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Indexed by:期刊论文

Date of Publication:2010-04-01

Journal:JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY

Included Journals:SCIE、EI

Volume:17

Issue:2

Page Number:388-393

ISSN No.:1005-9784

Key Words:concrete; bond strength; degradation; electrochemical chloride extraction; freeze-thaw cycles

Abstract:The effect of electrochemical chloride extraction (ECE) on bond strength between steel bar and freeze-thaw concrete contaminated by chloride was experimentally investigated for beam specimens with dimensions of 100 mmx100 mmx400 mm. During the experiment, 3% NaCl (vs mass of cement, mass fraction) was mixed into concrete to simulate chloride contamination, and the specimens experienced 0, 25, 50, 75 freeze-thaw cycles before ECE. In the process of ECE, different current densities and durations were adopted. It is indicated that the bond strength between reinforcement and concrete decreases with the increase of freeze-thaw cycles; the more the current and the electric quantity of ECE are, the more the loss of bond strength is; and the largest loss is up to 58.7%. So, it is important to choose proper parameters of ECE for the reinforced concrete structures contaminated by chloride and subjected to freeze-thaw cycles.