共查询到19条相似文献,搜索用时 265 毫秒
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高速公路沥青路面的早期损坏与预防性养护 总被引:4,自引:0,他引:4
通过对高速公路沥青路面早期损坏原因的剖析,针对沥青路面开始阶段的早期损坏,浅析了积极开展高速公路沥青路面预防性养护的重要性及技术措施,通过预防性养护争取延长大修周期、避免重建,延长使用寿命,最大限度地减少了维修养护的总成本。 相似文献
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布敦岩沥青及混合料路用性能的试验和研究 总被引:2,自引:0,他引:2
为了解布敦岩沥青的性质和布敦岩沥青混合料路用性能,分别对布敦岩沥青和混合料路用性能进行了试验。结果表明:掺加天然岩沥青对基质沥青进行改性,可以提高沥青路面的高温抗车辙性能、抗水损坏性能、抗老化性能和混合料的强度,适合在夏天炎热和潮湿多雨的南方气候的高速公路及其它公路沥青路面中应用,并简要介绍云梧高速公路试验路应用情况。 相似文献
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详细叙述了微表处技术在现代高速公路养护中的应用,通过室内试验和施工证明, 采用微表处技术可有效地防止路面水下渗和修复车辙等早期病害。 相似文献
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浅议高速公路沥青路面层间粘层油施工质量控制 总被引:1,自引:0,他引:1
高速公路沥青路面早期损坏的原因之一是沥青层间界面不连续,因此提高沥青面层层间连接性能是提高沥青路面质量的有效途径,简述了沥青面层粘层油施工技术和质量控制措施,为沥青面层施工提供有益的借鉴。 相似文献
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沥青路面车辙预估方法介绍 总被引:6,自引:0,他引:6
车辙是沥青路面在交通荷载反复作用下产生的竖向永久变形的积累,是路面的主要损坏形式之一.在分析了车辙形成机理和影响因素的基础上,对现有永久变形的预测方法进行了比较.为今后提出更准确的预测模型以及沥青路面的设计提供了参考. 相似文献
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《石油沥青》2021,(4)
为解决沥青路面在高温多雨、车辆重载的环境条件下,易产生早期水损害和车辙病害等问题,引入了一种改善沥青砼路面的抗水损、抗车辙性能以及提高施工和易性的多功能改性剂。采用SEM和DSC微观方法以及黏温曲线对多功能沥青改性剂的作用机理进行分析,通过马歇尔试验、车辙试验及冻融劈裂试验对多功能改性沥青混合料的高温稳定性及水稳定性进行了评价,并与SBS改性沥青混合料进行路用性能试验比较。研究表明:多功能改性剂由于分子链较短,密度较大,更能均匀分散于沥青中,且与沥青形成整体性网络结构,显著改善了沥青混合料的高温稳定性能和水稳定性能,从而提高复杂环境下沥青路面的使用寿命和服役水平。 相似文献
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沥青路面车辙产生机理 总被引:17,自引:0,他引:17
车辙是渠化交通的高等级公路沥青路面的主要损坏类型之一,车辙的存在缩短了路面的使用寿命,降低了道路的服务质量。首先对车辙的影响因素进行了简要分析,通过路面温度场的观测进一步证实了车辙主要发生于路表下10 cm的范围内。同时,系统的总结了前人对沥青路面车辙机理的认识,认为车辙主要来源为沥青混凝土的剪切流动变形。力学分析的结果表明传统上对车辙产生的原因往往只归于材料因素,实际上不同路面结构在行车荷载作用下所产生的剪应力有很大差异,路面结构类型对车辙也有重要影响。 相似文献
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道路沥青混凝土面层早期水损坏是公路病害中常见的一种现象。作为处理早期病害的措施,改性乳化沥青稀浆封层技术(即微表处技术)能很好的处理各种坑槽、网裂和车辙等问题,值得推广。 相似文献
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高等级公路沥青路面出现早期车辙的现象十分普遍,应该引起人们的关注。结构性车辙主要是由于施工时未充分压实、压实标准偏低、集料级配偏细以及超载交通过多所致;而失稳性车辙则主要是由于所用沥青粘度偏低和沥青用量偏多造成的。提出在沥青路面设计、施工和管理的各个环节应采取相应的对策措施。 相似文献
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为使改性沥青的技术性能有所提高,在工程应用中既能增加其路用性能,减少路面易产生的车辙、开裂、坑槽等早期破坏,又能减少养护次数,节省工程费用,进行了改性沥青配方的设计优化。从基质沥青与改性剂的配伍性、改性沥青的热储存稳定性和改性沥青的性能三大方面进行研究,通过在选取的三种AH-70重交石油沥青中掺加三种SBS改性剂(YH761、YH791-H、道改2号)和两种稳定剂(wdj、WT),对改性沥青的主要技术性能指标(针入度指数、软化点、5℃延度等)进行综合比选,从而得出每种基质沥青最适合的改性剂和稳定剂及其最佳掺配量,使改性沥青性能最优,可从根本上解决沥青面层高、低温稳定性和局部损坏等问题,从而延长路面使用寿命。 相似文献
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Moisture-induced damage in petroleum asphalt pavements, which results in a loss of pavement tensile strength, is a significant contributor to pavement performance problems such as rutting, shoving, flushing and cracking. Results of the present study provide fundamental information on some of the chemistries of moisture-induced damage. Model compounds containing polar chemical functional group types found in asphalts were used to simulate the adsorption-water displacement characteristics of asphalt molecules on mineral aggregate surfaces. A comparative and interpretative discussion of the model compound studies and earlier studies on actual asphalt-aggregate mixtures is presented. Carboxylic acids were confirmed as the functional type most strongly adsorbed on most mineral aggregate surfaces; however, they were also the functional type most easily water displaced. Pyridine-type functionality similar to that found in asphalts reduced the sensitivity of asphalt-aggregate mixtures to moisture damage. Results suggest that prior treatment of aggregates with antistripping agents rather than their prior addition to the asphalts should improve the moisture resistance of mixtures. The reaction of carboxylic acids with aggregate surfaces prior to the reaction of the aggregate surfaces with pyridine-type functionality greatly increased the sensitivity of the pyridine types to displacement by water. Also, the reaction of pyridine with carboxylic acid functionalities prior to their adsorption on aggregate surfaces also increased their sensitivity to water displacement. Results of the model compound studies provided further interpretation of the results of earlier fundamental studies on the adsorption and water displacement characteristics of actual asphalt components from aggregates typically used in paving mixtures. Results are interpreted with regard to their usefulness in finding pragmatic solutions to pavement pavement moisture damage problems. Further needed research is also suggested. 相似文献
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Hamzeh F. Haghshenas Robert Rea Davoud F. Haghshenas 《Petroleum Science and Technology》2013,31(22):2275-2282
AbstractAging can significantly reduce the durability of binders used in asphalt pavements and can consequently impose long-term maintenance cost to the owners. Antioxidants are additives that can be used to hinder oxidation and hardening of petroleum asphalt binders. In this study, the effect of zinc diethyldithiocarbamate (ZnDEC) as an antioxidant on chemical and rheological features of the binder were evaluated and monitored during laboratory aging process. The results indicated that not only ZnDEC can retard the aging process, but it also improves the low- and mid-temperatures cracking resistance without negatively affecting the rutting performance of the binder. 相似文献
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The authors aimed to determine the functional properties of binders and asphalt-mixtures modified with a liquid nano-organosilane additive. Hence, conventional and rheological tests of bitumen, Fourier transform infrared spectroscopy, and resilient modulus using indirect tensile test were applied. The results indicated that although this silane-based additive creates a hydrophobic layer over the surface of aggregates, which significantly improve the resistance of asphalt-mixtures against water damage; it has inconsiderable effect on rutting, fatigue, and elastic-response properties of both binders and asphalt mixtures. Furthermore, effect of it on low-temperature cracking of binders is still open for discussion. 相似文献