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SUMMARY:Characterisation and Performance of reactive MgO-based cements - F
 ei Jin\, CUED
DTSTART:20140612T150000Z
DTEND:20140612T160000Z
UID:TALK51932@talks.cam.ac.uk
CONTACT:Jen Fusiello
DESCRIPTION:During the last century\, cement has developed into the most i
 mportant building material in the world\, and it is responsible for ~7% of
  all man-made CO2 emissions. Various measures have been proposed or implem
 ented to reduce the carbon footprint of the cement industry such as improv
 ing the energy efficiency\, use of renewable energy\, and carbon capture a
 nd storage technologies. The development of novel cements-also termed as 
 “sustainable” or “green” cements has also been considered. Two pro
 mising sustainable cements are alkali-activated slag cements (AAS) and MgO
 -based cements. However\, AAS suffers from large drying shrinkage and the 
 use the caustic alkalis. In addition\, previous studies demonstrated that 
 the characteristics of MgO have a significant impact on the properties of 
 the MgO-based cements. The current study dedicates to develop novel reacti
 ve MgO-based cements with supplementary cementitious materials and to expl
 ore the role of reactive MgO in AAS cements. In the first section\, a thor
 ough characterisation of 14 commercial reactive MgOs was performed\, based
  on which the MgOs were grouped into 3 categories. Then two novel MgO-base
 d cements\, namely\, reactive MgO-microsilica cement and reactive MgO-slag
  cement were studied in terms of their mechanical and hydration properties
 . The hydration mechanisms between reactive MgO and microsilica/slag were 
 proposed based on various analytical techniques such as XRD\, TGA\, SEM/ED
 S. In addition\, the effect of the characteristics of MgO on the performan
 ce of the cement pastes was discussed. In the last section\, three reactiv
 e MgO-based ternary cement systems\, namely\, reactive MgO-CaO-slag\, reac
 tive MgO-waterglass-slag and reactive MgO-sodium carbonate-slag cement\, w
 ere investigated in terms of their mechanical\, drying shrinkage and hydra
 tion properties. The effect of the reactivity and content of MgO on the pe
 rformance and hydration products of the AAS was discussed.
LOCATION: Cambridge University Engineering Department\, Lecture Room 6
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