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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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Recycling of light-emitting diode waste quartz sand as a pozzolanic material
摘要： LED waste quartz sand (LEDWS), which is a prominent byproduct of the LED manufacturing process, may contaminate the environment because it comprises numerous nanoparticles of SiO2, Al2O3, and SiC, which are hazardous ingredients that are harmful to the environment and human health when disposed of improperly. Therefore, this study investigated the pozzolanic reaction behavior of these industrial byproducts to obtain a valuable processing method for LEDWS in cement. The results showed that with increased curing time, the strength of the pastes that incorporated 10% LEDWS approached that of ordinary Portland cement. A stretching broad band was centered at 1074e1081 cm-1 from chemically bound H2O in the hydrated calcium silicate (CeSeH). Thus, the correlation between the hydration degree of the paste that incorporated LEDWS and compressive strength evolution is crucial. The results implied that LEDWS can be used as a partial replacement source for cement applications; thus, LEDWS can be used as pozzolanic material.
关键词： Degree of hydration,Calcium silicate,Recycle,Light-emitting diode waste quartz sand,Pozzolanic reaction
更新于2025-09-23 15:19:57