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Understanding of moisture transport due to wetting and drying in concrete and application to design method

Research Project

Project/Area Number 18K13809
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 22010:Civil engineering material, execution and construction management-related
Research InstitutionThe University of Tokyo

Principal Investigator

Sakai Yuya  東京大学, 生産技術研究所, 講師 (40624531)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsコンクリート / 気泡 / 水 / 乾燥 / MRI / セメントペースト / モルタル / 耐久設計 / 浸潤 / 水分浸透
Outline of Final Research Achievements

The objectives of this research was to confirm the existence of the remaining air bubble during water penetration into concrete and to understand the process of the evaporation of the penetrated water.
Firstly, to understand the factors that affect the remaining air bubble during the water penetration, specimens were prepared using various cementitious materials. The amount of the remaining air bubble varied depending on the amount of the AE agent and the admixture materials and the amount corresponds to 12% of the absorbed water at the largest. Next, moisture loss from cementitious materials was observed using MRI with 3T. MRI observation revealed that the drying process in concrete does not occur uniformly from the surface; the inner part dried even though the surface part was still wet.

Academic Significance and Societal Importance of the Research Achievements

コンクリートに浸入する水分は、鉄筋腐食や様々なコンクリート劣化の原因となり、その絶対量や分布に関する情報は、化学反応の予測のみでなくイオンの移動経路とし得tも重要な情報となる。
今回存在が確認された残存気泡は、無視できない量が存在する可能性があり、コンクリート構造物の劣化メカニズムの理解や、高い精度劣化を予測するには考慮することが重要になると考えられる。またコンクリートの乾燥が表面から順に生じないことが示唆されたが、これはコンクリート中の水分状態の正確な把握や劣化振興の高精度な予測に寄与する情報である。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (3 results)

All 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Effect of mix design and curing condition on trapped air bubbles during water permeation2019

    • Author(s)
      Hanjing LIN, Yuya SAKAI
    • Journal Title

      コンクリート工学年次論文集

      Volume: 41 Pages: 701-706

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] EFFECT OF MIX DESIGN AND CURING CONDITION ON TRAPPED AIR BUBBLES DURING LIQUID WATER PERMEATION2019

    • Author(s)
      Lin Hanjing, Yuya Sakai
    • Journal Title

      コンクリート工学年次論文集

      Volume: 41

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Observation of moisture transport in drying cementitious materials using MRI2019

    • Author(s)
      Hanjing Lin, Yuya Sakai
    • Organizer
      The 12th International Symposium of SSMS (Society for Social Management Systems)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

URL: 

Published: 2018-04-23   Modified: 2021-02-19  

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