Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Characteristics of Alkali-activated Natural Hwangtoh Paste Utilizing Microwave Heating

  • Kim, Baek-Joong (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Yi, Chong-Ku (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Kang, Kyung-In (School of Civil, Environmental and Architectural Engineering, Korea University)
  • Received : 2012.02.06
  • Accepted : 2012.07.23
  • Published : 2012.10.20
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Abstract

In this study, the potential use of indigenous natural loess(Hwangtoh) as a new construction material, via alkali activation in conjunction with microwave heating, was investigated. Hwangtoh pastes with three different mix proportions of varying alkali liquid concentrations at a constant liquid-to-Hwangtoh ratio of 0.55 were prepared. Through the investigation it was found that it is possible to prepare Hwangtoh paste with $19.02N/mm^2$ at the age of 4 hours with the alkali solution of 8M NaOH and 1:4.5 mass ratio of liquefied $Na_2SiO_3$ at the curing temperature of $60^{\circ}C$ by microwave heating. The strength development at early age of the alkali activated Hwangtoh paste specimens may be attributed to both a higher rate of reaction and moisture evaporation due to microwave heating.

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References

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