• Title/Summary/Keyword: microfine cement(MC)

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Grouting Effects of Microfine Cement in the Rock-based Sites (시멘트계 주입재료의 암반그라우팅 효과)

  • Kong, Jinyoung;Kim, Chanki;Park, Jinhwan;Chun, Byungsik
    • Journal of the Korean GEO-environmental Society
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    • v.11 no.12
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    • pp.37-45
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    • 2010
  • The particle size of microfine cement(MC) is so small that it can be injected into silt layer. But the more particle size is miniaturized, the more the cohesion increases. This phenomenon results in the decrease of the perviousness of MC. In this study, the grouting effects of microfine cement with superplasticizer to maintain cohesion low and that of normal cement were investigated in rock. To estimate the grouting effects, TCR/RQD test for rock quality, lugeon test, borehole loading test for coefficients of elastic and deformative stress, borehole shear test for shear stress, detection p~q~t(pressure~flow~time) chart tests were carried out. The results using MC show a better permeability, modulus of elasticity, deformation, charge per unit, and recover efficiency of grouting material than those of ordinary portland cement except shear stress.

A Case Study of Remediation Grouting for Stopping Leakage of Concrete Dam Base (콘크리트 댐 기초 누수방지 보수그라우팅 사례)

  • 천병식;김진춘;최영철
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.449-456
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    • 2000
  • Remediation grouting has been widely used for the rehabilitation of various civil works like hydraulic and traffic structures. Recently there were some cases of remediation grouting for repairing old dams in korea. So this study will describe the case of remediation grouting of the concrete dam base located east-northern part of Seoul. We use Lugeon Test and Borehole Image Processing System(BIPS) for estimating the effectiveness of remediation grouting of this project. As the results of this study, we could find the lots of joints between the old concrete body and the weathered rock base. So the about 30% quantity of total cement grouts was injected at the boundary surface between concrete and rock base. And Lugeon Test and BIPS could be compared relatively because BIPS results could be presented quantitatively as well as qualitative analysis. Finally, we could find microfine cement was very effectively injected to the fine fissured concrete body compared with ordinary portland cement, but there was little injectability differences beteween microfine cement and ordinary portland cement at the large cracks or cavities were developed rock base.

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