【作者】 陈博；

【导师】 郑南翔；

【作者基本信息】 长安大学 ， 材料学， 2011， 硕士

【摘要】 伴随我国高速公路的迅猛发展,很多沥青路面没有达到设计寿命就出现的诸多病害,严重影响车辆行驶质量。科学合理的预防性养护,既能有效提高路面的整体服务水平,又可以延长路面大、中修的到来,合理利用养护资金延长道路的使用寿命。大多数地方的高速、一级公路,都是通过罩面施工来恢复路面的使用功能。但是在技术上主要是采用AC(热拌密实型沥青混合料)来作为罩面材料。本研究提出一种最大公称粒径为7.1mm的STOC沥青混合料,这种细粒式的STOC混合料在我国的新规范中也未提及。这种小粒径的混合料可以大大降低路面加铺层的厚度,作为一种超薄罩面材料可以广泛的应用到预防性养护中。经过探索得出,STOC能设计出间断骨架密实结构,具有良好的高温稳定性能和低温抗裂性能。本研究以甘肃省沥青路面养护超薄罩面关键技术为支撑,充分考虑当地自然、交通条件,对最大公称粒径7.1mm的细粒式STOC展开讨论,论文只要探讨集料、矿料级配、混合料的设计方法、超薄罩面的层间粘结和抗剪性能以及路用指标等。先介绍了国内外关于小粒径SMA的结构特性。其次提出了STOC型混合料的级配范围,STOC沥青混合料以2.36mm筛孔为粗、细集料的分界点,并提出这个关键筛孔的通过率范围为20%～35%。在使用传统马歇尔设计方法确定最佳油石比的基础上,又引入了力学指标SCB,有效避免了材料与结构设计的脱节。通过室内车辙试验、复合试件车辙试验、手工铺砂法测构造深度、渗水试验来检验STOC的路用性能。并通过查阅了大量文献资料,综合现有资料阐述了STOC型混合料的适用性以及可以作为预防性养护中的一种重要措施。最后,论文还通过BISAR软件分析了超薄罩面层的层间剪应力,得出了层间连续接触的情况下最大剪应力较小,通过高温剪切试验优选层间粘结材料为LJT,LJT的综合性能比环氧沥青和SBS改性沥青更为优越,并通过拉拔试验验证了其抗拉强度。更多还原

【Abstract】 Express way constructions are gaining momentum rapidly in recent years in China, which meanwhile gave rise to a specific phenomenon that ignoring quality for the purpose of achieving quantity. Many asphalt pavements generated road lots of disease harm long before arriving at designed life expectancy; those problems have bad effects on vehicles driving on. Scientific and reasonable preventive maintenance, not only could effectively enhance the pavement whole service level, but also postpone big and medium restorations, and make fully use of maintenance funds to prolong the road life expectancy. The major method used to restore pavement function in express ways and arterial road in most places is surface construction, but technologically mainly adopt AC as overlay materials. The essay research brings out a SMA asphalt mixture which has nominal maximum aggregate size of 7.1mm. This STOC mixture is not mentioned in China new code. This kind of micro-size particles mixture would greatly decrease road overlay thickness; it is an ultra-thin overlay materials which would extensively applied in preventive maintenance. Through researching, the essay concludes that STOC could design discontinuous skeleton dense texture, and have the properties of high-temperature stability and low temperature crack resistance.The research took Gan Su province asphalt pavements maintenance ultra-thin overlay key technology as research facts support; fully considers the local nature, communication conditions, to discuss the 7.1mm nominal maximum aggregate size SMA mixture. The essay discussed following problems:aggregates, aggregate gradation, mixture design methods, ultra-thin overlay, interlayer bonding, shear behavior, and road indexes. I firstly introduce traditional foreign and domestic reference about micro-size particles SMA structure properties. Secondly the essay brings out gradation range of STOC mixture and that STOC asphalt mixture’s coarse and fine gradation dividing point is 2.36mm screen aperture, meanwhile define this key screen aperture passing rate range is between 20% and 35%. The research is using traditional Marshall design methods so as to find the optimal asphalt-aggregate ration, then introduce into mechanical index(SCB) SCB, which effectively avoid disconnection between materials and structure design. Through indoor rutting experiment, compound specimen rutting experiment, manual sand spreading method of measuring structure deepness, and seepage test, the research aims to test STOC pavement performance.I looked up massive references, concluded STOC mixture applicability and that it could be an important method as preventive maintenance measures. Finally, the essay analyzes ultra-thin overlay shear stress through BISAR software, comes to the conclusion:when interlayer is continuously contact, the maximum shear stress is less. Through high temperature shear test, pick LJT as the optimal interlayer bonding material. LJT’s comprehensive performance is better than epoxy asphalt and SBS modified asphalt and its tensile strength was testified by pull-out test.更多还原