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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24082

Title: A Study on the Efficiency of Electrochemical Realkalisation of Carbonated Concrete
Authors: Weichung Yeih;Jiang Jhy Chang
Contributors: NTOU:Department of Harbor and River Engineering
Keywords: Electrochemical realkalisation;Realkalisation width;Mechanical properties;Carbonated concrete
Date: 2005-09
Issue Date: 2011-10-20T08:10:15Z
Publisher: Construction and Building Materials
Abstract: Abstract:In this paper, the efficiency of electrochemical realkalisation of a carbonated concrete is investigated. The realkalisation width, pH value nearby the rebar, the open circuit potential and the instantaneous corrosion rate are used to evaluate the performance of electrochemical realkalisation. In addition, several mechanical properties including compressive strength, elastic modulus and bond strength are determined to check whether the electrochemical realkalisation process degrades them. Water absorption test and four-probe electrical resistivity are measured to investigate the densification of pore structure. It is found that all properties show apparent trends with respect to the influence parameter, defined by the product of the realkalisation current density and the realkalisation period. As the influence parameter increases, pH value increases and the realkalisation width expands. Consequently, the open circuit potential indicates that the realkalisation successfully rebuilds the passive film on rebar and the instantaneous corrosion rate decreases dramatically. Compressive strength, elastic modulus and bond strength for realkalised specimens all decrease compared to the carbonated specimens due to the degradation effect from the cathodic current. However, they still exceed those of the control specimens due to the carbonation product. The resistivity and water absorption demonstrates that the realkalisation further condenses pore structure.
Relation: 19(7), pp.516-524
URI: http://ntour.ntou.edu.tw/handle/987654321/24082
Appears in Collections:[河海工程學系] 期刊論文

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