Carbonation in concrete is a natural chemical process by which atmospheric CO2 reacts with calciu... more Carbonation in concrete is a natural chemical process by which atmospheric CO2 reacts with calcium
oxide in the Ca(OH)2 and CSH phases in hydrated cement paste to form CaCO3. The carbonation rate
in the atmosphere is too slow for laboratory testing, and therefore, it is usually accelerated by using
relatively higher CO2 concentrations. However, there exists some disagreement as to what CO2
concentration, humidity and temperature should be specified when conducting an accelerated
carbonation test. In this study, samples of hydrated cement paste were carbonated at different CO2
concentrations, and analysed using the x-ray diffraction technique. The results show that the
morphology of CaCO3 formed at higher CO2 concentrations is different from that of CaCO3 formed at
natural concentrations. It should be recognized that the diffusion coefficient measured at higher
concentrations will not be exactly the same as that from naturally carbonating concrete due to the
formation of these morphologically different products.
... vinyl ester or an epoxy matrix is pref-erable over the polyester matrix from a durability poi... more ... vinyl ester or an epoxy matrix is pref-erable over the polyester matrix from a durability point of ... Coarse aggregates 103.30 kg Medium sand 80.00 kg Type 10 cement 30.40 kg Fly ash 5.60 kg ... In retrospect, based on the results of the smaller cylinders, it is entirely possible that two ...
Carbonation in concrete is a natural chemical process by which atmospheric CO2 reacts with calciu... more Carbonation in concrete is a natural chemical process by which atmospheric CO2 reacts with calcium
oxide in the Ca(OH)2 and CSH phases in hydrated cement paste to form CaCO3. The carbonation rate
in the atmosphere is too slow for laboratory testing, and therefore, it is usually accelerated by using
relatively higher CO2 concentrations. However, there exists some disagreement as to what CO2
concentration, humidity and temperature should be specified when conducting an accelerated
carbonation test. In this study, samples of hydrated cement paste were carbonated at different CO2
concentrations, and analysed using the x-ray diffraction technique. The results show that the
morphology of CaCO3 formed at higher CO2 concentrations is different from that of CaCO3 formed at
natural concentrations. It should be recognized that the diffusion coefficient measured at higher
concentrations will not be exactly the same as that from naturally carbonating concrete due to the
formation of these morphologically different products.
... vinyl ester or an epoxy matrix is pref-erable over the polyester matrix from a durability poi... more ... vinyl ester or an epoxy matrix is pref-erable over the polyester matrix from a durability point of ... Coarse aggregates 103.30 kg Medium sand 80.00 kg Type 10 cement 30.40 kg Fly ash 5.60 kg ... In retrospect, based on the results of the smaller cylinders, it is entirely possible that two ...
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Papers by N. Banthia
oxide in the Ca(OH)2 and CSH phases in hydrated cement paste to form CaCO3. The carbonation rate
in the atmosphere is too slow for laboratory testing, and therefore, it is usually accelerated by using
relatively higher CO2 concentrations. However, there exists some disagreement as to what CO2
concentration, humidity and temperature should be specified when conducting an accelerated
carbonation test. In this study, samples of hydrated cement paste were carbonated at different CO2
concentrations, and analysed using the x-ray diffraction technique. The results show that the
morphology of CaCO3 formed at higher CO2 concentrations is different from that of CaCO3 formed at
natural concentrations. It should be recognized that the diffusion coefficient measured at higher
concentrations will not be exactly the same as that from naturally carbonating concrete due to the
formation of these morphologically different products.
oxide in the Ca(OH)2 and CSH phases in hydrated cement paste to form CaCO3. The carbonation rate
in the atmosphere is too slow for laboratory testing, and therefore, it is usually accelerated by using
relatively higher CO2 concentrations. However, there exists some disagreement as to what CO2
concentration, humidity and temperature should be specified when conducting an accelerated
carbonation test. In this study, samples of hydrated cement paste were carbonated at different CO2
concentrations, and analysed using the x-ray diffraction technique. The results show that the
morphology of CaCO3 formed at higher CO2 concentrations is different from that of CaCO3 formed at
natural concentrations. It should be recognized that the diffusion coefficient measured at higher
concentrations will not be exactly the same as that from naturally carbonating concrete due to the
formation of these morphologically different products.