Corrosion cracks and deflection of RC beams subjected to salty water spray under sustained load

Authors: A. Phetkaysone, T. Ishida, R. Sato
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 55 – 62
Total Pages: 8
Language: English

Abstract: Behaviour of reinforced concrete beams subjected to salty water spray under sustained load have been investigated to simulate RC structures in very severe chloride environment. As examination parameters, reinforcement stress with three levels of stress of 100, 200 and 300
N/mm2, and cover of three different thicknesses of 20, 30 and 40 mm were adopted. Investigations were carried out on the salty water penetration through flexural cracks, the interaction between sustained loading and corrosion initiation, corrosion crack widths, as well as long-term deflection.
This paper reports the results until 1380 days after sustained loading. The results showed that the depth of salty water penetration through flexural cracks as well as corrosion initiation time was not almost affected by cover thickness and reinforcement stress. However,according to visual observation, the first corrosion cracks at the bottom face of beams having the largest reinforcement stress and having the thinnest cover were developed earlier than the others, resulted in the corrosion crack widths extremely larger than the others. Additionally, it was found that the presence of flexural cracks may be a trigger of the occurrence of corrosion cracks. The results also showed that the influence of corrosion on time-dependent deflection was not observed in beams with the covers of 20, 30, 40 mm and reinforcement stresses of 100, 200 N/mm2 after approximately 900 days under sustained loading except for beam NC3-300 whose reinforcement stress is 300 N/mm2.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00