【摘要】：瀝青穩(wěn)定碎石作為路面結(jié)構(gòu)的下面層是最容易發(fā)生離析的層位,也是離析差異性最顯著的層位,作為瀝青路面中主要的承力層和傳力層,其質(zhì)量好壞對結(jié)構(gòu)整體的路用性能有著重要的影響。分析不同施工因素、研究離析對瀝青穩(wěn)定碎石路用性能的影響、提出不同性能下離析的控制指標(biāo)、分析不同環(huán)境下的應(yīng)力變化、定量計算離析的性能損失以及介紹離析的施工控制技術(shù)等內(nèi)容,對控制瀝青混合料的離析,延長瀝青路面的服務(wù)壽命具有重要現(xiàn)實意義。首先,研究了河南商蘭高速一段瀝青穩(wěn)定碎石路面進行了離析調(diào)查,從施工水平對其研究后發(fā)現(xiàn)和針對同一配合比,施工單位的施工水平是瀝青穩(wěn)定碎石級配離析的重要影響因素;在施工水平一定的情況下,瀝青穩(wěn)定碎石自身配比也是級配離析的重要影響因素。其次,本文在室內(nèi)試驗環(huán)境條件下從混合料離析后的級配角度出發(fā),通過設(shè)計混合料的不同級配離析值表征集料的離析狀況,進而將成型后的試件進行高溫、低溫、水損、疲勞、力學(xué)強度等方面的性能測試,以評價離析對瀝青穩(wěn)定碎石材料路用特性的影響。研究發(fā)現(xiàn),在高溫季節(jié)重載預(yù)防泛油,以控制細集料的重度離析的區(qū)域為主,預(yù)防車轍病害以控制細集料的中度離析極其以上等級的離析;在低溫環(huán)境下預(yù)防低溫開裂,須將粗集料的中度離析的作為控制指標(biāo);在多雨地區(qū)預(yù)防水損害,建議對粗集料中度離析區(qū)域加以嚴(yán)格控制。然后,利用Abaqus有限元設(shè)計軟件的數(shù)據(jù)分析處理功能,分別對道路結(jié)構(gòu)層在持續(xù)靜載、溫度場、溫荷耦合場的三種環(huán)境條件下進行受力模擬。借鑒AI設(shè)計原理,提出表征離析對結(jié)構(gòu)影響的損失計算方法。研究發(fā)現(xiàn):瀝青穩(wěn)定碎石離析對下面層影響最大,特別在是粗集料中度離析時,下面層結(jié)構(gòu)可能發(fā)生損傷破壞。下面層粗離析類別下的粗輕度、粗中度、粗重度的性能率依次損失27.8%,50.1%,87.1%。最后,從配合比設(shè)計驗證、瀝青混合料的生產(chǎn)、儲存運輸、攤鋪和碾壓各個階段提出了控制瀝青混合料離析的技術(shù)和手段,研究成果對提升瀝青路面質(zhì)量具有重要意義。
[Abstract]:Asphalt stabilized macadam, as the lower layer of pavement structure, is the most prone to segregation, and also the most distinct layer of segregation, as the main bearing layer and force transfer layer in asphalt pavement. The quality of the structure has an important impact on the overall road performance. This paper analyzes different construction factors, studies the influence of segregation on pavement performance of asphalt stabilized macadam, puts forward the control index of segregation under different performance, and analyzes the stress changes in different environments. The quantitative calculation of the performance loss of segregation and the introduction of construction control technology of segregation have important practical significance for controlling the segregation of asphalt mixture and prolonging the service life of asphalt pavement. First of all, the segregation investigation of asphalt stabilized macadam pavement of Shanglan Expressway in Henan Province was carried out, and the same mix ratio was found from the study of construction level. The construction level of the construction unit is an important factor affecting the gradation and segregation of asphalt stabilized macadam. In the case of certain construction level, the ratio of asphalt stabilized macadam itself is also an important factor of gradation segregation. Secondly, from the point of view of gradation after segregation of mixture, this paper designs the segregation status of materials in the different gradation table of mixture under the condition of indoor test environment, and then carries out high temperature, low temperature and water loss of the formed specimen. In order to evaluate the influence of segregation on pavement characteristics of asphalt stabilized macadam, fatigue and mechanical strength were tested. It is found that the prevention of flooding oil in high temperature season is mainly in the area of controlling heavy segregation of fine aggregates and the prevention of rutting diseases is to control the moderate segregation of fine aggregates and the segregation of more than the grade of fine aggregates. The moderate segregation of coarse aggregate should be taken as the control index in low temperature environment, and the prevention of water damage in rainy area should be strictly controlled in the area of moderate segregation of coarse aggregate. Then, using the data analysis and processing function of Abaqus finite element design software, the forces of road structure layer are simulated under three kinds of environment conditions: continuous static load, temperature field and temperature load coupling field respectively. Based on the design principle of AI, a loss calculation method to characterize the effect of segregation on structure is proposed. It is found that the segregation of asphalt stabilized macadam has the greatest influence on the lower layer, especially when the coarse aggregate is moderately segregated, the structure of the lower layer may be damaged and destroyed. Under the coarse segregation category, the performance rate of coarse light, coarse medium and coarse gravity in turn lost 27.8% and 50.1% and 87.1% respectively. Finally, the technology and means of controlling the segregation of asphalt mixture are put forward from the aspects of mix design verification, production, storage and transportation of asphalt mixture, spreading and rolling. The research results are of great significance to improve the quality of asphalt pavement.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

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本文編號：2367073