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Olivia, M.; Pratama, R. S.; Giri, F. R.; Sitompul, I. R.; Kamaldi, A.; Wibisono, G.; Saputra, E. The Effect of Portland Cement on Fly Ash Bottom Ash Geopolymer Hybrid Concrete Exposed to Peat Water Environment. J. Appl. Mat. Tech. 2023, 3, 24-33.