Influence of finishing materials on carbonation suppression of concrete in existing structures

Author(s): A. Nakai, K-i. Imamoto, C. Kiyohara, S. Sato, A.Tanaka , K. Niwano, S. Amemiya
Paper category: Workshop
Book title: RILEM International workshop on performance-based specification and control of concrete durability
Editor(s): D. Bjegović, H. Beushausen, M. Serdar
ISBN: 978-2-35158-135-3
e-ISBN: 978-2-35158-136-0
Pages: 377 - 384
Total Pages: 8
Language: English

Abstract: 
The condition assessment of existing reinforced concrete (RC) structures is quite important for realizing a sustainable society. In Japan, concrete structures have been used since 1900s in big towns, and they survived the Great Kanto Earthquake of 1923. Concrete structures then attracted attention as earthquake-resistant structures: therefore, these structures have been widely used in Japan. However, these structures have been deteriorating with time, and thus repair and retrofitting of existing structures are necessary to maintain them in a usable condition. The main cause of concrete deterioration is carbonation. Carbonation ingress is affected not only by concrete quality itself but also by the use of finishing materials. However, the influence of finishing on concrete carbonation in actual structures is not well understood.Hence, the accumulation of information on concrete carbonation of actual structures would be valuable for establishing a maintenance strategy for RC structures.
This study reports on the condition assessment of RC structures, from the viewpoints of visual observation, cracks on outer walls, and concrete quality such as compressive strength and carbonation depth evaluated using core samples from the structures. In addition, a nondestructive air-permeability test was performed.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00