Concrete Repairs and Coatings to County Hospital

This building was constructed in the 1920s. It was built with large pre-cast concrete window sills and ring beams at the top of the building which were showing signs of spalling and in some cases large pieces of concrete had begun to fall off the building posing a serious concern for the safety of both the staff and members of the public using the hospital.

The NHS subsequently instructed a condition report on the current condition of all concrete elements of the County Hospital in Louth. The report confirmed one of the reasons for the problems was due to a lack of cover to the reinforcement that had resulted in the accelerated deterioration of the concrete components. The relative depths of cover to the reinforcement and carbonation indicated that in most of the areas tested, the carbonation front had encroached upon the reinforcement. The chloride ion contents were found to be less than 0.1% by weight of cement recalculated from the determined percentage by weight of sample, assuming a cement content of 14% by weight. For concrete of this age, i.e. probably 100 years old, with the carbonation recorded above and containing chlorides in the above proportions. On the basis of the above results, the externally exposed concrete forming Block 27 at Louth County Hospital, had deteriorated and become distressed mainly as a result of generalised, carbonation induced corrosion.

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"A successful structural repair project needs more than just a good contractor"

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