【作者】 吕大伟；

【导师】 郝培文；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2014， 博士

【摘要】 近年来，随着交通量和行车荷载的增加，我国早期修建的水泥砼路面破损严重，已不能适应经济快速发展的需要和社会公众对高速公路通行能力和舒适性的迫切要求，在旧水泥砼路面上加铺沥青混凝土面层是改善路面使用性能和延长路面使用寿命的常用措施。目前，虽然国内已对旧水泥砼路面上加铺沥青混凝土面层形成的复合式路面进行了一定研究，然而对这一复合路面的综合技术仍缺乏深入系统的研究。旧路病害处治不彻底、防治反射裂缝措施不合理、加铺层设计不完善等原因导致许多水泥混凝土路面沥青加铺工程使用效果不理想。本文从水泥混凝土路面沥青加铺层的材料组成与性能优化设计、复合式路面结构力学行为特性等角度出发，旨在通过大量室内外试验与检测以及理论分析，对水泥混凝土路面沥青加铺层的材料与结构设计进行系统深入的研究，以提高复合路面结构的综合使用性能，进而推动水泥混凝土路面沥青加铺层技术在我国的进一步发展和应用。采用压浆技术对水泥混凝土面板板底脱空进行有效处治是确保水泥混凝土路面沥青加铺层使用性能的重要前提。本文针对目前压浆技术存在的问题，对压浆浆液的配合比组成进行了试验研究，分析了浆液中的不同材料组分以及不同类型外加剂对浆液强度、流动性、粘度、膨胀率、泌水性等力学及使用性能的影响，在此基础上，总结了压浆浆液配合比设计的控制指标及技术标准，提出了压浆质量评价指标，为水泥混凝土路面板底压浆的设计及施工质量控制提供了指导。采用有限元软件研究了水泥混凝土路面沥青加铺结构的力学响应特性。分析了轴载、沥青加铺层厚度、应力吸收层模量等对水泥路面沥青加铺结构荷载应力和温度应力的影响。针对含有新型防反射裂缝结构的复合路面进行力学特性分析，结果表明：新型防反射裂缝结构可在一定程度上降低复合路面结构的荷载应力，显著减小复合路面结构的温度应力，从而有效预防复合路面温度型反射裂缝病害的发生。汕梅高速公路大修工程中的监测数据，验证了复合路面结构的实际力学性能变化规律，为高等级公路水泥砼路面沥青加铺层结构的优化设计提供了理论依据。依托梅河高速公路水泥混凝土路面沥青加铺工程，验证分析了层间处治措施对“黑白”界面粘结强度的影响。针对常规防水粘结层材料抗剪切强度不足的问题，研发了新型防水粘结层材料—PCMA，阐述了PCMA的作用机理，提出了相应的施工工艺及技术指标。工程应用及性能检测表明，该材料具有抗剪强度高、施工方便和不需要撒布碎石等优点。通过疲劳试验对比研究了三种沥青混合料类型以及玻璃纤维格栅、土工织物、SAMI层、聚酯纤维等四种防裂措施对水泥混凝土路面沥青加铺结构抗疲劳性能的影响，结合实体工程对不同防裂措施的效果进行了分析验证，结果表明：设置SAMI应力吸收层对提高沥青路面抗反射裂缝能力比较有效，掺加聚酯纤维的沥青混合料能有效提高抗反射裂缝能力。结合大量室内外试验，对比研究了具有不同PG等级沥青及不同矿料级配组成的沥青加铺层混合料路用性能。结果表明：PG82-10改性沥青混合料动稳定度比PG70-10改性沥青混合料提高一倍左右，疲劳寿命是PG70-10改性沥青混合料的两倍多。汕梅高速公路水泥混凝土路面沥青加铺工程通过使用PG82-10改性沥青、新型粘结层材料、新型防反射裂缝措施以及优化配比等创新措施，有效提高了薄层沥青罩面的路用性能，工程应用前景良好。更多还原

【Abstract】 In recent years, the early constructed cement concrete pavements have damagedseriously with the increase of traffic volume and load, failing to meet the urgent need for fastdevelopment of economy and public demand for traffic capacity and comfort of expressway.Cement concrete pavement with asphalt overlay (CCPAO) is a common used measure toimprove the pavement performance and extend the pavement life. A lot of domesticresearches have been carried out on CCPAO, however, there are still lacks of deep study onthe comprehensive technology of this compound pavement. Some factors, such as halfwaytreatment of old cement concrete pavement, unreasonable anti-crack measure, imperfection ofoverlay design method, etc, lead to unsatisfied performance of CCPAO. Considering theoptimization design of material composition and performance and the mechanicalcharacteristics of the compound pavement structure, this paper, through a lot of experimentsand theoretical analysis, focused on the study of the material and structure design of CCPAOand aimed to improve the comprehensive performance of the compound pavement so as toboost the development of this technology in China.Effective treatment of the gap under the concrete slab with grouting is an importantpremise to ensure the favorable performance of CCPAO. Aiming at the problems in groutingtechnology, this paper carried out experiments to study the composition design of groutingslurry. The influences of different material components and various types of admixture on themechanical and performance properties, such as grouting slurry strength, flowability, viscosity,expansion ratio, bleeding, ect. On base of that, the control indexes and technical specificationfor the composition design of grouting slurry and the quality evaluation indicators forgrouting were also proposed, which offer good guidance for the grouting design underconcrete slab.By using finite element analysis the mechanical behavior of CCPAO was studied. Theinfluences of traffic load, depth of asphalt overlay, modulus of stress absorbing layer on thestress and strain of CCPAO were analyzed. Additionally, the mechanical characteristics of thecompound pavement with a new type of reflection crack-resisting structure were studied. Theresults showed that the new type of reflection crack-resisting structure could decrease the loadstress of the compound pavement in a certain extent and could obviously decrease thetemperature stress of the compound pavement, thus in turn effectively preventing theappearance of reflection crack due to temperature change. By analyzing the monitoring datafrom ShanMei expressway maintenance project, the actual mechanical behavior laws of the compound pavement structure were verified, which offer theoretical base for the optimizationdesign of CCPAO.Depending on the CCPAO in Meihe expressway, the impacts of different types of interlaytreatments on the interfacial bond strength between the cement concrete pavement and theasphalt overlay were verified. Considering the insufficient anti-shear strength of commonbonding layer material, a new type of water proof and bonding material i.e. PCMA, wasdeveloped and the mechanism was illustrated. Additionally, the construction techniques andindexes were also put forward. Actual engineering application and performance determinationshowed that PCMA had the advantages of high anti-shear strength, convenient constructionand no need for spread of crushed stones.Using fatigue test, the influences of three types of asphalt mixtures and fourcrack-resisting measures, e.g. glass fiber grilling, geotextile, SAMI layer, and polyester fiber,on the fatigue performance of CCPAO were studied. Verification was also carried out for thedifferent crack-resisting measures with actual projects. The results showed that SAMI layermanifested superiority in terms of crack resistance of CCPAO and polyester fiber contributedto the improvement of crack resistance for asphalt mixture.The performance properties of asphalt mixtures using various PG grades and aggregategradations were studied with experiments. The results showed that the dynamic stability ofmixture with PG82modified asphalt was nearly double than that of mixture with PG70. Andthe fatigue life of the former one was two times greater than that of the latter one. By usingthe PG82modified asphalt, developed bonding material, new type of reflection crack-resistingmeasure and optimized mix design, the performance of the compound pavement in ShanMeiexpressway was effectively improved and the corresponding measures have good engineeringperspective.更多还原