2024-03-29T06:19:02Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/199232021-06-11T10:47:40Zcom_10261_66com_10261_3com_10261_23col_10261_319col_10261_276
00925njm 22002777a 4500
dc
Bastidas, David M.
author
Fernández-Jiménez, Ana
author
Palomo, Ángel
author
González, J. A.
author
2008-04
The main reason for the premature failure of reinforced concrete structures (RCS) is corrosion of the reinforcements. The use of new mortars based on activated fly ash, an alternative to conventional portland cement, requires extensive research in order to check its passivating properties for reinforcements and the instability or permanence of the passive state achieved. The present paper studies this objective, analysing the passivating capacity of specimens manufactured with three different fly ash mortars treated with three activators and the stability of the passive state under the effect of 0%, 0.2%, 0.4% and 2% chloride additions in relation to the binder material, in an environment of apparently constant humidity and in humidity cycles. The evolution with time of corrosion potential (Ecorr) and polarisation resistance (Rp) was studied. Polarisation curves and time constants (τ) were also assessed for some specimens using short duration galvanostatic pulses.
Corrosion Science 50(4): 1058-1065 (2008)
0010-938X
http://hdl.handle.net/10261/19923
10.1016/j.corsci.2007.11.016
Steel
Reinforced concrete
Fly ash mortar
Portland cement
Passive–active transition
A study on the passive state stability of steel embedded in activated fly ash mortars