本文關(guān)鍵詞：基于X-ray CT瀝青混合料細觀結(jié)構(gòu)及力學(xué)性能研究　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 瀝青混合料 細觀結(jié)構(gòu) X-ray CT技術(shù) 數(shù)字圖像處理技術(shù) 骨架結(jié)構(gòu) 力學(xué)性能

【摘要】：當(dāng)前的瀝青混合料設(shè)計法基本上仍是沿用傳統(tǒng)的實驗-觀察的現(xiàn)象學(xué)經(jīng)驗方法，傳統(tǒng)研究方法雖為世界道路行業(yè)的進步做出了巨大貢獻，但現(xiàn)在已經(jīng)逐漸無法滿足工程需要。究其原因，傳統(tǒng)方法未從根本上揭示瀝青混合料內(nèi)部結(jié)構(gòu)特征對宏觀性能的影響關(guān)系，從而出現(xiàn)了統(tǒng)計指標（諸如級配、瀝青用量、空隙率等）相同而各試件性能有較大差異的情況。隨著交叉學(xué)科在路面工程中的不斷滲透和研究手段的不斷豐富，，越來越多的學(xué)者開始致力于研究瀝青混合料細觀分布規(guī)律（顆粒及空隙空間分布）、瀝青與集料微觀交互作用能力及其對混合料宏觀性能的影響，并取得了大量有價值的研究成果。 本文針對瀝青混合料細觀結(jié)構(gòu)與其力學(xué)性能的相關(guān)性問題開展研究，建立基于X-ray CT斷層掃描技術(shù)及數(shù)字圖像處理技術(shù)的瀝青混合料細觀組成、結(jié)構(gòu)分布特征指標體系，建立分析瀝青混合料細觀組成、結(jié)構(gòu)的定性及定量方法，描述瀝青混合料骨架結(jié)構(gòu)形式，及其與力學(xué)性能的相關(guān)性，克服以往宏觀研究的限制，從細觀尺度上進行剖析。本文主要的研究內(nèi)容及成果概括如下： 首先，基于德國Phoenix v|tome|x s微焦點工業(yè)CT掃描系統(tǒng)，尋求不同情況下瀝青混合料試件的最優(yōu)掃描參數(shù)配置；采用“等效體積”法，通過對“標準物質(zhì)”的掃描并進行空隙體積計算，驗證CT體積重構(gòu)的準確性。在最佳參數(shù)配置下，進行差異性物質(zhì)的分離，為后續(xù)分析奠定基礎(chǔ)。 其次，采用X-ray CT無損掃描對不同級配類型（AC-16、SMA-16、OGFC-16）、成型方式（Marshall擊實與SGC旋轉(zhuǎn)壓實）、不同壓實度下瀝青混合料試件進行掃描，利用VGStudio MAX2.2軟件研究了空隙在瀝青混合料中橫向、縱向的分布規(guī)律，揭示了空隙在瀝青混合料中的不均勻分布的特性。 隨后，采用數(shù)字圖像處理技術(shù)，利用Matlab程序平臺，對二維圖像的集料的形態(tài)特性以及集料組成分布特性進行分析，并采用統(tǒng)計模型對其分布進行擬合；結(jié)合數(shù)學(xué)中的分形理論，對不同級配、不同成型方式及不同壓實度下的瀝青混合料試件的連續(xù)截面幾何信息進行了研究。 再次，對于瀝青混合料的骨架特性，分別從宏觀、細觀進行分析對比；采用Matlab圖像處理模塊，結(jié)合散體力學(xué)理論，通過對集料骨架接觸算法進行設(shè)計，對沿高度方向的集料接觸點數(shù)量進行統(tǒng)計分析。 最后，建立了瀝青混合料內(nèi)部細觀結(jié)構(gòu)與其宏觀力學(xué)性能之間的聯(lián)系。采用劈裂試驗方法評價力學(xué)性能，并采用數(shù)字散斑DIC技術(shù)對不同細觀結(jié)構(gòu)下的試件破壞模式與應(yīng)變場的均勻性進行分析；并利用PFC-2D軟件對不同結(jié)構(gòu)類型瀝青混合料進行受力模擬，驗證骨架接觸的重要性；結(jié)合灰關(guān)聯(lián)理論，分析了細觀指標對其力學(xué)性能影響程度的敏感性。
[Abstract]:The current asphalt mixture design method is still using the traditional experiment-observation phenomenological experience method, although the traditional research method has made great contribution to the progress of the world road industry. But now it has been unable to meet the needs of the project. The traditional method has not fundamentally revealed the impact of the internal structural characteristics of asphalt mixture on the macro-performance of the relationship, thus the emergence of statistical indicators (such as gradation. With the continuous penetration of cross-disciplinary in pavement engineering and the continuous enrichment of research means, the asphalt content, porosity, etc.) are the same and the performance of each specimen has great difference. More and more scholars have begun to study the micro-distribution of asphalt mixture (particle and void space distribution, asphalt and aggregate micro-interaction ability and its impact on the macro performance of the mixture. A large number of valuable research results have been obtained. In this paper, the relationship between the microstructure of asphalt mixture and its mechanical properties is studied, and the microstructure of asphalt mixture based on X-ray CT tomography and digital image processing is established. The index system of structural distribution characteristics is established to analyze the mesoscopic composition of asphalt mixture, the qualitative and quantitative methods of structure, and to describe the structure form of asphalt mixture skeleton and its correlation with mechanical properties. In order to overcome the limitations of previous macro research and analyze from the meso scale, the main contents and achievements of this paper are summarized as follows: Firstly, based on Phoenix v tome x s microfocus industrial CT scanning system in Germany, the optimal scanning parameter configuration of asphalt mixture specimen under different conditions is sought. The accuracy of CT volume reconstruction was verified by "equivalent volume" method by scanning the "standard material" and calculating the void volume. Under the optimal parameter configuration, the difference material was separated. To lay a foundation for subsequent analysis. Secondly, X-ray CT nondestructive scanning was used to compare the different grading types of AC-16 SMA-16 / OGFC-16). The molding method is SGC compaction and SGC rotary compaction, and the asphalt mixture specimens are scanned under different compaction degrees. The transverse and longitudinal distribution of void in asphalt mixture is studied by VGStudio MAX2.2 software, and the characteristics of uneven distribution of void in asphalt mixture are revealed. Then, using the digital image processing technology and the Matlab program platform, the morphology characteristics and the aggregate composition distribution characteristics of the two-dimensional image are analyzed. The statistical model is used to fit the distribution. Based on the fractal theory in mathematics, the geometric information of continuous section of asphalt mixture specimens with different gradation, different molding methods and different compaction degree is studied. Thirdly, the skeleton characteristics of asphalt mixture are analyzed and compared from macro and meso. By using Matlab image processing module and the theory of bulk mechanics, the contact algorithm of aggregate skeleton is designed, and the number of aggregate contact points along the height is analyzed statistically. Finally, the relationship between the internal meso-structure of asphalt mixture and its macroscopic mechanical properties is established. The splitting test method is used to evaluate the mechanical properties. Digital speckle DIC technique is used to analyze the failure mode and the uniformity of strain field of specimens with different mesoscopic structures. PFC-2D software is used to simulate the stress of different structural types of asphalt mixture to verify the importance of skeleton contact. Based on the grey correlation theory, the sensitivity of meso-index to its mechanical properties is analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U414

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