Action of Urine on Stone-Built Heritage

IF 0.6 0 ART

International Journal of Conservation Science Pub Date : 2023-06-15 DOI:10.36868/ijcs.2023.02.01

Aranda Calió dos Reys, E. A. Del Lama

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引用次数: 0

Abstract

Due to its resistance and durability, stone is the material most used in construction by humanity. The aim of this study was to investigate the action of urine on granites. Accelerated alteration tests were performed on Grey Itaquera, Pink Itupeva, and Black Piracaia granites – stones from the São Paulo State, Brazil, which were widely used in the historical built heritage of the São Paulo state. The test was performed with 30 cycles of partial immersion of nine samples in artificial urine solution and the sanitising of the specimens, totalling 60 consecutive days of testing. In the first 24 hours, the samples were partially immersed in urine; in the following 24 hours, the samples were sanitised in three different groups: A) without washing; B) washing with natural water; C) washing with a 5:1 solution of natural water with bleach. The alterations induced in the specimens were evaluated by spectrophotometry, P-wave velocity, and scanning electron microscopy. The main results obtained were chromatic alterations and crystallisation of salts on the three types of granite. The study concluded that urine is a substance that can cause moderate alterations in the aesthetics and structure of granitic stones.

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尿液对石质文物的作用

由于其耐腐蚀性和耐久性，石头是人类在建筑中使用最多的材料。本研究的目的是研究尿液对花岗岩的作用。对来自巴西圣保罗州的灰色Itaquera、粉红色Itupeva和黑色Piracaia花岗岩进行了加速蚀变试验，这些花岗岩在圣保罗州的历史建筑遗产中广泛使用。该测试将9个样本部分浸泡在人工尿液溶液中，并对样本进行消毒，共进行了30个周期的连续60天测试。在最初的24小时内，样本部分浸入尿液中；在接下来的24小时内，将样品分为三组进行消毒：A）不洗涤；B）用天然水洗涤；C）用含漂白剂的天然水5:1溶液洗涤。通过分光光度法、P波速度和扫描电子显微镜评估样品中诱导的变化。获得的主要结果是三种类型的花岗岩上的颜色变化和盐的结晶。研究得出的结论是，尿液是一种可以引起花岗岩美学和结构适度改变的物质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Conservation Science ART-

CiteScore

1.70

自引率

37.50%

发文量

审稿时长

10 weeks

期刊介绍： The International Journal of Conservation Science (IJCS) is a high quality peer-reviewed journal devoted to the publication of original research papers in applied conservation science and its broad range of applications. IJCS it is an open access journal. All content is freely available without charge to any user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. The topics cover all disciplines and branches of modern scientific conservation, including different aspects on general conservation theory, scientific investigation of works of art, authentication, determination of conservation state, compatibility studies for preservation and restoration procedures and monitoring of interventions effectiveness, etiopathology of historic and natural monuments, studies on the mechanisms of deterioration and degradation for different materials as structural and ornamental elements, impact of the environmental factors or agents on monuments and ecosystems, obtaining and characterization of new materials and procedures for preservation and restoration, new methodologies for scientific investigation, cross-related problems concerning research applied to conservation science, biodiversity conservation. Review articles in selected areas are published from time to time.