2023 Fiscal Year Final Research Report
Development of effective salt weathering control methods for archaeological site components undergoing salt weathering
| Project/Area Number |
19K01135
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 03060:Cultural assets study-related
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| Research Institution | Nara National Research Institute for Cultural Properties |
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Principal Investigator |
Wakiya Soichiro 独立行政法人国立文化財機構奈良文化財研究所, 埋蔵文化財センター, 室長 (80416411)
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| Project Period (FY) |
2019-04-01 – 2024-03-31
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| Keywords | 塩類風化 / 脱塩 / 遺跡の現地保存 / 環境調整 / 電気伝導率 / 埋め戻し / 透水性 / 塩析出の抑制 |
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| Outline of Final Research Achievements |
This study examines methods to control salt weathering, which is a problem in many parts of the world, for the on-site preservation of archaeological sites located outdoors. For this purpose, we conducted basic experiments on the following themes: 1) development of on-site salt concentration measurement techniques using electrical conductivity sensors to predict the risk of salt weathering, 2) basic investigation of electrical desalination methods from bricks, mainly for brick masonry structures, and 3) development of appropriate backfilling methods to control salt deposition where desalination is not possible. (3) Development of an appropriate backfilling method to control salt precipitation on the surface of archaeological sites where desalinization is not possible. Practical studies on (1) and (3) were conducted at sites where archaeological sites are being preserved on-site, and (3) was confirmed to be very effective in inhibiting salt weathering.
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| Free Research Field |
保存科学
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| Academic Significance and Societal Importance of the Research Achievements |
ヴェニス憲章によって遺跡は現地保存されることが世界標準となっている。そのため遺跡には周辺地盤から水、塩が供給され続けており、遺跡保存における塩類風化対策は地域を問わない普遍的な課題と言える。塩類風化対策として、過去には合成高分子材料による遺跡の強化処置や、遺跡保存施設を設置し、内部で空調設備を運用する事例が散見されるが、これらは環境への負荷、持続可能性という点において課題が多い。本研究はエネルギー消費を伴う塩害対策を最小限とする塩害リスクを予測する技術の確立、化学薬品に拠らない土の物性による塩析出の抑制方法を目指すもので、今日世界が抱える諸課題と遺跡保存の両立を可能とする基礎研究と言える。
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