Rotary Bored Piling Specialists

Potential Concrete Shaft Integrity Problems

Pile integrity problems are very serious as often they may only be discovered by the failure of structure they are intended to support, resulting of costs far greater than the cost of the pile itself.

Primary Reason
The inability of the concrete to flow to form the required cross section. Insufficient concrete pressure to resist lateral ground pressure. Unintended deleterious material mixing with the concrete. Damage to the concrete following the initial set, but prior to strength gain.
Possible Causes

Inadequate concrete flow between the bars of the reinforcing cage, creating “lack of cover” or inclusions at the side of the pile

Concrete pressure in the column of concrete is less than external lateral ground pressure / water pressure, causing material ingress into the concrete.

Soil Inclusions in the concrete shaft.

Concrete which has undergone its initial set is easily damaged by movement.

Likely Scenarios
Possible Causes
Inadequate concrete flow between the bars of the reinforcing cage, creating “lack of cover” or inclusions at the side of the pile
Likely Scenario
  • Poorly designed concrete mix with insufficient workability/flowability & possible aggregate size too great for the bar spacing.
Possible Causes
Concrete pressure in the column of concrete is less than external lateral ground pressure / water pressure, causing material ingress into the concrete.
Likely Scenario
  • Insufficient concrete head in the temporary casing during casing withdrawal.
Possible Causes
Soil Inclusions in the concrete shaft.
Likely Scenario
  • Soil inclusions are most likely occur when the pile bore has not been properly cleaned, or when under drilling fluid, the fluid has not been sufficiently cleaned, of suspended fines which settle out onto the concrete.
Possible Causes
Concrete which has undergone its initial set is easily damaged by movement.
Likely Scenario
  • Concrete which has started to set before the removal of temporary casing may be damaged by the removal of the casing or any other event which may cause the concrete to be displaced.
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