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, [S. l.], v. 10, n. 3, p. 60–66, 2023. DOI: 10.55524/ijirem.2023.10.3.11. Disponível em: https://acspublisher.com/journals/index.php/ijirem/article/view/10218.. Acesso em: 30 jun. 2024.