研究目的
To evaluate the ability to absorb CO2 in concrete through carbonation reaction by utilizing organic light emitting diode (OLED) waste glass as a cementitious binder and to investigate the influence of OLED replacement on pozzolanic reactivity and strength development of concrete.
研究成果
The concrete incorporating OLED at substitution levels of 10% ? 30% showed a higher value in the strength after 7 days of curing. The pozzolanic activity of OLED-mixed paste was verified by the quantification of CH content in the sample using the TGA method. OLED replacement exhibited a higher capacity of CO2 uptake due to an increased depth of concrete carbonation.
研究不足
The calculation process did not take into account a variety of hydration degree during carbonation duration by using only the molar concentration of carbonatable phases at 28 days of curing. Besides, the carbonation depth predicted may be somewhat different from the depth derived from the on-site environment.
1：Experimental Design and Method Selection:
The study utilized OLED waste glass as a cementitious binder in concrete mixes with substitution levels of 10%, 20%, and 30% by weight of the binder. The water to binder ratio was kept at 0.4 for all mixes. The influence of OLED replacement on pozzolanic reactivity and strength development 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.
2：4 for all mixes. The influence of OLED replacement on pozzolanic reactivity and strength development 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.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The cement used was OPC that accords with KS L 5201 (2006). Fine glass powder from OLED panel manufacturing waste was used as a reactive additive. The oxide composition of the binders was determined by X-ray fluorescence (XRF).
3：6). Fine glass powder from OLED panel manufacturing waste was used as a reactive additive. The oxide composition of the binders was determined by X-ray fluorescence (XRF).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a universal testing machine with 2,000 kN of capacity for compressive strength tests, Auto TGA Q500 for thermogravimetry analysis, and SEM and PSA for examining the microscopic image and particle size distribution of OLED waste glass.
4：Experimental Procedures and Operational Workflow:
Concrete specimens for measuring compressive strength and rapid carbonation test were fabricated with cylindrical and prism molds, respectively. Cement paste was manufactured for XRD and TGA. After casting, specimens were demolded and immersed in a water bath for specified ages.
5：Data Analysis Methods:
The molar concentration of carbonatable phases was determined by Q-XRD with Rietveld refinement. Carbonation depth was measured by image analysis using Image J software.
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