The Impact of Oil Shale Ash on the Mechanical Properties of Cement Mortar as a Partial Cement Substitute for Sustainable Buildings. - Edris, Walid Fouad; Mhedat, Heba M.; Al-Tamimi, Mahmoud; Almutairi, Ahmed D.; Al Sayed, Abd Al-Kader A.; Selouma, Tarek Ibrahim (Buildings (2075-5309), 2026)