Title : STATE-OF-THE-ART DIAGNOSIS, REPAIR AND RETROFITTING TECHNOLOGIES FOR CONCRETE STRUCTURES IN JAPAN
Authors : Takafumi Noguchi Department of Architecture, The University of Tokyo, Japan, Email: noguchi@bme.arch.t.u-tokyo.ac.jp
Publication : December 19-21, 2013
Volume :
Pages : 110-124
Price : 250
Abstract : A large number of condominiums built after the period of high economic growth in the 1960s in Japan, which are facing deterioration such as cracking, carbonation, chloride attack, frost damage, chemical erosion, and alkali-silica reaction in concrete, delamination and spalling in tile and mortar, and chalking and cracking in waterproofing layers, are expected to reach the initially assumed service life. However, techniques and rules to serve as the basis for repair/renovation have yet to be fully established due to the relatively short history of condominiums in Japan. This paper outlines a typical flow of repair/renovation, representative investigation/diagnosis techniques including non- and semi-destructive tests related to the durability of building materials and utility piping, and repair/renovation techniques for concrete and external walls, waterproofing layers, finishing materials and utility piping. The cost of repair/renovation is also discussed from based on the relationship between the progress of deterioration and the necessary techniques. It is essential to carry out systematic maintenance and proactive repair/renovation and there needs a standard for investigation/diagnosis and design and execution of repair/renovation of reinforced concrete buildings. A committee of Architectural Institute of Japan is formulating the standard.