Journal of the Korean Recycled Construction Resources Institute (한국건설순환자원학회논문집)

Korean Recycled Construction Resources Institute (한국건설순환자원학회)
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Effect of Cement Contents and Combinations of Accelerators on Strength Development of Concrete Cured at 10℃

10℃ 양생조건에서 단위 시멘트량 변화 및 경화촉진제의 복합사용에 따른 강도발현 성능에 관한 연구

  • Song, Young-Chan (Architectural Engineering & Research Team, DAELIM Industrial Co., Ltd) ;
  • Lee, Tea-Gyu (Architectural Engineering & Research Team, DAELIM Industrial Co., Ltd) ;
  • Kim, Yong-Ro (Architectural Engineering & Research Team, DAELIM Industrial Co., Ltd) ;
  • Seo, Chi-Ho (Department of Architectural Engineering, Konkuk University)
  • 송영찬 (대림산업 건축연구지원팀) ;
  • 이태규 (대림산업 건축연구지원팀) ;
  • 김용로 (대림산업 건축연구지원팀) ;
  • 서치호 (건국대학교 건축공학과)
  • Received : 2018.04.06
  • Accepted : 2018.04.20
  • Published : 2018.06.30
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Abstract

The purpose of this study is to investigate the effect of combinations of different accelerators mixed on the early age strength development of concrete of 21 to 27MPa in the curing temperature of $10^{\circ}C$ compared with existing early strength agent. The present study was assessed the early strength development of combinations of three different accelerating admixtures with early strength type agent comparing to single accelerating admixture with early strength type agent. As a result of this study, the effect of $CaBr_2+NaSCN+DEA$ combination on strength development showed better than $CaBr_2$ or NaSCN alone with early strength type agent. Therefore, we observed that concrete using $CaBr_2+NaSCN+DEA$ combination with early strength agent was achieved 5MPa 12hours earlier than use of $CaBr_2$ or NaSCN alone.

본 연구에서는 현장의 골조공사에 주로 활용되고 있는 설계기준강도 21~27MPa 범위의 콘크리트를 대상으로 $10^{\circ}C$ 온도조건의 범위에서 기존 조강형 혼화제를 사용한 것 대비 경화촉진제를 복합사용하여 추가 첨가할 경우 1종 보통포틀랜드를 사용한 콘크리트의 초기 강도발현에 미치는 영향을 검토하고자 하였으며, 조강형 혼화제에 경화촉진제를 단일 첨가한 기존 자료와 촉진 효과가 우수한 3가지의 경화촉진제를 선정하여 이에 대한 복합사용에 대한 검토를 수행하였다. 본 연구의 실험결과 $CaBr_2+NaSCN+DEA$를 복합사용한 경우 $CaBr_2$, NaSCN의 단일사용에 비하여 시멘트량 및 혼화제의 사용에 따라 강도발현율이 증가되는 경향이 나타났으며, 단위 시멘트량 $330kg/m^3$ 이상의 조건에서 복합형태의 경화촉진제를 첨가하게 되면 기존 조강형 혼화제 또는 경화촉진제를 단일 사용한 것에 비하여 5MPa 발현시점이 12시간 정도 단축할 수 있는 것으로 확인되었다.

Keywords

References

  1. Aggoun, S., Cheikh-Zouaoui, M., Chikh, N., Duval, R. (2008). Effect of some admixtures on the setting time and strength evolution of cement pastes at early ages, Construction and Building Materials, 22(2), 106-110. https://doi.org/10.1016/j.conbuildmat.2006.05.043
  2. Han, C.G., Hwang, I.S., Lee, S.H., Kim, G.D. (2004). Engineering properties of concrete using AE water reducing agent of early-strength type, Journal of the Architectural Institute of Korea, 20(6), 99-106 [in Korean].
  3. Jun, M.H., Bang, J.D., Lee, B.S., Park, S.S., Park, J.Y., Cho, G.H. (2013). Analysis on stripping time of form of high-early-strength concrete incorporating binder and admixture, LHI Journal, 4(2), 193-200 [in Korean].
  4. Kim, G.Y., Kim, Y.R., Park, J.H. (2016). Investigation of early-age concrete strength development using hardening accelerator, Journal of the Korea Concrete Institute, 28(3), 309-316 [in Korean]. https://doi.org/10.4334/JKCI.2016.28.3.309
  5. Min, T.B., Cho, I.S., Lee, H.S. (2013). Fundamental study on the strength development of cement paste using hardening accelerator and high-early-strength cement, Journal of the Korea Institute of Building Construction, 13(4), 407-415 [in Korean]. https://doi.org/10.5345/JKIBC.2013.13.4.407
  6. Park, G.Y., Kim, Y.R., Kim, G.Y. (2013). Early strength development properties of concrete using early strength improvement type cement, Journal of the Korea Institute of Building Construction, 13(3), 227-334 [in Korean]. https://doi.org/10.5345/JKIBC.2013.13.3.227
  7. Park, S.J., Yoo, J.K. (2008). A study on the evaluation of concrete strength at early age for field application using ultrasonic velocity and rebound test method, Journal of the Architectural Institute of Korea, 24(11), 101-108 [in Korean]