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【硅酸盐建筑材料国家重点实验室】Characterization and Identification of Bitumen with the Modification of Montmorillonite Nanoclay

发布时间:2012-02-17 字体:[增加 减小]
学术报告

 

 

报告主题:Characterization and Identification of Bitumen with the Modification of Montmorillonite Nanoclay

时间:2012年2月10日上午9:30

地点:硅酸盐建筑材料国家重点实验室北楼406室

 

主讲人:刘刚,博士,2007年开始在荷兰代尔夫特理工大学(Delft University of Technology)道路与铁路工程系(Road and Railway Engineering Section)攻读博士学位,于2011年12月获得博士学位,目前在该校从事博士后研究工作。刘刚博士的主要研究领域为纳米改性沥青,该项技术被用来改善沥青路面的耐久性。

 

内容简介: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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