ABSTRACT
Established in 1973, the Hong Kong Housing Authority (HKHA) takes charge of constructing and maintaining majority of public buildings in Hong Kong. HKHA currently is maintaining more than 1,100 buildings comprising over 720,000 flats to accommodate about 2.1 million people. It builds around 15,000 flats annually. Hong Kong’s climate is sub-tropical, warm and humid. Effect of acid rain, coastal environment and use of sea water for flushing in the toilets also increase the risk of chloride contamination of the buildings. The inherent problems of earlier design also made the buildings more vulnerable to ingress of water and contaminants into the concrete.
