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Large diameter cores (S7.4)

Use of large diameter cores as an excavation and reinstatement technique is permitted in unreinforced rigid roads with the following conditions:
  1. Large diameter cores cannot be taken within 300 mm of concrete slab corners or edges. This is to protect the integrity of the concrete pavement.
  2. Where the technique is appropriate, it must be carried out in accordance with S6.7. To match the adjoining carriageway, between 100 mm to 150 mm of the sub-base may be removed.
Large diameter cores may be used as an excavation method in continuously reinforced rigid roads. Trimming for reinstatement of the reinforcement may be required in accordance with S7.6. Re-using the excavated core is not permitted where there is a requirement to install connecting bars or lapped reinforcement.