• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2011 Fiscal Year Final Research Report

Research on deterioration of concrete caused by delayed ettringite formation

Research Project

  • PDF
Project/Area Number 21560479
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Civil engineering materials/Construction/Construction management
Research InstitutionIwate University

Principal Investigator

HANEHARA Shunsuke  岩手大学, 工学部, 教授 (10400178)

Co-Investigator(Kenkyū-buntansha) OYAMADA Tetsuya  岩手大学, 工学部, 助教 (70361045)
Project Period (FY) 2009 – 2011
Keywordsコンクリート / 耐久性 / 膨張劣化 / コンクリート製品 / エトリンガイト / 膨張
Research Abstract

Delayed ettringite formation (DEF) is a phenomenon in which ettringite is generated and accumulates in the concrete after hardening, eventually leading to expansion and destruction of the concrete. In this study, DEF expansion was reproduced in laboratory using a variety of cements, sulfate additions, steam curing conditions and storing conditions. DEF was found to take place only when the three conditions of excessive sulfate, high-temperature steam curing and ample water supply are met simultaneously. The influence of the kind of calcium sulfate (gypsum, hemihydrate or anhydrite CaSO_4) and the heating rate of steam curing was studied. The cases of expansive deterioration of concrete due to delayed ettringite formation (DEF) and the counter measure of DEF in Japan are described in this paper. The influence of kind of cement, aggregate and sulfate and added amount of sulfate on the expansion of concrete by delayed ettringite formation (DEF). The evaluation method of concrete against DEF is also described. As it is reported that both the alkali silica reaction (ASR) and DEF are sometimes observed in the same deteriorated concrete, the relationship between the alkali silica reaction and DEF is also discussed.

  • Research Products

    (4 results)

All 2012 2011 2010

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results)

  • [Journal Article] DEFおよびアルカリ骨材反応による劣化組織の観察2010

    • Author(s)
      羽原俊祐, 小山田哲也, 福田峻也, 本田葉子
    • Journal Title

      コンクリート工学年次論文集

      Volume: Vol.32, No.1 Pages: 887-892

    • Peer Reviewed
  • [Presentation] THE CASE AND RESEARCH PROGRESS IN JAPAN : rilem Proceeding Pro 852012

    • Author(s)
      Shunsuke. HANEHARA, Tetsuya OYAMADA and Makoto TANIMURA : DELAYED ETTRINGITE FORMATION
    • Organizer
      CONCRACK 3. RILEM-JCI International Workshop on Crack Control of Mass Concrete and Related Issues Concerning Early-Age of Concrete Structures
    • Place of Presentation
      Paris, France
    • Year and Date
      20120315-16
  • [Presentation] 硫酸塩の種類及び蒸気養生温度が蒸気養生前後のエトリンガイトの生成に及ぼす影響無機マテリアル学会2011

    • Author(s)
      本田葉子,羽原俊祐,小山田哲也,加美山雄太,セメント
    • Organizer
      第123回学術講演会
    • Place of Presentation
      佐賀
    • Year and Date
      20111117-18
  • [Presentation] Reproduction of delayed ettringite formation (DEF) in concrete and Relationship between DEF and alkali silica reaction, Fracture Mechanics of Concrete and Concrete Structures (FraMCoS7)2010

    • Author(s)
      S. Hanehara and T. Oyamada
    • Organizer
      Assessment, Durability, Monitoring and Retrofitting of Concrete Structure
    • Place of Presentation
      Jeju, Korea
    • Year and Date
      20100523-29

URL: 

Published: 2013-07-31  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi