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    【硅酸鹽建筑材料國家重點實驗室】Characterization and Identification of Bitumen with the Modification of Montmorillonite Nanoclay

    發布時間:2012-02-17 字體:[增加 減小]
    學術報告

     

     

    報告主題:Characterization and Identification of Bitumen with the Modification of Montmorillonite Nanoclay

    時間:2012年2月10日上午9:30

    地點:硅酸鹽建筑材料國家重點實驗室北樓406室

     

    主講人:劉剛,博士,2007年開始在荷蘭代爾夫特理工大學(Delft University of Technology)道路與鐵路工程系(Road and Railway Engineering Section)攻讀博士學位,于2011年12月獲得博士學位,目前在該校從事博士后研究工作。劉剛博士的主要研究領域為納米改性瀝青,該項技術被用來改善瀝青路面的耐久性。

     

    內容簡介:Montmorillonite (Mt) nanoclay is a layered silicate mineral with a 2:1-type layer structure, two tetrahedrals sandwiching one octahedral. In recent decades, it is successfully introduced into polymer systems to form clay mineral-based polymer nanocomposites (CPN) in which the silicate layers of the Mt are randomly and homogeneously dispersed at a molecular level in the polymer matrix. Due to the addition of Mt, some properties of CPN, such as the mechanical, thermal, gas barrier properties, were superior to those of pristine polymers.

    XRD results indicated an intercalated structure of organo-Mts in the bituminous matrix. The interaction between the Mts layers and bitumen changed its viscosity and dynamic response as characterized by means of the DSR. Reinforced shear thinning was observed on the modified bitumens at a liquid state, which meant a better drainage resistance during transportation. Results indicated a certain improvement in short term ageing behaviour, but a less effective improvement in long ageing behaviour. The reason for the latter should be due to the tough testing conditions during the long term aging procedure and consequently automatic accumulation of Mt layers under these conditions. The addition of organo-Mts can change the fatigue properties of bitumen and even mortar. This change was influenced by the type of the surfactant on the Mt which determined the interfacial interaction between the bitumen and the Mt. Based on the analyses above, the organo-Mt would be an alternative to modifiers used in the bitumen to sustain the durability of asphalt pavements.

     

     

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