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1) Use Immersion or Needle Vibrators with smaller diameter of rod.
2) External or Shutter Viberation. Forkwork should be strong enough for this.
3) Use of Admixture. To reduce air entraped between aggreagtes and to incease workabiltiy of concrete to avoid any defects in concrete. e.g. honey comb etc.
you can use self compacting concrete (SCC)