Influence of blended cement type on concrete carbonation, capillary uptake and chloride penetration

Author(s): A. Šajna, V. Bras, L. Završnik
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: 499 - 506
Total Pages: 8
Language: English

Abstract: 
Carbonation allegedly increases mechanical strength of concrete on one hand, but it decreases its alkalinity on the other. At a pH below 10 the steel's thin layer of surface passivation dissolves causing corrosion of steel reinforcement.
In the paper test results of an extensive research program including measurement of resistance to carbonation of concretes prepared with different types of blended cements and measurement of influence of carbonation on capillary absorption and on resistance to chloride penetration are presented.
The test results are analysed and compared to EN 206-1, Eurocode 2 and some national requirements for durable structures exposed to carbonation induced corrosion (exposure classes XC). It is shown that requirements given in the standards do not guarantee the required structural service life when blended cement concrete is used in carbonation induced corrosion environment. In such cases performance based determination of carbonation depth is essential.

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