Leaching, carbonation and chloride ingress in reinforced alkali activated fly ash mortars

被引：4
作者：
Gluth, Gregor J. G. [1 ]
Hlavacek, Petr [1 ]
Reinemann, Steffi [2 ]
Ebell, Gino [2 ]
Mietz, Juergen [2 ]
机构：
[1] Bundesanstalt Mat Forsch & Prufung BAM, 7-4 Technol Construct Mat, D-12205 Berlin, Germany
[2] Bundesanstalt Mat Forsch & Prufung BAM, 7-6 Corros & Corros Protect, D-12205 Berlin, Germany
来源：
INTERNATIONAL CONFERENCE ON CONCRETE REPAIR, REHABILITATION AND RETROFITTING (ICCRRR 2018) | 2018年 / 199卷
关键词：
ACCELERATED CARBONATION; CORROSION BEHAVIOR; PORE SOLUTION; SLAG CEMENT; STEEL BARS; RESISTANCE; DURABILITY; CONCRETE;
D O I：
10.1051/matecconf/201819902025
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Alkali-activated fly ash mortars were studied with regard to durability-relevant transport coefficients and the electrochemical behaviour of embedded carbon steel bars on exposure of the mortars to leaching, carbonation and chloride penetration environments. The transport coefficients differed considerably between different formulations, being lowest for a mortar with BFS addition, but still acceptable for one of the purely fly ash-based mortars. Leaching over a period of similar to 300 days in de-ionized water did not lead to observable corrosion of the embedded steel, as shown by the electrochemical data and visual inspection of the steel. Exposure to 100 % CO2 atmosphere caused steel depassivation within approx. two weeks; in addition, indications of a deterioration of the mortar were observed. The results are discussed in the context of the different reaction products expected in high- and low-Ca alkali-activated binders, and the alterations caused by leaching and carbonation.
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页数：7
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