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An Empirical Study on the Absorption of Carbon Dioxide in OLED-Mixed Concrete through Carbonation Reaction
摘要： In this study, the ability to absorb CO2 in concrete, in terms of carbonation reaction, was evaluated by utilizing organic light emitting diode (OLED) waste glass as a cementitious binder. The substitution level was set 10%, 20%, and 30% by weight of the binder, and water to binder ratio was kept at 0.4 for all mixes. Prior to estimate the concentration of CO2 uptake, an influence of OLED replacement on pozzolanic reactivity and thus strength development of concrete was investigated. CO2 absorption was calculated by molar concentration of carbonatable phases and carbonation depth derived from quantitative X-ray analysis and accelerating carbonation test, respectively. As a result, the blended concrete exhibits a higher strength with an increase of OLED replacement ratio due to the pozzolanic reaction, compared to the control specimen. Also, the content of CO2 uptake for the mixtures was increased with the substitution level of OLED, of which the OLED-mixed concrete was 1.81- 2.76 times higher than the ordinary Portland cement (OPC) 100% concrete. This behavior may be attributed to an increased rate of carbonation progress. Therefore, it is concluded that the capacity of CO2 absorption is improved by the use of OLED glass powder as a cementitious material in a concrete mixture.
关键词： Carbonation,Display byproduct,Pozzolanic reaction,Organic light emitting diode,CO2 absorption
更新于2025-09-23 15:21:01
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Annealing process for recovery of carbonated (Mg,Ca)O protective layer for plasma discharge device
摘要： The carbonation behavior and decarbonation annealing of a protective (Mg,Ca)O layer for flat panel plasma discharge devices were investigated. Compared with a conventional MgO protective layer, the (Mg,Ca)O protective layer showed both high and low discharge voltages. Quantitative X-ray photoelectron spectroscopy analyses indicated that the high discharge voltages were caused by Ca carbonation. The progression of Ca carbonation was enhanced by exposure to air containing H2O but not by exposure to dry air. In addition, once (Mg,Ca)O is carbonated, it is impossible to decarbonate Ca by annealing in air at the temperature applied during the production process. We propose the use of annealing in vacuum as an effective method to promote the decarbonation of Ca and maintain a low discharge voltage for plasma discharge devices with (Mg,Ca)O protective layers.
关键词： discharge voltage,protective layer,XPS,carbonation,(Mg,decarbonation,Ca)O,annealing,plasma discharge device
更新于2025-09-19 17:15:36
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Resonant semiconductor laser absorption of atomic Rb in a pulsed Nd:YAG laser-induced plasma
摘要： Reactive MgO (rMgO) and supplementary cementitious materials are promising to formulate sustainable construction binders. This study compares the effect of GGBFS and FA on the properties of mortar systems containing both r-MgO and Portland cement (rMgO-PC) as binder. The experimental results reveal that the incorporation of 10% GGBFS or 10% FA increases the carbonation degree of the rMgO-PC system at rMgO replacement levels of 0%, 30%, 50% and 70%. The incorporation of 10% GGBFS or 10% FA reduces the expansion of mortars with the 0% and 30% rMgO replacement levels during the sulfate exposure. Sulfate exposure not only leads to the formation of ettringite and gypsum in the mortars with the 0% and 30% rMgO replacement levels, but also accelerates the formation of protodolomite in the 50% and 70% rMgO replacement levels. However, only the ettringite and gypsum were found to jeopardize the volume stability of carbonated mortars.
关键词： Carbonation,Volume stability,FA,GGBFS,Sulfate exposure,Reactive MgO
更新于2025-09-11 14:15:04