Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 324, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.126589
Keywords
Eggshell; Waste recycling; Synthesis; Cement clinker; Hydration
Categories
Funding
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20204030200100]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2020R1A4A1019074]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20204030200100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study demonstrates the feasibility of recycling eggshell waste as a raw material for cement clinker production. The comprehensive characterization results show that eggshell cement exhibits similar properties to commercial ordinary Portland cement.
In the Portland cement industry, the reuse of industrial by-products as raw materials for cement clinker production has been increasing. Eggshell waste, which is discharged in large volumes by households and the food industry, consists of a trigonal-calcite (CaCO3) structure, and it possesses characteristics analogous to limestone. In this study, eggshell cement (ESC) was synthesized at 1470 degrees C using pulverized eggshell waste as a raw material for cement clinker production, as an alternative to limestone. Limestone cement (LPC) clinker was also produced under identical conditions to ESC. The anhydrous phases in the synthesized cements and hydrated cement pastes were characterized using X-ray diffraction with Rietveld refinement, field emission scanning electron microscopy, isothermal calorimetry, compressive strength tests, and thermogravimetry analysis. The results indicated that ESC exhibited four main cement clinker phases, namely C3S, C2S, C(3)A, and C(4)AF, identical to commercial ordinary Portland cement (OPC). Moreover, the strength development and hydration characteristics of ESCs are similar to those of LPC. As a consequence, this study illustrated that recycling eggshell waste to partially substitute limestone in raw materials for OPC production is feasible.
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