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Concrete cores from a building constructed in 1967 on the campus of Nagoya University, Japan, were collected in 2008, and were investigated for ^\u003c14\u003eC, \u03b4^\u003c13\u003eC, and carbon content. The amount of carbon dioxide was 8 % at the concrete surface where the concrete is highly carbonated, decreasing with depth, and was 1 % at the depth where carbonation is hardly observed. The measured ^\u003c14\u003eC values were 144 to 148 pMC at the carbonated surface and 71 to 82 pMC at the depth of less carbonation, decreasing from the surface down to the depth. These profiles can be interpreted as the following: (1) The age of carbonation in the concrete can be estimated by the variation of ^\u003c14\u003eC and carbon concentrations, coupled with atmospheric ^\u003c14\u003eC value at 1967 (-170 pMC: Hua and Barbetti 2004) and the present one (-100 pMC). Most part of CO2 in the surface concrete is estimated to be absorbed and fixed in ten years after construction. 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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学加速器質量分析計業績報告書
  4. 21

放射性炭素を用いたコンクリートの中性化時期の推定

https://doi.org/10.18999/sumrua.21.53
81b2ebeb-30cb-4e6a-b6af-dae02604ad47
名前 / ファイル ライセンス アクション
21-8.pdf 21-8.pdf (6.5 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2011-05-09
タイトル
タイトル 放射性炭素を用いたコンクリートの中性化時期の推定
その他のタイトル
その他のタイトル Age determination of carbonation of concrete using radiocarbon
著者 浅原, 良浩

× 浅原, 良浩

WEKO 83010

浅原, 良浩
Search repository
南, 雅代

× 南, 雅代

WEKO 83011

南, 雅代
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丸山, 一平

× 丸山, 一平

WEKO 83012

丸山, 一平
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吉田, 英一

× 吉田, 英一

WEKO 83013

吉田, 英一
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田中, 剛

× 田中, 剛

WEKO 83014

田中, 剛
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Asahara, Yoshihiro

× Asahara, Yoshihiro

WEKO 83015

Asahara, Yoshihiro
Search repository
Minami, Masayo

× Minami, Masayo

WEKO 83016

Minami, Masayo
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Maruyama, Ippei

× Maruyama, Ippei

WEKO 83017

Maruyama, Ippei
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Yoshida, Hidekazu

× Yoshida, Hidekazu

WEKO 83018

Yoshida, Hidekazu
Search repository
Tanaka, Tsuyoshi

× Tanaka, Tsuyoshi

WEKO 83019

Tanaka, Tsuyoshi
Search repository
キーワード
主題Scheme Other
主題 radiocarbon
キーワード
主題Scheme Other
主題 ^<13>C
キーワード
主題Scheme Other
主題 concrete
キーワード
主題Scheme Other
主題 carbonation
キーワード
主題Scheme Other
主題 age
抄録
内容記述 Radiocarbon method has been applied to concrete in order to estimate progression and age of carbonation in concrete. Concrete cores from a building constructed in 1967 on the campus of Nagoya University, Japan, were collected in 2008, and were investigated for ^<14>C, δ^<13>C, and carbon content. The amount of carbon dioxide was 8 % at the concrete surface where the concrete is highly carbonated, decreasing with depth, and was 1 % at the depth where carbonation is hardly observed. The measured ^<14>C values were 144 to 148 pMC at the carbonated surface and 71 to 82 pMC at the depth of less carbonation, decreasing from the surface down to the depth. These profiles can be interpreted as the following: (1) The age of carbonation in the concrete can be estimated by the variation of ^<14>C and carbon concentrations, coupled with atmospheric ^<14>C value at 1967 (-170 pMC: Hua and Barbetti 2004) and the present one (-100 pMC). Most part of CO2 in the surface concrete is estimated to be absorbed and fixed in ten years after construction. (2) The deeper part of the concrete also contains small amount of atmospheric CO2, which is 43 to 78 % of CO2 in the deeper part. However, δ^<13>CPDB value in the deeper part is-25 to-21‰, and is significantly lower than those of atmospheric CO2 (δ^<13>CPDB=-8‰) and marine sedimentary limestones with geological ages (δ^<13>CPDB=0‰). Carbon isotope compositions, ^<14>C and δ^<13>C, in the deeper part of concrete cannot be explained by a simple mixing of the two components. There are two possible causes of the lowest δ^<13>C value: material originating from cements and/or concrete, and direct absorption of atmospheric CO2 by high-pH cement solutions with kinetic effects in the high-pH zone.コンクリート中性化の進行速度･時期の推定を行うため,コンクリートの^<14>C法の適用を試みた。名古屋 大学内の昭和42年建築のコンクリート構造物について,平成20年に採取したコンクリートコア試料の^<14>C 濃度, δ^<13>CPDB値, CO2濃度の深度変化を求めた。CO2含有量は,コンクリート最表層部で8%と最も高く, 深部こ向かって減少し,中性化がほとんど見られない深部では1%であった。最表層部の^<14>C濃度は144 -148pMCであり,深部に向かって減少し,深都では71～82pMCであった。これらの深度プロファイルか ら以下の結輪が得られた。(1)大気CO2の^<14>C濃度の経年変化のデータ(-170pMC(1967年), -100 pMC(2008年現在): Hua and Barbetti, 2004)と対比することにより,中性化の時期を推定した。その結果, コンクリート最表層部のC02の大部分は建築後10年以内に大気から吸収され，固定されたことが明らかに なった。(2)コンクリート深部のCO2の43-78%は大気起源である。しかしながら，深部のδ^<13>CPDB値(-25 --21‰)は大気CO2の値(δ^<13>CPDB=-8‰)や石灰岩の値(δ^<13>CPDB=0‰)と全く異なることから,深部のCO2 はコンクリ-ト表面から吸収された大気C02と石灰岩起源のC02の単純な2成分混合ではない。この深部 のCO2の低いδ^<13>C値の原因としては,新鮮なコンクリートやセメントに由来するもの, 高アルカリ性の環境下 で大気CO2から炭酸カルシウムが形成される時の同位体分別, が考えられる
内容記述タイプ Abstract
内容記述
内容記述 第22回名古屋大学年代測定総合研究センターシンポジウム平成21(2009)年度報告
内容記述タイプ Other
出版者
出版者 名古屋大学年代測定資料研究センター
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
ID登録
ID登録 10.18999/sumrua.21.53
ID登録タイプ JaLC
書誌情報 名古屋大学加速器質量分析計業績報告書

巻 21, p. 53-60, 発行日 2010-03
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