發(fā)布時間：2018-04-08 12:46

  本文選題：道路工程　切入點：下封層　出處：《長沙理工大學》2014年碩士論文

【摘要】：下封層作為冬季過渡路面用時的功能性與僅作為下封層功能層時不同�，F(xiàn)有設計方法尚不完善,本文重點研究同步碎石封層和瀝青砂封層作為過渡路面用時的使用性能。為分期修建用下封層技術提供理論基礎,利于推廣過渡路面用下封層技術。本文從下封層常規(guī)使用性能和過渡路面用使用性能兩方面出發(fā),分析瀝青類型、材料用量、級配設計、空隙率對性能的影響。下封層常規(guī)使用性能重點研究層間粘結性能,冬季過渡路面用使用性能包括抗磨耗性能和抗凍性能。下封層質量與設計因素和施工因素均有關,本文依托實體工程進行施工檢測,提出下封層施工關鍵技術。同步碎石封層層間粘結性能研究時,采用斜剪試驗方法,通過改變不同試驗溫度分析對其性能的影響。此外,綜合分析了瀝青用量、集料粒徑、集料撒布率三個因素對性能的影響,為同步碎石封層的設計優(yōu)化提供依據。結果表明層間粘結能力隨集料粒徑增大而減小,隨瀝青用量增加先增大后減小。瀝青砂封層層間粘結性能研究時,分析了級配設計和瀝青用量對性能的影響,為其礦料級配設計和瀝青用量的選取提供了理論依據。結果表明礦料級配貼近正S型抗剪強度最佳,增大CA值,同時減小FAc值和粗細集料比可提高層間粘結。對下封層進行抗磨耗能力評價時,采用了磨耗式評價方法和沖擊式評價方法。磨耗式評價根據Sweep Test試驗原理,對稀漿混合料濕輪磨耗試驗(T0752-2011)進行了改進,分析了材料組成對性能的影響。沖擊式評價根據Vialit Test試驗原理,對瀝青與集料低溫黏結性試驗進行了改進,分析了瀝青用量、集料粒徑對同步碎石封層的影響。建議同步碎石下封層應增大瀝青用量,減小集料粒徑。對下封層抗凍性能進行評價時,同步碎石封層采用凍融后的沖擊試驗方法；瀝青砂封層采用凍融后的低溫彎曲試驗方法。試驗結果表明兩種下封層類型均能滿足冬季過渡路面用性能要求,并且瀝青砂封層空隙率為4%時,瀝青混合料抗凍性能最高。匯總全文研究成果,探討了兩種下封層技術的設計標準及其適用性。具體包含瀝青用量、集料粒徑、集料撒布率、級配設計、空隙率等因素的影響,本文提出了各參數的建議值,根據工程實際的氣候和交通條件可進行調整。
[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.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.2

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本文編號：1721697