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Showing 3 results for Beheshti
Comparison of Silane/Siloxane Coatings in Aqueous and Organic Solvents for Enhancing Stone Hydrophobicity
Amir Ershad Langroudi, Hamid Fadaei, Kamran Ahmadi, Monir Beheshti Far,
Volume 3, Issue 4 (3-2021)
Abstract
The reinforcement and hydrophobicity enhancement of historical construction materials, particularly the surfaces of historical stones, are among the most sensitive and challenging interventions in cultural heritage conservation. These interventions require precise analysis and comprehensive research to minimize potential side effects. Such actions are especially essential when stone artifacts exposed to open environments suffer from severe degradation and erosion or exhibit significant surface changes, potentially leading to loss of aesthetic and structural integrity. Without timely intervention, erosive factors may penetrate deeper layers of the artifact, posing a risk of complete collapse. In this study, the performance of three industrial silane/siloxane-based coatings Wacker 290, Wacker 3003, and Long Life was evaluated in the coating process of stone materials. The physical, mechanical, and especially hydrophobic properties of these materials on stone surfaces were analyzed and compared. Results indicated that all three materials exhibited moisture-repellent properties. However, Long Life and Wacker 290 demonstrated superior performance due to their better bonding with stone surfaces. These findings provide effective guidance for selecting suitable materials in conservation projects of historical artifacts, preventing the premature deterioration of these invaluable heritages.

Microscopic Structure Analysis of Qoli Darvish Pottery from the Early Bronze Age to Iron Age I
Seyed Iraj Beheshti, Sheyda Ashrafi, Siamak Sarlak,
Volume 5, Issue 3 (12-2022)
Abstract
Petrographic studies play a significant role in understanding the structural characteristics and compositions of ceramic artifacts, contributing to the identification of cultural transformations and exchanges based on technical changes in these objects. As such, it is consistently a central component of studies on analyzable artifacts. The archaeological site of Qoli Darvish, located 3 km south of the city of Qom, spans over an area of approximately 30 hectares and contains valuable archaeological remains, including distinctive types of pottery ranging from the Early Bronze Age to Iron Age I. In this study, aimed at investigating the texture, components, and classification of the pottery, 37 pieces of ceramic artifacts discovered during the 2015 excavations were analyzed. Thin-section petrographic analysis, focusing on identifying microscopic structures and existing minerals, was used for this purpose. The results revealed three distinct textures in the pottery samples: coarse-grained heterogeneous or porphyritic texture, fine-grained or silty texture, and clastic texture. The clay matrix of these ceramics shows minimal sorting of its components and contains grog and coarse fillers. Various igneous rock fragments, grog (remnants of silt, clay, or crushed ceramics), calcite, and quartz are visible in the samples. Based on the findings, it can be concluded that the materials used in the production of these ceramics were generally local and sourced from the surrounding region.

The Study of Semi-Precious Stone Samples from the Ahmad Shahi Pavilion in the Niavaran Cultural-Historical Complex
Seyed Iraj Beheshti, Nahid Vahabi Kashani ,
Volume 5, Issue 4 (Knowledge of Conservation and Restoration 2023)
Abstract
The Niavaran Cultural-Historical Complex is situated within a vast garden of approximately 11 hectares garden in northern Tehran, characterized by its rich natural beauty and historical significance. The buildings in this complex date back to the Qajar and Pahlavi eras, including the Sahebqaranieh Palace, the Ahmad Shahi Pavilion, Niavaran Palace, a private library, and the Jahan Nama Museum. Among these, the Ahmad Shahi Pavilion, one of the Qajar palaces in the complex, lacks any dated inscriptions or historical markers.; however, evidence suggests that this building was constructed during the reign of Ahmad Shah Qajar. This two-story building houses personal belongings of Reza Pahlavi. On the ground floor, in the western section of the building, there are two rooms separated by glass display cases. Four large glass display cases segregate these two rooms, containing 106 pieces of rough and cut precious and semi-precious stones, along with several fossils. The primary objective of this article is to study and identify the stone and fossil specimens present in these display cases. The studied stones are primarily quartz in various colors, alongside mineral specimens such as pyrite, chalcopyrite, stibnite, sulfur, and precious stones like beryl, as well as various types of fish fossils, ammonites, trilobites, and contemporary fossils such as corals and fish. Three notable specimens in these display cases include a natural diamond associated with a kimberlite host rock, likely originating from South African mines; a tektite meteorite sample brought from the moon,  which was gifted by then-President t Nixon; and several beautiful rough turquoise mineral samples with a host rock originating from the Nishapur turquoise mine. A significant drawback of this collection is the lack of historical information regarding how these collectible specimens were gathered, purchased, or gifted, and by whom.

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