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Investigation on the relation between shrinkage and microstructure of alkali activated cement



Title: Investigation on the relation between shrinkage and microstructure of alkali activated cement
Author(s): W. Shen, M. Zhou, T. Zhang, J. Hu, Z. Cai, Y. Wang
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 117 - 125
Total Pages: 9
Nb references: 20
Language: English


Abstract: The cement industry is currently responsible for 10% of all anthropogenic CO2 emissions, Alkali Activated Cement (AAC) has very low CO2 emissions and can deplete large mount of solid waste, it may be the cement of the future. Alkali Activated Slag (AAS) is a typical AAC, the high tendency of shrinkage and cracking is the most critical drawbacks for broader application of this promising cement. In this paper, the shrinkage and cracking behavior of AAS and the material structure of AAS paste in multi scale were studied by comparing with the Portland Cement (PC) paste. Results indicated that the crack tendency of the AAS increases with sodium silicate modulus, the AAS paste has soil like fracture texture, it is mainly composed with C-S-H gel but lacks of crystals, AAS paste is much denser and more homogeneous than PC, the C-S-H nano particle in the AAS paste is much smaller than the PC paste, and the nano particle packs much denser than PC, the lack of crystal, smaller particle and smaller size of pore is the main reason for high shrinkage and cracking tendency of AAS.


Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00