Investigations of corrosion due to calcium leaching

Author(s): Stefanie von Greve-Dierfeld, Yves Schiegg, Fritz Hunkeler
Paper category: Proceedings
Book title: Proceedings of the International Conference on Sustainable Materials Systems and Structures (SMSS2019) Durability, Monitoring and Repair of Structures
Editor(s): Ana Baričević, Marija Jelčić Rukavina, Domagoj Damjanović, Maurizio Guadagnini
ISBN: 978-2-35158-217-6
e-ISBN: 978-2-35158-218-3
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 341-349
Total Pages: 813
Language: English

Abstract: This paper presents on investigations performed in order to assess the corrosion risk due to calcium (Ca-)leaching in saturated ammonium nitrate solution. The results show, that the time for corrosion initiation increases with the CaO content at the same w/b ratio. Leaching investigations and electrochemical measurements give only little differences in initiation times in this testing protocol for OPC, and OPC blended with fly ash (Fa) and lime stone (LS). But for OPC blended with high amounts of (blast furnace) slag, depassivation testing gives app. two times longer initiation phase than determined from electrochemical measurements and rebar investigation. pH from powder suspension at visible corrosion initiation (pH-crit) for LS, FA and slag blended cement mortars were in the range of 8.0 ≤ pH ≤ 8.5 and for plain OPC at 8.8 ≤ pH ≤ 9.2 and did not change significantly during corrosion process, except for OPC.

Online publication :2019
Publication type : full_text
Public price (Euros) : 00