Deterioration behaviour of super-long served concrete under indoor environmental condition

Title: Deterioration behaviour of super-long served concrete under indoor environmental condition
Author(s): K. Ma, Y. Xie, G. Long
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 629 - 635
Total Pages: 7
Nb references: 10
Language: English

Abstract: The appearances and performances of concrete and reinforcement of Xiang-Ya Hospital buildings, built in 1915, 1935 and 1955 respectively, were investigated at job-site. And the corrosion of rebar, concrete carbonation of reinforced concrete beams and floor slab elements and the microstructure of corresponding concretes were tested. Then the deterioration behaviours of the super-long served concrete as well as its corresponding mechanisms under specified ambient condition were analyzed. Results show that the average carbonation depths of concrete for 90 years, 70 years and 50 years served ages, respectively, were very large and reached 40 mm to 60 mm far beyond the thickness of concrete cover. Corrosion rate of rebar and carbonation depth of concrete were influneced greatly by ambient relative humidity.
Compared with dry environment, concrete carbonation depth was obvious larger and severe corrosion of rebar occurs under moisture environment. No corrosion of rebar was observed under long-term dry ambient though concrete cover was carbonated completely.There were numerous calcium carbonate in concrete, and some cement clinker particles were still found in concrete. These results are of great importance for deeply understanding long-term durability of reinforced concrete.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00