Abstract
The cement industry endeavors to reduce CO2 emissions from cement manufacturing by utilizing industrial by-products as alternative fuels and developing secondary concrete products from construction wastes. With these efforts, the cement industry is attempting to become more eco-friendly and reduce environmental load. This study analyzed the possibility of using inorganic construction wastes to produce environmentally friendly recycled cement using the process of proportioning. To this end, the types and production trends of recyclable construction wastes and previous studies on the development of recycled cement using such construction wastes were analyzed. Based on this analysis, recyclable inorganic construction wastes were selected, and real waste was collected. The chemical composition of each inorganic construction waste was analyzed using X-ray fluorescence, and the composition of ordinary commercial cement was used as the baseline. After the collected inorganic construction wastes were mixed, they were fired using the Bogue formula. The mineral components of clinker, which was generated from the firing process, were predicted and analyzed. Waste gypsum board and ceiling materials were shown to contain large amounts of CaO, which could substitute limestone—a key component of cement. These results suggested that if the limestone content was greater than 85 wt %, mixing inorganic construction wastes in appropriate proportions could be used to develop various types of Portland cement.
Highlights
The cement industry continues to have a large impact on industrial and economic development.significant efforts are being made to transform the cement industry into a sustainable industry from an environmental perspective [1,2,3]
We analyzed the chemical compositions of inorganic construction wastes that had been deemed, based on the results of the literature review, as viable substitutes for the raw materials used in cement production
The present study examined the theoretical combinations of various inorganic construction wastes as a means of developing eco-friendly recycled cement
Summary
Significant efforts are being made to transform the cement industry into a sustainable industry from an environmental perspective [1,2,3]. Despite these attempts, the construction industry still faces social problems, which are related to increasing quantities of wastes and treatment issues, and environmental challenges that arise as a result of resource depletion and global pollution caused by the greenhouse gases generated from the production of materials [4,5,6]. It was reported that China, India, the United States, and South Korea produce the largest quantities of cement globally [7,8,9]
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