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From Thixotropy of Self-Consolidating Concrete to SmartCast and 3D Printing

發布時間:2020-07-27    瀏覽次數:107


報告題目:From Thixotropy of Self-Consolidating Concrete to SmartCast and 3D Printing
報 告 人: Dr. Assistant Prof. Ye QIAN
主 請 人: 元強
                 Dr. Qian is currently Assistant Professor at the University of Hong Kong. He worked as Research Fellow at Singapore Centre for 3D Printing. Before that, he also worked as postdoctoral Research Fellow at Ghent University in Belgium. He has obtained his Ph.D. at Columbia University in the City of New York, his M.S. at Hokkaido University in Japan, and his B.S. at Huazhong University of Science and Technology in China. He specializes in cement and concrete rheology, especially developing character
時  間:2020年7月29日(星期三)下午14:00-15:00
地  點:騰訊會議室是:350 830 794

Compared with conventional vibrating concrete, self-consolidating concrete (SCC) is more flowable and can consolidate under its own weight. So it introduces many advantages in construction applications. These include decreasing labor work for casting, better quality control and enhancing hardened properties. However, challenges still remain, such as issues relating to formwork pressure and multi-layer casting. Each of these issues is closely related to the property of thixotropy. For SCC, as well as other concrete systems, it is about balancing sufficient flowability during casting and rate of structural buildup after placement. For instance, relating to the issue of SCC formwork, it is ideal for the material to be highly flowable to achieve rapid casting, but then exhibiting high rate of structural buildup to reduce formwork pressure. This can reduce the cost of formwork and reduce the risk of formwork failure. Likewise, for 3D concrete printing, it is important to be flowable during pumping, and be strong and stiff enough to build up a certain height. It is apparent that accurately quantifying the two aspects of thixotropy, i.e. structuration and destructuration, is key to tackling these challenges in field application.



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