DOI QR코드

DOI QR Code

Evaluation of Thermal Characteristics in Association with Cement Types in Massive Concrete Structure

매스콘크리트 구조물에서의 시멘트 종류별 수화발열 특성 평가

  • 김상철 (한서대학교 토목공학과) ;
  • 강석화 (동양중앙연구소 건설재료연구팀장) ;
  • 김진근 (한국과학기술원 토목공학과)
  • Published : 1999.12.01

Abstract

The larger, loftier and more highly strengthened the recent structures become, the greater attention is paid to the problem of thermal crack occurrence associate with hydration heat. As one of methods to solve the problem, a care has been taken to the improvement of construction such as the application of pre-cooling or pipe-cooling, adjustment of concrete block size, concrete placement timing, joint arrangement and so on. But it is expected that a proper selection of cement shall additionally contribute to the control of thermal cracks. In this study, thus, we selected 4 types of cements such as Type V for anti-sulphate, blast furnace cements (slag content of 45% and 65% respectively)and ternary blended low heat cement, and carried out mock-up tests. In every assigned time, temperatures and thermal stresses were measured and calculated from raw data. As a result of measurement, it was found that the magnitude of hydration heat is in order of blast furnace slag cement. Type V and ternary blended low heat cement. Results of thermal stresses were same as the order of temperature. In addition, thermal stresses calculated from the data of strain gauges showed almost similar to those measured from effective stress gauges only when strain values were adjusted properly in accordance with initial time of stress appearance. Theoretical results agreed well with the measured values comparatively, but showed slight differences. It is inferred that these differences shall be reduced if more tests capable of evaluating thermal characteristics of concrete are carried out.

References

  1. コンクリ-ト工學年次論文報告集 v.13 no.1 コンクリ-トの現場斷熱溫度上昇試驗方法に關する提案 山川秀次;野池悅雄;東側豊二;川原場博美
  2. 콘크리트학회논문집 v.7 no.2 매스콘크리트구조물의 온도응력평가에 관한 연구 강석화;정철헌;정한중;이용호;박칠림
  3. マスコンクリ-トの溫度應力硏究委員會報告書 日本コンクリ-ト工學協會
  4. Properties of Concrete A. M. Neville
  5. セメント.コンクリ-ト論文集 no.50 各種セメントの耐黃酸性に關する硏究
  6. '96 연구개발사업 최종보고서 매스콘크리트 구조물에서의 수화열저감기법에 관한 연구 김재권;김진근;김상철;강석화
  7. 콘크리트학회논문집 v.7 no.3 시멘트 및 콘크리트의 수화발열 특성에 관한 연구 김진근;노재호;박연동;한정호;김훈
  8. ACI Manual of Concrete Practice v.1 Mass Concrete ACI Committee 207
  9. コンクリ-ト技術シリ-ズ 最新のマスコンクリ-ト技術 日本土木學會
  10. 土木學會論文集 v.18 no.460 マスコンクリ-トの外部拘束に關する檢討 石川雅美;令技靑典