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SUMMARY:Application of two novel magnesia-based binders in Stabilisation/S
 olidification treatment systems. - Srinath Iyengar\, CUED
DTSTART:20080530T153000Z
DTEND:20080530T163000Z
UID:TALK11453@talks.cam.ac.uk
CONTACT:Zelda Stuck
DESCRIPTION:Portland cements (PC) and blended PCs are the most commonly us
 ed binders in Stabilisation/Solidification (S/S) applications. However\, s
 uch systems have found limited suitability with organic contaminants and t
 he high alkalinity associated with PC militates against the soil microbes 
 and hence\, the natural attenuation of the organics. Furthermore\, the pro
 duction of PC is not only an extremely resource and energy intensive proce
 ss but also has significant negative environmental impacts. This research 
 has thus been focused on addressing these issues by the development and ap
 plication of two novel binders\; viz. low pH magnesia phosphate cement and
  reactive magnesia cement respectively. A range of binder formulations bas
 ed on those two cements were investigated in the S/S treatment of model co
 ntaminated soils. \n\nThis study was successful in formulating magnesia ph
 osphate cement mixes which could have the potential to facilitate biodegra
 dation of organic contaminants in parallel to the S/S of heavy metals. Not
  only did those mixes develop low-pH ranges favourable to soil microbes bu
 t also more effectively immobilised heavy metals than PC-based binders. Th
 e reactive magnesia cements also displayed an advantage over PC-based bind
 ers especially in terms heavy metal immobilisation highlighting their pote
 ntial as a sustainable alternative to PC in S/S applications. This present
 ation will mainly focus on the variables involved in magnesia phosphate ce
 ment formulations and heavy metals related S/S performance of the two bind
 er mixes. These aspects will be elucidated through a range of physical\, m
 echanical\, chemical and microstructural properties. \n\n\n
LOCATION:Engineering Department - LR3A
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