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  本文選題：瀝青混合料　切入點：動態(tài)模量　出處：《長沙理工大學》2015年碩士論文

【摘要】：路面結(jié)構(gòu)在服役過程中受到來自車輛、環(huán)境等各種因素的綜合作用。無論是車輛荷載還是溫度交替,都是一個不斷變化的動態(tài)過程。瀝青路面采用的瀝青混合料是一種典型的粘彈性材料,力學性能對溫度和頻率的變化非常敏感,在動態(tài)荷載作用下和在靜態(tài)荷載作用下所表現(xiàn)出的力學響應(yīng)是十分不同的。目前,國際上普遍采用路面結(jié)構(gòu)和路面材料的動態(tài)分析方法,動態(tài)模量作為重要的設(shè)計參數(shù)已經(jīng)納入到AASHTO-2002等設(shè)計方法中。因此,基于我國的現(xiàn)實情況,對瀝青混合料的動態(tài)模量進行研究具有十分重要的意義。目前,對于動態(tài)模量的研究試驗方法很多。兩點彎曲(two-point bending)試驗方法對試件的作用既有彎拉也有剪切,比較符合路面結(jié)構(gòu)的實際受力狀態(tài)。本文參考歐洲標準,采用法國M2F梯形梁設(shè)備對瀝青混合料進行兩點彎曲試驗研究。并與SPT(Simple Performance Tester)動態(tài)模量試驗方法進行了比對研究。首先在調(diào)查了國內(nèi)外動態(tài)模量研究現(xiàn)狀的情況下對動態(tài)模量的概念進行了闡述,對動態(tài)模量的室內(nèi)外試驗研究方法做了梳理;對瀝青混合料的粘彈性原理、時溫等效、主曲線等進行了介紹。采用M2F梯形梁設(shè)備進行動態(tài)模量試驗,在不同的溫度、荷載頻率和應(yīng)變水平下對四種SAC16級配的瀝青混合料進行了室內(nèi)試驗研究。分析了動態(tài)模量的影響因素,包括溫度、頻率、瀝青材料、級配等,繪制了動態(tài)模量的主曲線;將應(yīng)變水平作為影響動態(tài)模量的影響因素,回歸了動態(tài)模量二元方程表達式,繪制了主曲面,發(fā)現(xiàn)應(yīng)變水平是影響瀝青混合料動態(tài)模量的重要因素。得到了這幾種常用瀝青混合料的動態(tài)模量值范圍。使用SPT對瀝青混合料進行了動態(tài)模量試驗,分析了動態(tài)模量的影響因素,繪制了動態(tài)模量主曲線�；趦煞N試驗方法的試驗數(shù)據(jù),從試驗原理和操作過程出發(fā),對M2F和SPT兩種試驗方法得到的動態(tài)模量進行比對分析,從而對兩種試驗方法進行評價:對以受壓為主的上面層瀝青混凝土材料建議使用SPT;對受彎拉作用為主的中下面層,建議使用梯形梁試驗進行研究。
[Abstract]:Pavement structure is affected by various factors, such as vehicle, environment and so on. Whether it is vehicle load or temperature alternation, The asphalt mixture used in asphalt pavement is a typical viscoelastic material, and its mechanical properties are very sensitive to the change of temperature and frequency. The mechanical response under dynamic load and static load is very different. At present, dynamic analysis methods of pavement structure and pavement materials are widely used in the world. As an important design parameter, dynamic modulus has been incorporated into the design method of AASHTO-2002. Therefore, based on the reality of our country, it is very important to study the dynamic modulus of asphalt mixture. At present, it is very important to study the dynamic modulus of asphalt mixture. There are many research and test methods for dynamic modulus. The effect of two-point bending test method on the specimen is both flexural and shearing, which accords with the actual stress state of pavement structure. In this paper, we refer to the European standard. The two-point bending test of asphalt mixture was carried out by using French M2F trapezoidal beam equipment, and was compared with the dynamic modulus test method of SPT(Simple Performance Tester. Firstly, the present situation of dynamic modulus research at home and abroad was investigated. The concept of dynamic modulus is expounded. In this paper, the indoor and outdoor test methods of dynamic modulus are combed, and the viscoelastic principle, time-temperature equivalence and main curve of asphalt mixture are introduced. The dynamic modulus test is carried out with M2F trapezoidal beam equipment at different temperatures. Four kinds of asphalt mixtures with SAC16 gradation were tested at loading frequency and strain level. The influencing factors of dynamic modulus, including temperature, frequency, asphalt material and gradation, were analyzed, and the main curves of dynamic modulus were drawn. The strain level is taken as the influencing factor of dynamic modulus, and the expression of binary equation of dynamic modulus is regressed, and the principal surface is drawn. It is found that the strain level is an important factor affecting the dynamic modulus of asphalt mixture. The range of dynamic modulus of these common asphalt mixtures is obtained. The dynamic modulus of asphalt mixture is tested by SPT. The influencing factors of dynamic modulus are analyzed, and the main curve of dynamic modulus is drawn. Based on the test data of two kinds of test methods, the dynamic modulus obtained by M2F and SPT is compared and analyzed according to the test principle and operation process. Therefore, two test methods are evaluated: SPT is recommended for asphalt concrete materials under compression, and trapezoid beam test is recommended for the middle and lower layers under flexural tension.
【學位授予單位】：長沙理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U414

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本文編號：1668775