Steel passive state stability in activated fly ash mortars

Materiales de Construccion

J. A. González¹  A. Palomo²  A. Fernández-Jiménez²  J. M. Miranda³ 

[1] Centro Nacional de Investigaciones Metalúrgicas (CENIM), CSIC. Madrid;Instituto de Ciencias de la Construcción Eduardo Torroja (IETCC), CSIC. Madrid;Instituto de Metalurgia, Universidad Autónoma de San Luis de Potosí;

关键词: corrosion;    fly ash;    alkali activation;    mortars;    mechanical strength;   

DOI  :  10.3989/mc.2010.53909

来源: DOAJ

【 摘 要 】

The present study explores the behaviour of structural steel embedded in Portland cement (OPC) mortars and NaOH- and NaOH-waterglass-activated fly ash, in the presence and absence of 2 % Cl- (CaCl2). Variations were determined in the corrosion potential (Ecorr), linear polarization resistance (Rp) and corrosion current density (icorr) under different environmental conditions (90 days at 95 % relative humidity (RH), 30 days at ≈ 30 % RH, 760 days at ≈ 95 % RH). In the absence of Cl-, fly ash mortars were able to passivate steel reinforcement, although the stability of the passive state in changing environmental conditions was found to depend heavily on the activating solution used. Steel corrosion in the presence of 2 % Cl- was observed to be similar to the corrosion reported for the material in OPC mortars.

【 授权许可】

Unknown