Strategies and Implementation of Structural Repairs to High Rise Housing Blocks in Hong Kong

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Title: Strategies and Implementation of Structural Repairs to High Rise Housing Blocks in Hong Kong

Author(s): R. A. Bates, M. V. Harley, G. G. Payne, and R. A. M. Watkins

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 789-804

Keywords: concrete cores; durability; high-rise buildings; inspection; maintenance; repairs; research; residential housing; spalling; strengthening; Construction

Date: 11/1/1991

Abstract:
The Hong Kong Housing Authority maintains an extensive portfolio of property that includes over 700,000 flats. In 1985 it embarked on a major structural investigation of 828 housing blocks, and a US $200 million repair program. The investigation has involved over one million visual inspections, testing of 30,000 concrete cores and an extensive nondestructive testing program. It was necessary to develop methods of appraising low strength concrete structures, and unique strengthening and repair techniques. The paper examines the development and implementation of an investigation and maintenance strategy that takes into consideration the condition, life expectancy, and environment of each building. The paper focuses on the way priorities were determined and research undertaken. It discusses the public relations and management of a program that has required the strengthening of 92 high-rise buildings, and 400,000 mý of spalling repairs over a six year period.