Evaluation of Silica Nanoparticles in Consolidation of Sheikh Haidar Tomb Tower’s Dadui in Meshkinshahr, Iran

This research aims to evaluate consolidation using nanoparticles in historical and cultural stones. This, due to its different intrinsic properties, has become a serious and needed field in most areas. The tested stone samples belong to the dadu of Sheikh Haidar tomb tower in the meshkinshahr-Ardabil province. that is related to the Middle Ages of the Islamic period. During the research, petrography, XRD and XRF were performed to identify the bedrock, and the type of stone was identified in the calcareous carbonate category, and then to identify and evaluate the effectiveness of nanomaterials, physical resistance, aging and durability tests were performed. The final result showed that, contrary to the notion of nanoparticles, it did not enter the depth of the studied samples and only strengthened the surface of the stones, as a result of which, the stone surface was separated as integrated plates and the core was not consolidated. It went through aging cycles. However, in the persistence cycle, the treated sample had more resistance than the untreated one, which indicated an increase in its physical resistance.