Research on Improvement Method of Interfacial Cohesiveness of Foam Asphalt Cold Recycled Binder
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摘要:
为提升泡沫沥青冷再生胶结料（由水泥、旧沥青和泡沫沥青组成）的黏聚性，选取多聚磷酸（PPA）、丁苯橡胶（SBR）、甘油三酯（TG）3种泡沫沥青冷再生胶结料改性剂，利用分子动力学模拟方法建立不同改性剂及其掺量的泡沫沥青冷再生胶结料分子模型；基于界面能、相互作用能、扩散系数和水分子径向分布函数（RDF）等指标研究不同改性剂及其掺量对泡沫沥青冷再生胶结料界面特性改善效果的影响规律，并通过显著性检验和层次分析法分别探讨各指标间显著性差异和改性方案的权重. 结果表明：添加0.8% 的PPA对泡沫沥青冷再生胶结料黏聚性提升效果最为显著，其可以有效改善泡沫沥青冷再生胶结料的界面能、自由体积和水损害影响，亦使泡沫沥青冷再生胶结料具有较好的扩散能力；添加15.0%TG对泡沫沥青冷再生胶结料的相互作用能改善效果较好，但扩散性能较差；添加2.0%的SBR对泡沫沥青冷再生胶结料的抗水损害能力改善效果最好，但SBR总体改性效果一般； 不同剂掺量之间不存在显著性影响，各改性剂掺配方案相互独立且各有优势.
Abstract:To improve the cohesiveness of foam asphalt cold recycled binder (composed of cement, old asphalt, and foam asphalt), three modifiers of foam asphalt cold recycled binder, including polyphosphoric acid (PPA), polymerized styrene butadiene rubber (SBR), and triglyceride (TG) were selected, and molecular models of foam asphalt cold recycled binder with different modifiers and their dosage were established by molecular dynamics simulation method. The effect of different modifiers and their dosage on the improvement of the interface properties of foam asphalt cold recycled binder was studied based on interface energy, interaction energy, diffusion coefficient, and radial distribution function (RDF) of water molecules. The significance difference of each index and the weight of the modification scheme were discussed by significance tests and the analytic hierarchy process. The results have shown that the addition of 0.8% PPA has the most significant effect on the cohesiveness of the foam asphalt cold recycled binder, which can effectively improve the interfacial energy, free volume, and water damage of the foam asphalt cold recycled binder, and also make the foam asphalt cold recycled binder have better diffusion ability. The addition of 15.0% TG can improve the interaction effect of the foam asphalt cold recycled binder, but the diffusion ability is poor. The addition of 2.0% SBR has the best effect on the water damage resistance of foam asphalt cold recycled binder, but the overall modification effect of SBR is not so good. There is no significant influence among different dosages of modifiers, and each modification scheme is independent and has its own advantages. After comprehensive comparisons, 0.8% PPA has the best effect on improving the interfacial cohesiveness of foam asphalt cold recycled binder.
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Key words:
- aged asphalt /
- cold recycle /
- cohesiveness /
- molecular dynamics /
- modified asphalt
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图 1 沥青代表性分子
Figure 1. Representative molecules of asphalt: （a1） aromatic, （b1） asphaltene, （c1） colloid, and （d1） saturated; （a2）–（d2） corresponding components after aging
图 3 改性剂分子模型及对应改性老化沥青分子模型
Figure 3. Molecular models: （a1） TG; （b1） SBR; （c1） PPA; （a2）–（c2） are the corresponding modified aging asphalt
图 7 各组分界面能
Figure 7. Interface energy of different groups: （a） cement; （b） aged asphalt; （c） foam asphalt
图 8 不同改性剂的扩散系数
Figure 8. Diffusion coefficients of different modifiers: （a） PPA; （b） SBR; （c） TG
图 9 不同掺量下胶结料中水分子RDF
Figure 9. Water RDF of binders at different dosages: （a） PPA; （b） SBR; （c） TG
表 1 沥青分子模型分子信息
Table 1. Information on asphalt molecule models
组分 基质沥青模型 LTAA模型 化学式 个数/个 化学式 个数/个 沥青质 C42H54O 3 C42H46O5 2 C66H81N 2 C66H67NO7 2 C51H62S 3 C51H54O5S 3 饱和分 C30H62 4 C30H62 6 C35H62 4 C35H62 8 芳香分 C35H44 11 C35H36O4 11 C30H46 13 C30H42O2 9 胶质 C40H59N 4 C40H55NO2 2 C40H60S 4 C40H56O3S 8 C18H10S2 15 C18H10O2S2 15 C36H57N 4 C36H53NO2 2 C29H50O 5 C29H48O2 2 
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表 2 方差齐性检验
Table 2. Homogeneity of variance test
数据处理方法 莱文统计 自由度1 自由度2 显著性 基于平均值 0.001 8 36.00 1 基于中位数 0.009 8 36.00 1 基于中位数且
具有调整后自由度0.009 8 35.91 1 基于剪除后平均值 0.001 8 36.00 1
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表 3 层次分析结果
Table 3. Hierarchy analysis results
方案 权重 方案 权重 方案 权重 0.2%PPA 0.08 1.0%SBR 0.05 5.0%TG 0.07 0.4%PPA 0.12 2.0%SBR 0.07 10.0%TG 0.15 0.8%PPA 0.24 3.0%SBR 0.07 15.0%TG 0.11
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