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

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