- S7.4.1
- Use of large diameter cores as an excavation and reinstatement technique is permitted in unreinforced rigid roads with the following conditions:
- 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.
- 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.
- S7.4.2
- 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.
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