Enhancing thermal insulation with phosphate washing sludge waste as an inorganic foaming agent in porous acid-based geopolymers: Formulation and processing optimization von Majdoubi, H., Haddaji, Y., Bourzik, O., Nadi, M., Ziraoui, J., Alomayri, T.S., Oumam, M., Manoun, B., Alami, J., Tamraoui, Y., Hannache, H.

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