scholarly journals A through-solution mechanism for delayed ettringite formation in pre-existing cracks in Portland cement mortar

1995 ◽  
Vol 14 (3) ◽  
pp. 217-219 ◽  
Author(s):  
Y. Fu ◽  
J. J. Beaudoin
Keyword(s):  
Portland Cement ◽  
Cement Mortar ◽  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
Solution Mechanism

Reply to the discussion by P.E. Grattan-Bellew of the paper “Delayed ettringite formation in heat-cured Portland cement mortars”

2000 ◽  
Vol 30 (4) ◽  
pp. 667-668
Author(s):  
Renhe Yang ◽  
Christopher D Lawrence ◽  
Cyril J Lynsdale ◽  
John H Sharp
Keyword(s):  
Portland Cement ◽  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
Cement Mortars

scholarly journals Carbon Storage in Portland Cement Mortar: Influences of Hydration Stage, Carbonation Time and Aggregate Characteristics

2021 ◽  
Vol 3 (3) ◽  
pp. 563-580
Author(s):  
Luqman Kolawole Abidoye ◽  
Diganta B. Das
Keyword(s):  
Particle Size ◽  
Portland Cement ◽  
Carbon Storage ◽  
Cement Mortar ◽  
Fine Sand ◽  
Coarse Sand ◽  
Curing Time ◽  
Curing Conditions ◽  
Surface Areas ◽  
Ettringite Formation

This study elucidates the effects of the particle size, carbonation time, curing time and pressure on the efficiency of carbon storage in Portland cement mortar. Using pressure chamber experiments, our findings show how carbonation efficiency increases with a decrease in the particle size. Approximately 6.4% and 8.2% (w/w) carbonations were achieved in the coarse-sand and fine-sand based mortar samples, respectively. For the hydration/curing time of 7 h, up to 12% carbonation was achieved. This reduced to 8.2% at 40 h curing period. On the pressure effect, for comparable curing conditions, 2 bar at 7 h carbonation time gives 1.4% yield, and 8.2% at 5 bar. Furthermore, analysing the effect of the carbonation time, under comparable conditions, shows that 4 h of carbonation time gives up to 8.2% yield while 64 h of carbonation gives up to 18.5%. It can be reliably inferred that, under similar conditions, carbonation efficiency increases with lower-sized particles or higher-surface areas, increases with carbonation time and higher pressure but decreases with hydration/curing time. Microstructural analyses with X-ray diffraction (XRD) and scanning electron microscopy (SEM) further show the visual disappearance of calcium-silicate-hydrate (C-S-H) together with the inhibition of ettringite formation by the presence of CO2 and CaCO3 formation during carbonation.

Reply to the discussion by S. Chatterji of the paper “Delayed ettringite formation in heat-cured Portland cement mortars”

2000 ◽  
Vol 30 (8) ◽  
pp. 1321-1322 ◽  
Author(s):  
Renhe Yang ◽  
Christopher D Lawrence ◽  
Cyril J Lynsdale ◽  
John H Sharp
Keyword(s):  
Portland Cement ◽  
Delayed Ettringite Formation ◽  
Ettringite Formation ◽  
Cement Mortars
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