Pamukkale University Journal of Engineering Sciences, cilt.12, sa.1, ss.1-22, 2026 (TRDizin)
Haho (Khakhuli) church, built in the 10th century during the Bagrat Kingdom, is located within the borders of Bağbaşı Village, formerly known as Haho, in Erzurum province, Tortum District. The monastery, which was an important educational institution in the Middle Ages, was deteriorated over time due to environmental impactsand repeated natural disasters. Restoration work has become inevitable for the building to survive. The main purpose of this study is to determine the properties of the Haho Church rubble wall filling mortar using analytical methods and to develop a prescription for the filling mortar to be used in the restoration of the building. In this study, employing an experimental methodology, the raw material properties of samples taken from the filling mortar used in the church's masonry were analyzed through physical, chemical, and petrographic analyses. Petrographic analysis revealed the aggregate content and binding characteristics of the mortars. It was found that none of the samples contained cement; instead, lime was used as a binder, all samples included pozzolanic materials, and brick fragments were consistently present. Based on the archaeometric data obtained, a compatible filling mortar formulation was developed for use in the building's restoration. The findings of this study are intended to support the restoration of similar historical structures.