Search published articles


Showing 2 results for Abbasi
Conservation and Restoration of Fossils from the Maragheh Paleoecological Site
Fereshteh Abbasi, Mehdi Razani,
Volume 2, Issue 2 (Special Issue 1.1 2019)
Abstract
This study examines fossils as part of the country’s natural heritage. These unique and irreplaceable artifacts hold historical, aesthetic, and scientific value. The objective of this research was to investigate the structure and composition of fossils, assess their existing damages, and propose appropriate methods for their conservation and maintenance. The studied samples were obtained from the Maragheh Fossil Research Center, specifically from the 13 Aban site of the Maragheh Formation. The initial phase involved extracting the samples from their encasing blocks and identifying the resulting traces. Following sampling, chemical tests were conducted to identify soluble salts, physical tests including densitometry, moisture content determination, and porosity measurement, as well as structural analyses such as XRF were performed. The soluble salt analysis examined chloride, phosphate, sulfate, and nitrate ions, with results indicating the presence of only phosphate ions in the samples. A precise understanding of the structure, characteristics, and origin of salts is highly beneficial in selecting appropriate conservation and treatment methods. Additionally, the results of physical tests can guide the selection of the type and concentration of consolidate. The XRF analysis was conducted to determine the elemental composition of the samples and their interaction with the surrounding soil. The damages observed in the fossils are primarily physical and mechanical, resulting from environmental conditions, improper transportation, and incorrect restoration practices. Damages such as cracks, microcracks, fractures, cavities, and loss of matrix material may occur before or after excavation. Furthermore, pyrite decay, efflorescence, delamination, light-induced damage, and biological degradation are additional factors affecting fossils and minerals.

Desalination of Historical Porous Materials Using Electro Kinetic Method: A Review to last Researches
Naser Eslami , Hamid Fadaei, Javad Abbasi ,
Volume 4, Issue 1 (10-2021)
Abstract
Soluble salts are known as serious threat for monuments and historical porous materials. The alteration mechanism related by soluble salts such as rocks is essentially a physical process based on the stress level generated by the crystallization of the salts in the pores. In recent years many ways have been developed to extract or deactivate these salts. The efficiency of every desalination system is being evaluated by the amount of extracted soluble salts and the depth of treatment in material. In fact, ionic transport is result of a consortium of energies: kinetic energy, electric energy and chemical energy. These three energies are united together to move and extraction of soluble salts in an optimum  desalination system. The electro kinetic technique is a non-destructive method to extract soluble salts based on electric migration of ions inside the material. This method is even applicable for matrixes with very fine porosity and very low hydraulic permeability. In recent years this method
has been specially considered in European countries. High amount of extracted salts and deep effect on materials have been caused to happen many researches on this topic on historical heritage and considerable results have been gained. This article is a review of background, principles and generals of this method in conservation and desalination of historical porous materials which are threatened by soluble salts alteration. Results from traditional desalination ways are compared with this method as a pioneer technique show an improvement of the quality of desalination, saving time and high efficiency of this method.

Page 1 from 1