ABSTRACT
In 2007 Guernsey Harbours commissioned a review of Berths 4, 5 & 6 which included a structural condition survey of the facilities. The report recommended that the existing rail-mounted cranes be replaced with two modern mobile, wheeled, harbour cranes and associated refurbishment and strengthening work to quay structures be carried out. The commission was extended to produce a detailed defect assessment specification and tender package which identified the methods and extent of the structural investigation and testing required. A detailed assessment of the reinforced concrete and metallic structures was undertaken. There were significant areas of cracked and spalling concrete identified during the detailed investigation that required repair prior to the Impressed Current Cathodic Protection (ICCP) installation. Primarily these repairs were to the primary and secondary downstand beams. The beam repairs were undertaken by using hydro-demolition techniques to remove defective areas of concrete and reinstating using a pre-bagged flowable high performance repair concrete compatible with the ICCP system.
