The influence of carbonation process on concrete bridges and durability in Estonian practice

3rd International Conference on Innovative Materials, Structures and Technologies

Liisma, E.^1 ; Sein, S.^1 ; Järvpõld, M.^1

Tallinn University of Technology, School of Engineering, Department of Civil Engineering and Architecture, Ehitajate St. 5, Tallinn

19086, Estonia^1

关键词: Accelerated carbonation;    Bridge engineering;    Carbonation process;    Compressive strength of concrete;    Degradation mechanism;    Environmental influences;    Exponential increase;    Natural carbonations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012072/pdf
DOI  :  10.1088/1757-899X/251/1/012072

来源: IOP

【 摘 要 】

Concrete as one of the most widely used construction material in building industry, has considerable implementing in bridge engineering due to its extensive number of effective technical characteristics. However, according to exploitation environment, there are substantial factors such as aggressive liquids (e.g. deiced salts, sulfates, etc), rapid temperature alterations and the increasing rate of CO2to take into account predicting actual retained service life of concrete structure and the need of repairmen to increase the lifespan of the bridge. According to several measuring, concentration of atmospheric CO2is reported linearly increasing and is modeled to appear as exponential increase in the next decade. This environmental influence leads to accelerated carbonation process of concrete and brings up the importance of its potential untimely degradation mechanism. Hence, the main aim of this research is to give an analyzed overview of the carbonation depths of selection of 11 concrete bridges in Estonia built in the period of 1976-2007 and their relation with compressive strength of concrete. In addition to in situ tests, laboratory research was performed to understand natural carbonation rate and compressive strength relations of concrete.