Articles
  • Effect of blast furnace slag on the hydration properties in natural hydraulic lime
  • Ki-Yeon Moona,d, Jin-Sang Choa,*, Moon-Kwan Choia, Kye-Hong Choa, Ji-Whan Ahnb, Chang-Woo Hongc and Soon-Chul Urd
  • a Department of Research and Development, Korea Institute of Limestone and Advanced Materials, 18-1 Udeok-gil, Maepo-eup, Danyang, Chungbuk 395-903, Korea b Mineral Resources Research Division, Korea Institute of Gecoscience and Mineral Resources, 124 Gwahak-ro, Yuseong-gu, Daejeon, 305-350, Korea c Department of Civil Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-702, Korea d Department of Materials Science and Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-720, Korea
Abstract
Natural hydraulic lime (NHL) has gained a great deal of attention as an eco-friendly construction material, but its application has remained very limited due to its insufficient mechanical properties. The addition of mineral admixture to NHL has been considered as a means of addressing this drawback and improving the mechanical properties for future commercialization. The effects of adding a mineral admixture such as blast furnace slag (BFS) or anhydrite (AH) to NHL on the hydration properties were systematically investigated in this study. Local Korean NHL (K-NHL) was synthesized using domestic lowgrade limestone. The hydration properties of the NHL products were then investigated as a function of the hydration time and the addition ratio of inorganic additives. Through an investigation of the hydration properties of NHL pastes mixed with BFS and AH, Al-based compounds such as calcium aluminate hydrates (C4AH13) and ettringite (3CaO • Al2O3 • 3CaSO4 • 32H2O) were observed at early hydration time. The formation of calcium silicate hydrates (C-S-H) increased with enlargement of the amount of inorganic additives. The compressive strength and setting time were improved due to increased quantities of these hydration products.

Keywords: Limestone, Natural hydraulic lime, Blast furnace slag, Anhydrite, Hydration.

This Article

  • 2016; 17(2): 122-128

    Published on Feb 29, 2016

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