Application of ceramic waste aggregates in fly ash, metakaolin, and silica fume based geopolymer concrete
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The study introduces an innovative approach to utilise ceramic waste aggregates (CWA) in the production of environmentallyfriendly geopolymer concrete (GPC), as a substitute for conventional coarse aggregates (CCA). This novel method involvesthe incorporation of class F fly ash (FFA), metakaolin (MK), silica fume (SF) and alkali activators to create the geopolymerconcrete. The main purpose of this study is to investigate the mechanical, mineralogical and microstructural properties ofFFA, MK and SF in GPC. The results of the investigation reveal a positive synergistic effect among FFA, MK, and SF, leadingto enhanced mechanical and microstructural performance of CWA-based GPCs compared to OPC concrete. Among thevarious mix designs, the F30M50S20 combination exhibits the highest compressive strength (48.5 MPa), flexural strength(6.85 MPa), and split tensile strength (4.14 MPa). Microstructural and mineralogical analyses conducted using SEM, XRD,and TGA techniques illustrate the densification of the matrix and the development of C-S-H gel. Moreover, the formation ofmullite mineral is also observed, which could be attributed to the improved performance of GPCs. This study demonstrates thefeasibility and advantages of incorporating ceramic waste aggregates into geopolymer concrete.
Abstract
The study introduces an innovative approach to utilise ceramic waste aggregates (CWA) in the production of environmentallyfriendly geopolymer concrete (GPC), as a substitute for conventional coarse aggregates (CCA). This novel method involvesthe incorporation of class F fly ash (FFA), metakaolin (MK), silica fume (SF) and alkali activators to create the geopolymerconcrete. The main purpose of this study is to investigate the mechanical, mineralogical and microstructural properties ofFFA, MK and SF in GPC. The results of the investigation reveal a positive synergistic effect among FFA, MK, and SF, leadingto enhanced mechanical and microstructural performance of CWA-based GPCs compared to OPC concrete. Among thevarious mix designs, the F30M50S20 combination exhibits the highest compressive strength (48.5 MPa), flexural strength(6.85 MPa), and split tensile strength (4.14 MPa). Microstructural and mineralogical analyses conducted using SEM, XRD,and TGA techniques illustrate the densification of the matrix and the development of C-S-H gel. Moreover, the formation ofmullite mineral is also observed, which could be attributed to the improved performance of GPCs. This study demonstrates thefeasibility and advantages of incorporating ceramic waste aggregates into geopolymer concrete.
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