用于冬季过渡路面的下封层关键技术研究
发布时间:2018-04-08 12:46
本文选题:道路工程 切入点:下封层 出处:《长沙理工大学》2014年硕士论文
【摘要】:下封层作为冬季过渡路面用时的功能性与仅作为下封层功能层时不同。现有设计方法尚不完善,本文重点研究同步碎石封层和沥青砂封层作为过渡路面用时的使用性能。为分期修建用下封层技术提供理论基础,利于推广过渡路面用下封层技术。本文从下封层常规使用性能和过渡路面用使用性能两方面出发,分析沥青类型、材料用量、级配设计、空隙率对性能的影响。下封层常规使用性能重点研究层间粘结性能,冬季过渡路面用使用性能包括抗磨耗性能和抗冻性能。下封层质量与设计因素和施工因素均有关,本文依托实体工程进行施工检测,提出下封层施工关键技术。同步碎石封层层间粘结性能研究时,采用斜剪试验方法,通过改变不同试验温度分析对其性能的影响。此外,综合分析了沥青用量、集料粒径、集料撒布率三个因素对性能的影响,为同步碎石封层的设计优化提供依据。结果表明层间粘结能力随集料粒径增大而减小,随沥青用量增加先增大后减小。沥青砂封层层间粘结性能研究时,分析了级配设计和沥青用量对性能的影响,为其矿料级配设计和沥青用量的选取提供了理论依据。结果表明矿料级配贴近正S型抗剪强度最佳,增大CA值,同时减小FAc值和粗细集料比可提高层间粘结。对下封层进行抗磨耗能力评价时,采用了磨耗式评价方法和冲击式评价方法。磨耗式评价根据Sweep Test试验原理,对稀浆混合料湿轮磨耗试验(T0752-2011)进行了改进,分析了材料组成对性能的影响。冲击式评价根据Vialit Test试验原理,对沥青与集料低温黏结性试验进行了改进,分析了沥青用量、集料粒径对同步碎石封层的影响。建议同步碎石下封层应增大沥青用量,减小集料粒径。对下封层抗冻性能进行评价时,同步碎石封层采用冻融后的冲击试验方法;沥青砂封层采用冻融后的低温弯曲试验方法。试验结果表明两种下封层类型均能满足冬季过渡路面用性能要求,并且沥青砂封层空隙率为4%时,沥青混合料抗冻性能最高。汇总全文研究成果,探讨了两种下封层技术的设计标准及其适用性。具体包含沥青用量、集料粒径、集料撒布率、级配设计、空隙率等因素的影响,本文提出了各参数的建议值,根据工程实际的气候和交通条件可进行调整。
[Abstract]:The function of the lower sealing layer as the winter transition pavement is different from that of the lower sealing layer.The existing design methods are not perfect. This paper focuses on the performance of synchronous gravel seal and asphalt sand seal as transitional pavement.This paper provides a theoretical basis for the construction of the lower layer by stages, which is conducive to popularizing the technology of the lower seal for the transition pavement.In this paper, the effects of asphalt type, material dosage, gradation design and void ratio on the performance of the undersealing layer and the transition pavement are analyzed from two aspects: the conventional performance of the undersealing layer and the performance of the transition pavement.The general performance of the undersealing layer is focused on the interlaminar bonding performance. The performance of the transition pavement in winter includes wear resistance and frost resistance.The quality of the lower sealing layer is related to the design and construction factors. The key technology of the construction of the lower seal layer is put forward based on the construction inspection of the solid engineering.In the study of bond property between layers of synchronous crushed stone seal, oblique shear test method was used to analyze the effect of different test temperature on its performance.In addition, the effects of asphalt content, aggregate particle size and aggregate distribution rate on the performance are comprehensively analyzed, which provides the basis for the design and optimization of the sealing layer of synchronous crushed stone.The results show that the interlaminar bonding ability decreases with the increase of aggregate particle size, and increases firstly with the increase of asphalt content and then decreases with the increase of asphalt content.The influence of gradation design and asphalt content on the performance of asphalt sand seal is analyzed, which provides a theoretical basis for the design of mineral aggregate gradation and the selection of asphalt content.The results show that the best gradation close to the positive S-type shear strength can increase the interlaminar bond by increasing the CA value and decreasing the FAc value and the ratio of coarse aggregate to fine aggregate.In the evaluation of the wear resistance of the lower sealing layer, the abrasion evaluation method and the impact evaluation method are adopted.According to the principle of Sweep Test test, the wet wheel wear test of slurry mixture (T0752-2011) was improved, and the influence of material composition on properties was analyzed.According to the principle of Vialit Test test, the impact evaluation improved the low temperature adhesion test between asphalt and aggregate, and analyzed the influence of asphalt content and aggregate particle size on the sealing layer of synchronous crushed stone.It is suggested that the amount of asphalt should be increased and the particle size of aggregate should be reduced.When evaluating the frost resistance of the lower seal layer, the impact test method after freeze-thaw was used for the synchronous gravel seal layer and the low-temperature bending test method was used for the asphalt sand seal layer.The test results show that the two types of lower sealing layer can meet the performance requirements of winter transition pavement, and the asphalt mixture has the highest frost resistance when the porosity of asphalt sand seal layer is 4.This paper summarizes the research results and discusses the design standards and applicability of two kinds of undersealing technology.It includes the influence of asphalt dosage, aggregate particle size, aggregate distribution rate, gradation design, void ratio and so on. This paper puts forward the suggested values of each parameter, which can be adjusted according to the actual climate and traffic conditions of the project.
【学位授予单位】:长沙理工大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U416.2
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