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Characteristics of Hydraulic Lime using Low-grade Dolomitic Limestone

Moon, Ki-Yeon;Choi, Moon-Kwan;Cho, Jin-Sang;Cho, Kye-Hong;Ahn, Ji-Whan

  • Received : 2015.12.17
  • Accepted : 2016.02.25
  • Published : 2016.03.31

Abstract

This study aims to produce dolomitic hydraulic lime (D-NHL) using domestic low grade dolomitic limestone and to determine the effect of adding blast furnace slag (BFS) and gypsum as part of an investigation of the hydration properties of D-NHL to increase the mechanical properties. The main mineral phases of D-NHL as a hydraulic lime binder were $Ca(OH)_2$, $Mg(OH)_2$, $C_2S$, $C_3S$, and MgO residues. $Ca(OH)_2$ transformed into $CaCO_3$ in D-NHL paste over the period of 28 days, but the carbonation of $Mg(OH)_2$ and the hydration of $C_2S$ did not occur until hydration, after 28 days. Through an investigation of the hydration properties of D-NHL pastes mixed with BFS and gypsum, Al-based compounds such as calcium aluminate hydrates ($C_4AH_{13}$) and ettringite were observed at early hydration time. The compressive strength was improved due to the increased quantities of these hydration products. These results show that good performance results from the application of dolomitic hydraulic lime and that a high value product can be made from domestic waste materials.

Keywords

Dolomite;Natural hydraulic lime;Low-grade limestone;Hydration;Blast furnace slag

References

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Acknowledgement

Supported by : Korea Ministry of Trade, Industry and Energy