以计算流体动力模型模拟沥青胶浆之质流行为.pdfVIP

德霖學報「第 25 期」 2011 年 6月 以計算流體動力模型模擬瀝青膠漿之質流行為 以計算流體動力模型模擬瀝青膠漿之質流行為 林樹豪 德霖技術學院營建科技系助理教授 摘要 對於鋪面材料工程師而言，瀝青和瀝青膠漿，即瀝青－填縫料系統，的高溫質流行為是一重要的工 程性質。鋪面材料工程師需要了解填縫料對瀝青黏度的影響，並確保填縫料顆粒能均勻分散於其間。目 前工程界普遍使用旋轉式黏度儀來量測瀝青膠漿的高溫質流性質。過去的研究顯示使用旋轉式黏度儀量 測時，試驗期間瀝青膠漿的黏度有大量變化的情形。本研究使用計算流體動力模型，對旋轉式黏度儀進 行數值模擬。藉由此一強大的數值技術和複雜的質流模式，將瀝青膠漿中假塑性和觸變性等不同的效應 予以區隔。除此之外，填縫料顆粒移動的效應也予以界定和模型化。研究顯示使用適當的計算流體動力 模型能夠量化和模擬上述這些重要的效應，且旋轉式黏度儀所使用的傳統穩態流黏度方程式並不能適用 於含有填縫料的瀝青膠漿。 關鍵詞：質流行為、瀝青膠漿、計算流體動力模型、旋轉式黏度儀。 Computational Fluid Dynamic Modelling of the Rheological Behavior of Asphalt Mastic Shu-Hao Lin Assistant Professor, Department of Construction Technology, De Lin Institute of Technology Abstract It is important to the asphalt technologist to understand the effect the fillers have on the viscosity of the hot asphalt and to ensure even distribution of the filler particles within the mastic. One of the instruments used to quantify the high temperature rheological behavior of asphalt and asphalt-filler mixtures is the rotational viscometer. Previous research has identified substantial changes in the viscosity with time of both the pure asphalt and the asphalt-filler mastic when measured by the rotational viscometer. This study uses Computational Fluid Dynamics (CFD) to model behavior of the pure asphalt and asphalt-filler mastic in the viscometer. By means of complex rheological models, the pseudoplastic and thixotropic nature of the asphalt binder is identified and successfully modeled. In addition, the effect of filler drift is identified and modeled. It has been shown that the CFD model can quantify an