TITLE:
Fully Recycled Syntheses Using Recycled Concrete Powder, Oyster Shell and Wood Powder: Effect of Combined Ground Treatment on Mechanical Strength and FTIR, XRD, and SEM Characterization
AUTHORS:
Ejazulhaq Rahimi, Yuma Kawasaki, Ayane Yui, Yuta Yamachi
KEYWORDS:
Oyster Shells, Grinding, Recycled Concrete Powder, Waste Wood, Composite
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.15 No.1,
January
7,
2025
ABSTRACT: The use of recycled concrete and oyster shells as partial cement and aggregate replacements is ongoing research to solve this multifaceted problem of concrete waste in the construction industry as well as waste from oyster shell farming. However, there is a lack of evidence on the possibility of producing a fully recycled composite consisting of recycled concrete and oyster shell without the need for new cement and natural aggregates. In this study, recycled concrete powder (RCP) and oyster shell were used to produce a green composite. Separate ground and combined ground (separate ground and co-ground) RCP and oyster shells are used to determine the effects of grinding approaches on the mechanical and chemical properties of the composite. The composite samples were molded via press molding by applying 30 MPa of pressure for 10 minutes. The results revealed that the composite prepared via the combined ground approach presented the highest flexural strength compared to the separate ground and unground samples. The FTIR and XRD characterization results revealed no chemical or phase alterations in the raw materials or the resulting composites before and after grinding. SEM analysis revealed that combined grinding reduced the particles’ size and improved the dispersion of the mixture, thereby increasing the strength.