冷再生沥青路面材料性能及结构组合研究
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摘要
路面冷再生技术能有效利用废料,符合我国可持续发展战略中废物资源化的要求和节能减排的发展理念。目前,沥青路面冷再生技术尚未形成完整的体系,在国内仍处于起步阶段,我国在试验方法、试验手段、设计标准、路面结构类型等方面与国外相差较大。国内对于冷再生结构层在路面中的响应状态、再生路面结构组合的研究较少,在路面结构再生维修时,再生层层位、厚度及路面厚度的选择一般采用新建路面设计或改建路面设计方法,参数的选取仅仅依靠规范推荐值,这样设计出来的路面不能满足使用性能的需要,路面的使用寿命往往较短。
     基于此,本文通过室内性能试验与现场验证对冷再生混合料配合比设计的养生方式和设计指标进行了研究,提出了乳化沥青冷再生混合料的养生方法。并提出再生混合料配合比设计以冻融及干湿劈裂强度及其强度比为控制指标,以孔隙率、马歇尔稳定度作为参考指标。根据路面病害类型及程度,设置了七种再生路面结构和一种传统维修路面结构,通过实测路面结构动态响应分析发现:再生路面结构应变的温度敏感性低于热拌沥青路面结构,路面厚度对层底应变的影响较大;随着轴载和温度的升高,再生层底的拉应变不断增加,温度越高,最大应变增加的趋势越快;路面结构再生层以下结构层顶面应力受路面厚度影响较大,受车速的影响较小;根据各方案路面结构的应变响应情况,路面结构厚度最薄的方案三(CRP3)应变最大,纵向应变响应从大到小排序为:CRP3(CRP4)>CRP5>CRP6(CRP8)>CRP1(CRP2)>CRP7,其中CRP3与CRP4,CRP1与CRP2以及CRP6与CRP8除胶结料不同之外其余均相同,应变响应性能接近。
     基于路面结构动态力学响应及室内材料参数性能试验,对再生路面结构参数及接触条件进行了对比分析,结果表明再生层的结构强度、沥青面层厚度及层间接触状态对路面结构性能具有显著影响,根据理论计算与实测数据分析提出了冷再生路面结构设计的材料参数,解决了再生路面典型结构理论计算结果与实际状态不相符的问题。根据再生混合料室内疲劳试验及试验路疲劳分析,初步确定了典型再生沥青混合料的疲劳极限水平。基于室内性能试验及试验路实测路面结构动态响应,推荐了不同交通量等级下的再生路面典型结构组合。
The pavement cold recycled technology can effectively use waste, its conforms to thedevelopment concept of our our country sustainable development strategy of waste recycledand energy conservation and emissions reduction. At present, the asphalt pavement coldrecycled technology has not been formed a complete system,we still in the initial stage,it isdifferences from foreign in the test method, test means, design standard, pavementstructure.we study less in the structure response of recycled pavement. It is usually adoptsHMA pavement structure design method and pavement reconstruction design methods.theparameters volunme value solely rely on specification recommended, such designed pavementcan not meet the needs of the performance and the service life often shorter.
     Based on this, the article studyed the preserve modes and the design index of coldrecycled mixture design through the performance test and on-site validation methods, andproposes an emulsified asphalt cold recycled mixture preservation methods. And put forwardthe recycled mix design index that use the freezing and thawing and dry wet cleavage strengthand its intensity ratio as control index, and the voidage, Marshall stability as a referenceindex. According to the pavement damage type and degree, set up seven recycled pavementstructure and a kind of traditional maintenance pavement structure, through the actualpavement structure dynamic response analysis found that the temperature sensitivity ofstructure strain less than the hot mix asphalt pavement structure.the thickness of layer haslarge influence on the strain of thebottom of recycled layer; Along with the axial load andtemperature increases, recycled layer bottom tensile strain increases unceasingly, the higherthe temperature, the faster increasing of maximum strain;
     pavement thickness has large influence on the top surface stress of the layer under therecycled sturcture,and the speed has smaller affect According to the pavement structurestrain response,CRP3that the thickness of pavement structure is thinnest and its longitudinalstrain response is maximum, the longitudinal strain response from big to small order: CRP3(CRP4)> CRP5> CRP6> CRP1(CRP2)> CRP7, which CRP3and CRP4, CRP1and CRP2,CRP6and CRP8except cement different besides the others all the same, and be close to strainresponse function。
     Based on the measured dynamic pavement response and pavement material propertiestesting, analysis was conducted on the recycling pavement structure and interlayer contactconditions. Results showed that the strength of recycling pavement layer, the thickness ofasphalt layer and the state of interface contact conditions had significant impacts on pavementperformance. Material parameters of cold recycled pavement were put forward based ontheoretical calculations and measured data analysis, which will contribute to solve theproblem of the difference between theoretical calculations results and real values. Fatiguelimit of typical recycled asphalt mix was preliminarily determined based on laboratory fatiguetesting and test road for recycled mixtures. Typical recycled pavement structure underdifferent traffic levels was recommended based on laboratory testing and measured dynamicresponses of test road.
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