EFFECTS OF VARIOUS FACTORS ON EVALUATION OF CARBONATION ENVIRONMENTAL CONDITION USING THIN PLATE MORTAR SPECIMEN

薄板モルタル供試体を用いた中性化環境評価の影響要因に関する基礎的検討

It is known that environmental condition affects carbonation progress of concrete. The effects of environmental condition on carbonation rate are not the same in the same structure. Therefore, the depth of carbonation at various points is not same even in the same structure. It is important to evaluate the effect of environmental condition on the carbonation progress. The purpose of this study is to evaluate the influence of environmental conditions on the carbonation process of concrete structure. Exposure tests of mortar thin plate for 3 months were conducted 4 times a year on various points in two bridges and four structures in water purification plants. The effects of mix proportion and exposure season were studied. After exposure, the amount of CaCO₃ and water content in the plate specimen were measured. The carbonation depth in each part of the structure was closely related with the amount of CaCO₃ in the specimen exposed at the same point. Furthermore, the carbonation depth can be predicted from the amount of CaCO₃ in the mortar thin plate specimen. The conclusions obtained in this study are as follows. （1）The effect of environmental condition on carbonation progress can be evaluated using mortar thin plate specimen is exposed to the part where is not affected by rainfall. （2）Mix proportion that is higher carbonation rate is suitable to evaluate carbonation progress. （3）When mortar thin plate specimens were exposed to actual environment in period with little rainfall, the accuracy of evaluation of carbonation environment is better than exposure test in period with large rainfall.本研究では、環境条件がコンクリート構造物の中性化の進行に及ぼす影響を評価するため、薄板状の小型モルタル供試体を2つの橋梁および浄水場施設の4構造物に貼り付けて暴露し、実構造物の異なる部位における環境条件の影響を評価した。また、モルタルの配合および暴露時期が中性化環境評価に及ぼす影響について検討した。その結果、雨掛かりの無い環境条件下では、薄板供試体によって中性化環境評価が可能であることが確認できた。また、短期間の暴露試験によって長期供用された構造物中性化深さを評価するには、中性化しやすい配合で供試体が乾燥しやすい時期の暴露が適していることが確認できた。

• Record URL:
  https://doi.org/10.14250/cement.67.370
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=EFFECTS+OF+VARIOUS+FACTORS+ON+EVALUATION+OF+CARBONATION+ENVIRONMENTAL+CONDITION+USING+THIN+PLATE+MORTAR+SPECIMEN&author=T.+YAMADA&author=M.+KIKUCHI&author=T.+SAEKI&author=T.+SAITO&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09163182
• Authors:
  • YAMADA, Takeshi
  • KIKUCHI, Michio
  • SAEKI, Tatsuhiko
  • SAITO, Tsuyoshi
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: pp 370-377
• Serial:
  • Cement Science and Concrete Technology
  • Volume: 67
  • Issue Number: 1
  • Publisher: Japan Cement Association
  • ISSN: 0916-3182
  • EISSN: 2187-3313
  • Serial URL: https://www.jstage.jst.go.jp/browse/cement/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Carbonation; Concrete bridges; Concrete structures; Deterioration by environmental action; Mortar; Thin plates; Weathering
• Subject Areas: Bridges and other structures; Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01562553
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Apr 30 2015 9:23AM