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SUMMARY:Optimising the carbonation of reactive-magnesia cement based porou
 s blocks - Cise Unluer\, CUED
DTSTART:20120518T150000Z
DTEND:20120518T163000Z
UID:TALK36581@talks.cam.ac.uk
CONTACT:Jen Fusiello
DESCRIPTION:As the production of Portland cement (PC) is energy intensive 
 and responsible for 5-8% of global anthropogenic CO2 emissions\, many glob
 al initiatives are looking into the development of cements with lower carb
 on footprints. Reactive magnesia (MgO) cements\, which are blends of PC an
 d MgO in different proportions depending on the application\, were develop
 ed with this objective in mind. Reactive MgO is manufactured at much lower
  temperatures than PC and has the ability to sequester substantial quantit
 ies of CO2\, leading to significant increases in strength. In this study\,
  the use of MgO alone as the binder in porous blocks is investigated for t
 he optimisation of the carbonation process. For an optimised carbonation\,
  certain variables including the cement component (e.g. water/cement ratio
  and MgO content)\, curing conditions (RH\, CO2 concentration\, wet/dry cy
 cling\, curing duration under ambient and accelerated CO2 curing)\, aggreg
 ates component (aggregate type and particle size distribution)\, and the i
 nclusion of certain additives were investigated. Cylindrical samples were 
 tested for unconfined compressive strength (UCS)\, porosity\, and permeabi
 lity in addition to microstructure by SEM after being subjected to two dif
 ferent curing environments: accelerated carbonation (20˚C\, 70-90% RH\, 2
 0% CO2) and natural curing (20˚C\, 60-70% RH\, ambient CO2). Thermogravim
 etry/differential thermal analysis (TG/DTA)\, X-ray diffraction (XRD)\, de
 nsity measurements and acid digestion were used to quantify carbonation\, 
 providing guidance towards determining the optimal design parameters of Mg
 O-cement blocks.\n
LOCATION:Engineering Department - Lecture Room 6
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