海外用リーフレット／ CDM
57期 A3 天地297ミリ×左右210ミリ

CDM SYSTEM
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CDM is a soft soil stabilization method which mixes
cement slurry with soft soil in situ to attain a required
strength. Soft soil is stabilized by the 2-phase chemicalreaction. A hydration reaction occurs and an ettringite

Features of CDM Method
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 $!% 'of capillary crystals is generated when the cementmixes with water. Then a pozzolanic reaction follows,
as the age grows, where the hydration product reacts
with the clay minerals in the soil.

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CDM method is a soft soil stabilization method
which mixes soft soil in situ with cement slurry
to produce soil-cement with higher strengthand lower compressibility than the native soil.

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Required strength can be obtained reliably bysetting a proper cement dosage according tothe conditions of soil to be treated.

/  $  ) The drilling and mixing operation is low noiseand low vibration, and does not generate dust.
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The computerized operation system controls,monitors, and records the drilling rate, mixing
depth, auger rotational speed, and grout
injection rate. This operation system minimizes
human errors and provides reliable soil-cement
product as the design intended.

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The mixing machine used is mobile and can beeasily relocated to the next soil mixing location atsite. The grout production and supply are automaticwhich saves labor while maintaining efficiency.

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Soil-cement gains strength and reduces
compressibility faster than conventional soil
improvement methods and shortens theconstruction period.

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Termina
to meetlow nois
becauseconstructank fouguidelin
result, Cwas adother ea7.   1 %23 ,'Since its development in 1975 by the Port andHarbor Research Institute of Japanese Ministryof Transportation, more than 1,500 projects
have been completed. The total volume of soilcement produced exceeds 20 million cubic
meters. It is also proven to be effective forliquefaction prevention.

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CDM SYSTEMCase study  !     )-(, ;3 ()4( /*(;7-(, '()-(, ,   * ,  () > ; & ()% &   (%(  <((. 4 9 5?)%.)'(%(  8)   8  % )  5* %   .
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Two new oil storage tanks were planned to constructat the Kagoshima Oil Terminal owned by Tozai Oil
Terminal Co.,Ltd. to supply more petroleum productto meet increasing demand for energy in Japan. A
low noise and low vibration method were required
because other tanks should be in operation during
construction. Moreover the ground improvement for
tank foundation should be designed to comform theguideline prepared by the Fire Defence Agency. As aresult, Cement Deep Mixing Method (CDM Method)
was adopted in order to prevent liquefaction andother eathquake damages.
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2006.06
60.06