Removing damaged or poor quality concrete from sensitive structures such as bridges, dam walls, tunnels, docks, harbours, multi-storey car parking decks and runways, using pneumatic and hydraulic breakers or road milling machines, is universally accepted as being inefficient and even damaging to the structure being repaired. These once favoured techniques are now outdated and indiscriminate as they remove and leave both good and bad concrete and cause damage to the remaining healthy and sound concrete and steel reinforcement, as well as injuring jackhammer operators.
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