Theoretical Model of Rust Expansion Cracking of Concrete Structure Based on the Initial Defect Shape

doi:10.12068/j.issn.1005-3026.2020.07.017

Journal of Northeastern University Natural Science ›› 2020, Vol. 41 ›› Issue (7): 1020-1026.DOI: 10.12068/j.issn.1005-3026.2020.07.017

• Resources & Civil Engineering • Previous Articles Next Articles

Theoretical Model of Rust Expansion Cracking of Concrete Structure Based on the Initial Defect Shape

LUN Pei-yuan^1,2， ZHANG Xiao-gang^1,3， ZHANG Qiang²， ZHAO Ran¹

1. School of Civil Engineering， Central South University， Changsha 410075，China; 2. College of Architecture and Civil Engineering， Beijing University of Technology， Beijing 100022 ，China; 3. School of Civil and Traffic Engineering， Shenzhen University， Shenzhen 518060， China.

Received:2019-04-06 Revised:2019-04-06 Online:2020-07-15 Published:2020-07-15
Contact: ZHANG Qiang
About author:-
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Abstract

Abstract: In order to consider the influence of the initial defect shape of materials， it was assumed to be a three-dimensional semi-ellipse. Based on the theory of fracture mechanics， the expansion process of the rust expansion cracking can be divided as two critical stages: the initial cracking stage and the complete cracking stage， which were both analyzed. A prediction model of rust expansion force and cracking time was established when concrete cover cracks. The proposed model was verified using the pre-existing indoor corrosion test and field test data， and the results showed that the prediction model is reasonable. On this basis， parameter sensitivity analyses， such as the length of the initial defect， the concrete cover thickness， the reinforcing bar radius， the relative cover thickness were analyzed， the results showed that the service performance of RC structures can be improved by increasing the concrete cover thickness and the relative cover thickness.

Key words: corrosion of reinforcing bar, the initial defect shape, critical rust expansion force, cracking time, durability.

CLC Number:

TU375

LUN Pei-yuan， ZHANG Xiao-gang， ZHANG Qiang， ZHAO Ran. Theoretical Model of Rust Expansion Cracking of Concrete Structure Based on the Initial Defect Shape[J]. Journal of Northeastern University Natural Science, 2020, 41(7): 1020-1026.

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Theoretical Model of Rust Expansion Cracking of Concrete Structure Based on the Initial Defect Shape

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