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2023. An Examination and Investigation Compressive Strength the Use of Waste Paper Sludge Ash and Rice Husk Ash as Cement Substitutes in Concrete . International Journal of Innovative Research in Engineering & Management. 10, 3 (Jun. 2023), 60–66. DOI:https://doi.org/10.55524/ijirem.2023.10.3.11.