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지연제를 혼입한 고강도 콘크리트의 매트기초 적용을 위한 최적배합 산정에 관한 실험적 연구

An Experimental Study on the Optimal Mixing Design for Application Mat Foundation of High Strength Concrete adding Retarding Admixture

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한국구조물진단유지관리공학회 (The Korea Institute For Structural Maintenance and Inspection)
초록

This study is to be suggest the optimal mat foundation mixing design of high strength concrete by using fly ash and retarding admixture. This study applied retarding admixture to high strength concrete over 40MPa, and tested the mechanical properties of concrete according to binder content(385∼415kg/㎥), fly ash substitution rate(0~25%), and adding rate of retarding admixture(0~1.2%) As a results, For the concrete to be applied to lower part of mat foundation, it is suitable to substitute FA 25% with binder contents 385kg/㎥ and to apply the mixing with adding retarding admixture 1% in order to repress hydration heat and to cast concrete at once through congelation delay. As a result of experiments of adiabatic temperature rising, coefficients of adiabatic temperature rising K and α were 40.68 and 1.08 for retarding-type concrete and 42.8 and 1.13 for standard concrete, respectively, under the condition of initial concrete temperature about 19℃. In the identical temperature condition, differences of adiabatic temperature rising speed according to use of retarding admixture were not different, and maximum value of adiabatic temperature rising of retarding-type concrete was lower than standard concrete. Keywords: Retarding Admixture, High Strength Concrete, Mat Foundation, Fly Ash, Adiabatic Temperature Rise

저자
  • 이동하(단국대학교 건축공학과, 박사과정) | Lee, Dong Ha
  • 임남기(동명대학교 건축공학과 교수, 공학박사) | Lim, Nam Gi 교신저자