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Sustainable and Science-driven Engineering of Cement-based Materials (SSEC2011)
信息来源:  发布日期:2/14/2011 4:44:36 PM

Date: July 18-19, 2011
Place: Tsinghua University
Organized by: Chinese Ceramic Society, Tsinghua University and Lafarge Research Center
Invited speakers: 23
Attendants: 120
[Workshop Summary]
On fundamental scientific research, the thermodynamics and kinetics of hydration of cements are introduced and used to optimize the formation of cement hydrates and accordingly the microstructure of cement-based materials. The chemistry and crystallography of cement clinkers are presented with special attention given to C3S crystal structure as well as Alite/Blite-sulphoaluminate systems. Principles and application of X-ray transmission microscopy are described as advanced nanoscopic observation. The understanding of fundamental processes related to the durability performance of cement-based materials is given for frost damage, delayed ettringite formation (DEF) and corrosion of rebars. The Poromechanics is applied to the phase change in pores of cement-based materials. The key parameter of cement-based materials is identified as the permeability, and the gas permeation and moisture transport in pores are reported with special emphasis on the related permeation processes in cracks.  
On the new materials and applications, the alternative clinkers and mineral additives are introduced, including alternative binders, alkali-activated cements, high-volume fly ash (FA), steel slag/size distribution, durability of FA cement. Meanwhile, the chemical admixture and its interaction with cement hydration process are presented. Innovative cement-based materials, low thermal conductivity material (Thermedia) and ultra-high performance concrete (UHPC), are presented for the material principles and applications. Concrete recycling technology is described for Hong Kong region. Two large scale infrastructures, Hong Kong-Zhuhai-Macau sea link project and Qinghai-Tibet railway project, are presented for the innovative techniques and technical challenges.
On the frontier research, the Nanocem network is set up to embrace the fundamental research, interdisciplinary collaboration and continuity of research. The observations and research on nanoscale is emphasized. On the nanoscale, the calcium silicate hydration (CSH) hub at MIT is reported, covering molecular simulation to life cycle cost (LCC) analysis.

                                                                   Written by Dr. Kefei LI, Tsinghua University

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