Chemical changes and phase analysis of OPC pastes carbonated at different CO2 concentrations
作者： Marta Castellote , Lorenzo Fernandez , Carmen Andrade , Cruz Alonso
DOI: 10.1617/S11527-008-9399-1
关键词: Nuclear chemistry 、 Silica gel 、 Portlandite 、 Composite material 、 Calcium carbonate 、 Thermogravimetric analysis 、 Magic angle 、 Carbonation 、 Materials science 、 Portland cement 、 Carbonatation
摘要: Chemical changes and phase analysis of OPC pastes exposed to accelerated carbonation using different concentrations CO2 (3%, 10% 100%) have been undertaken compared with those natural (≅0.03%). 29Si Magic Angle Spinning-Nuclear Magnetic Resonance (29Si M.A.S-N.M.R), Thermogravimetric analyses (TG) X-Ray Diffraction (XRD) used for characterisation. The the samples has resulted in a progressive polymerisation CSH that leads formation Ca-modified silica gel calcium carbonate. portlandite occurs simultaneously after increases increase concentration CO2. When ≅0.03% 3% are used, lower Ca/Si than uncarbonated sample, quite similar both remained. carbonating at 100% CO2, completely disappears. For every condition, polymerised is formed, as result decalcification CSH. From these results it can be deduced among tested, up (that say, by factor 100) microstructure much more corresponding concentrations.
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