Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab

Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab

Bibliographic Details
Main Author: Gao, Zhicheng
Language:English
Published: University of Akron / OhioLINK 2016
Subjects:
Civil Engineering
corrosion
reinforced concrete
cracks
metal loss
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=akron1478174479305336
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-akron14781744793053362021-08-03T06:38:43Z Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab Gao, Zhicheng Civil Engineering corrosion reinforced concrete cracks metal loss Corrosion of reinforcements embedded in concrete is a worldwide problem that affects numerous reinforced concrete (RC) structures. While corrosion has always been problematic since the beginning of mining and refinery of metals, corrosion in RC structures only gained research attention during the 1960s and 1970s, following widespread use of de-icing salts on highways in United States. Since then, research has been undertaken worldwide to address corrosion issues. In this dissertation, an experimental study was conducted to characterize the structural behavior of reinforced concrete slabs subjected to accelerated corrosion in the lab.In order to make the experimental condition similar to the real service environment, the test specimens were introduced with pre-existing cracks and sustained loading was applied during the corrosion process. Accelerated corrosion of tensile steel reinforcements in RC slabs was facilitated by an accelerated corrosion process. Three different test conditions were induced in the corrosion test program: specimens without pre-existing cracks and sustained loading, specimens with pre-existing cracks but no sustained loading, and specimens with pre-existing cracks and sustained loading. In addition, different wetting and drying cycles were incorporated in the corrosion process. Expansion of longitudinal cracks along the tensile reinforcements and transverse cracks crossing the tensile reinforcements were recorded during the corrosion testing. Multiple desired corrosion levels-from low level (1%) to high level (20%)- were applied to different specimens. The gravimetric metal loss along the longitudinal direction of reinforcements was measured after the bending test. An empirical relationship was developed based on the representative specimens corroded with pre-existing cracks and sustained loading conditions for all desired corrosion levels.The epoxy-coated reinforcements and polypropylene (PP) fibers were used during casting experimental specimens to assess their corrosion resistance properties. By using the constant electric current, 10 and 20% desired corrosion levels were applied to most specimens, and 40% desired corrosion level was also applied to several test specimens with PP fibers additives to simulate the severe corrosion condition. The surface defects of epoxy-coated reinforcements and two different quantity ratios of PP fibers - 4.5 kg/m^3 and 6 kg/m^3 were considered in this study.The ultimate capacity of corroded specimens was tested after corrosion process. The average metal loss, the reduced yield strength of corroded reinforced bars and the effective cross section of the specimens can accurately predict the theoretical ultimate capacity loss compared with testing results. The critical inner expansive pressure from XFEM was applied to the developed numerical model to predict the cracking time of the cover concrete, which is defined as the severability limitation of the corroded RC structures. The proposed prediction model had been validated by comparing with the existing experiment data of uniform corrosion condition and the results show that the accuracy of developed model was acceptable to predict the serviceability of reinforced structures with corrosion damage. The effect of non-uniform corrosion condition on cracking pressure from XFEM and cracking time using developed prediction model was discussed. 2016 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1478174479305336 http://rave.ohiolink.edu/etdc/view?acc_num=akron1478174479305336 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection NDLTD
language English
sources NDLTD
topic Civil Engineering
corrosion
reinforced concrete
cracks
metal loss
spellingShingle Civil Engineering
corrosion
reinforced concrete
cracks
metal loss
Gao, Zhicheng
Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
author Gao, Zhicheng
author_facet Gao, Zhicheng
author_sort Gao, Zhicheng
title Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
title_short Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
title_full Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
title_fullStr Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
title_full_unstemmed Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab
title_sort corrosion damage of reinforcement embedded in reinforced concrete slab
publisher University of Akron / OhioLINK
publishDate 2016
url http://rave.ohiolink.edu/etdc/view?acc_num=akron1478174479305336
work_keys_str_mv AT gaozhicheng corrosiondamageofreinforcementembeddedinreinforcedconcreteslab
_version_ 1719440566401368064

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