• Title/Summary/Keyword: ocher block.

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Improving properties of ocher block by RHA (RHA를 이용한 황토블럭의 특성 개성에 관한 연구)

  • Hoang Kieu Nga;Lee Seung Geul;Chae Chul Ho;Thuy Ng., N.;Tuan Le, A.;Kwon Hyug Moon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.379-382
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    • 2005
  • Ocher block has started to be studied recently as a new environment friendly alternative building material. This article investigates the use of Rice Husk Ask (RHA) as an additive to improve properties of the ocher block. Ocher mixtures incorporating various proportions of RHA were compared. Compressive strength at various ages of these ocher blocks was evaluated ad the resistance to wet environment was also examined. These test result help to determine the effect of RHA on such properties of the ocher block as compaction, mix proportion, compressive strength and water absorption indexes. Based on these results, the new alternative building material and low cost construction techniques might be developed through more intensive research efforts.

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Suggestion of Ocher Color Standards for Cement-Composites used on the Sidewalk (보도에 사용되는 시멘트복합체에 대한 황토색 표준의 제시)

  • Chung, Chul-Woo;Lee, Jae-Yong
    • Journal of the Korea Institute of Building Construction
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    • v.18 no.1
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    • pp.1-7
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    • 2018
  • This work aims to suggest the most proper Hwangtoh color(ocher) for sidewalks and walkways located at the central part of the city. The actual colors of Hwangtoh samples that were obtained from 3 different locations (mountain walkways) in Busan were measured. In addition, personal preferences of such Hwangtoh colors were evaluated through survey in order to provide a proper standard reference color for urban walkways and sidewalks. With respect to the chromaticity of Hwangtoh obtained in Busan, $a^*$ and $b^*$ values were found to range from 3.6 to 13.6 and 11.4 to 23.4, respectively. It was also found that $L^*$ (lightness) values of 3 different Hwangtoh samples were found to be similar. According to the results from survey, higher values of $+a^*$ (red type) and $+b^*$ (yellow type) were preferred, indicating the red and yellow color needs to be developed stronger from Hwangtoh. Based on these findings, the proper Hwangtoh color used for walkways in urban area was chosen. It was found to be $L^*$ for 32.2~45.8, $a^*$ for 5.2~13.6, and $b^*$ for 15.8~21.2, respectively.