temperature equivalent, so as to improve its moisture stability. As the time-temperature equivalent increases by 10%, the Marshall stabilities of RHAM under unscoured, weak, medium, and strong scouring conditions increase by 0.86%, 2.94%, 2.13%, and 3.34%, respectively, and the splitting strengths before and after freeze-thawing increase by 1.24% and 0.21%, respectively. The stability of RHAM after the post-production stage improves significantly, with the increase amplitude ranging from 9.0% to 32.4%. Under the premises of ensuring the compaction temperature and standardized construction, there is no inevitable relationship between the time-temperature equivalent and the compaction quality. Since the time-temperature equivalent can improve the performance of RHAM, it is recommended to extend the post-production stage under the premise of ensuring the compaction temperature.
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图 2 后生产阶段各环节关键节点的典型红外热像结果
Figure 2. Typical infrared thermal image results of key nodes in each link in post-production stage
图 3 后生产阶段中RHAM温度下降规律
Figure 3. Decreasing laws of RHAM temperature in post-production stage
图 4 AC-20型40%RAP掺量的RHAM级配曲线
Figure 4. Gradation curves of AC-20 RHAM with 40% RAP content
图 6 新旧沥青融合程度评价方法
Figure 6. Evaluation methods for diffusion degree of new and old asphalt
图 8 试验段沥青路面压实度测试方案
Figure 8. Test scheme for compactness of asphalt pavement in test section
图 9 不同工况下RAP矿料表面沥青胶浆的代表性形貌及Pb分布特征
Figure 9. Representative morphologies and Pb distributions of asphalt mortar on RAP aggregate surface under different working conditions
图 10 不同工况下新旧沥青的融合程度
Figure 10. Diffusion degrees of new and old asphalt under different working conditions
图 14 实体工程中RHAM在后生产阶段前、后的马歇尔稳定度
Figure 14. Marshall stabilities of RHAM before and after post-production stage in physical engineering
图 15 四种工况下RHAM路面试验段的压实度
Figure 15. Compactnesses of test pavement section of RHAM under four working conditions
图 16 四种工况下再生沥青路面的压实度特征
Figure 16. Compactness characteristics of recycled asphalt pavement under four working conditions
表 1 后生产阶段中RHAM的温度代表值和耗时
Table 1. Temperature representative values and time consumptions of RHAM in post-production stage
后生产阶段 工况 1# 2# 3# 4# 短期存储环节 温度代表值/℃ 178 耗时/min 40 运输环节 温度代表值/℃ 177 174 172 169 耗时/min 30 60 90 120 现场等待环节 温度代表值/℃ 168 162 157 151 耗时/min 30 60 60 90 摊铺与碾压环节 温度代表值/℃ 135 129 123 118 耗时/min 30 时-温当量/(℃·min) 21 520 31 150 35 710 44 530 
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表 2 RAP矿料级配与沥青含量试验结果
Table 2. Test results of RAP aggregate gradation and asphalt content
矿料规格/
mm不同筛孔尺寸(mm)的通过率/% 沥青含量/
%13.200 9.500 4.750 2.360 1.180 0.600 0.300 0.150 0.075 0~8 100.0 100.0 99.3 86.4 67.3 47.3 31.9 25.2 18.3 5.42 8~13 100.0 97.0 50.6 25.8 19.1 14.4 10.5 8.6 6.4 2.65
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表 3 RAP技术指标
Table 3. Technical indexes of RAP
材料类型 试验项目 试验结果 RAP中的沥青 25 ℃针入度/0.1 mm 23 软化点/℃ 62.1 15 ℃延度/cm 19.2 60 ℃动力黏度/(Pa·s) 2 980 RAP中的粗集料 压碎值/% 10.2 针片状含量/% 13.4 表观相对密度 2.701 RAP中的细集料 表观相对密度 2.686
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表 4 石灰岩集料技术指标
Table 4. Technical indexes of limestone aggregate
试验项目 技术要求 试验结果 矿粉 0~5 5~10 10~20 压碎值/% ≤28 14.3 针片状含量/% ≤15(粒径大于9.5 mm) 17.3 12.1 ≤20(粒径大于9.5 mm) 表观相对密度 ≥2.5 2.723 2.774 2.891 2.758 吸水率/% ≤3.0 1.26 0.48 黏附性 ≥4 5 5 砂当量/% ≥60 74.3
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表 5 SBS改性沥青技术指标
Table 5. Technical indexes of SBS modified asphalt
试验项目 技术要求 试验结果 25 ℃针入度/0.1 mm 40~60 47.4 软化点/℃ ≥60 78.2 5 ℃延度/cm ≥20 31 135 ℃动力黏度/(Pa·s) ≤3.0 2.357
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表 6 MIST参数
Table 6. Parameters of MIST
试验方案 水温/℃ 冲刷次数 动水压强/kPa 冲刷强度 1 40 1 000 176 弱 2 50 2 000 276 中 3 60 3 000 376 强
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