Acción externa acelerada de sulfatos y cloruros en el estudio de la corrosión del acero en tracción en el hormigón armado

M. A. G. Silva; M. P. Cunha; A. Pinho-Ramos; B. Sena da Fonseca; F. F. S. Pinho

doi:10.3989/mc.2017.10116

Authors

M. A. G. Silva Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa https://orcid.org/0000-0002-0379-9642
M. P. Cunha Instituto Universitário da Maia https://orcid.org/0000-0002-5889-5543
A. Pinho-Ramos Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa https://orcid.org/0000-0001-9496-4991
B. Sena da Fonseca Centro de Química Estrutural-CQE, Instituto Superior Técnico, Universidade de Lisboa https://orcid.org/0000-0003-2166-0430
F. F. S. Pinho CERIS, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa https://orcid.org/0000-0003-0344-1867

DOI:

https://doi.org/10.3989/mc.2017.10116

Keywords:

Steel, Concrete, Sulphate attack, Durability, Corrosion

Abstract

Corrosion of the reinforcing steel may cause significant loss of strength of reinforced concrete structures. The study focuses on accelerating such corrosion and examining the degradation of (i) the compressive strength of concrete due to sodium sulfate in a wet atmosphere; and (ii) the flexural strength by a solution of sodium sulfate and sodium chloride. Three types of concrete were used and different beam specimens were reinforced by steel rebars of different diameters (6, 8 and 10mm), part of the beams being pre-cracked. The concrete with least strength allowed higher sulfate penetration along the entire process and the compressive strength increased slightly, possibly due to lower porosity of concrete after contamination. The results of the flexural tests showed decrease of strength in all cases. Pre-cracked beams exhibited smaller influence of porosity of concrete. Beams with 6mm rebars showed the largest loss of strength due to the contamination and corrosion process

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