The study is handling the application of geopolymer , as one of the eco-friendly green binder materials. The experimental study provided composites of geopolymer , as an alternative restoration mortar to traditional mortars and employed them according to the needs of restoration operations (blocks, mortars, adhesives, etc.). The study presents a composite of an inorganic geopolymer. Examinations and tests were also carried out on stone, mortar, the components of the proposed geopolymer mixtures and the prepared samples.

The components of the geopolymer mixtures were selected from two geopolymer sources, metakaolin or kaolin as a natural source, fly ash as a secondary industrial product, limestone powder, natural hydraulic lime (NHL-5), sand, distilled water and sodium hydroxide (NaOH) was used as an activating agent.

Mixtures were prepared in varying proportions with three molarities (6,4,2 mol) and composites were also applied to experimental models of stone samples and clay mortars to choose the best geopolymer composites for their application in the restoration of mural paintings at Saqqara necropolis in Egypt.

The results for the selected geopolymer mixtures showed densities ranging from 2.0 to 2.17 g/cm³, porosity ranging from 6.98% to 18.99%, and compressive strength ranging from 31.91 to 53.81 MPa, which is approximately 2.3 times more than the compressive strength of wall painting support