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Durability of Alkali-Activated Blast Furnace Slag Concrete: Chloride Ions Diffusion

알칼리 활성 슬래그 콘크리트의 내구성: 콘크리트의 염소이온 확산

  • Nam, Hong Ki (Department of Civil Engineering, Chungbuk National University) ;
  • Kyu, Park Jae (Department of Civil Engineering, Chungbuk National University) ;
  • San, Jung Kyu (Department of Civil Engineering, Chungbuk National University) ;
  • Hun, Han Sang (Department of Civil Engineering, Chungbuk National University) ;
  • Hyun, Kim Jae (Department of Civil Engineering, Chungbuk National University)
  • Received : 2015.04.22
  • Accepted : 2015.07.06
  • Published : 2015.08.31

Abstract

The aim of the present study is to investigate some characteristics of concrete according to addition of blast furnace slag and alkali-activator dosages. Blast furnace slag was used at 30%, 50% replacement by weight of cement, and liquid sulfur having NaOH additives was chosen as the alkaline activator. In order to evaluate characteristics of blast furnace slag concrete with sulfur alkali activators, compressive strength test, total porosity, chloride ions diffusion coefficient test were performed. The early-compressive strength characteristics of blast furnace slag concrete using a sulufr-alkali activators was compared with those of reference concrete and added 30, 50% blast furnace slag concrete. Also, Blast furnace slag concrete using sulfur-alkali activators enhanced the total porosity, chloride ions diffusion coefficient than two standard concrete. Alkali-activated blast furnace slag concrete was related to total porosity, compressive strength and chloride ions diffusion coefficient each others. As a result, it should be noted that the sulfur-alkali activators can not only solve the demerit of blast furnace slag concrete but also offer the chloride resistance of blast furnace slag concrete using sulfur alkali activators to normal concrete.

Acknowledgement

Supported by : 충북대학교

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