Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment

Material surface time of wetness (TOW) and temperature (T) are critical variables that influence the corrosion behavior of reinforced steel bars in concrete, and concrete durability. In concrete structures, both variables are indirectly dependent on the atmospheric relative humidity/ temperature com...

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Autores principales: Castro-Borges,Pedro, Veleva,Lucien
Lenguaje:English
Publicado: Escuela de Construcción Civil, Pontificia Universidad Católica de Chile 2015
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Acceso en línea:http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2015000200009
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spelling oai:scielo:S0718-915X20150002000092015-09-03Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical EnvironmentCastro-Borges,PedroVeleva,Lucien Concrete Tropical Humid Climate Rural-Urban Environment Internal Distribution of Time of Wetness Temperature Material surface time of wetness (TOW) and temperature (T) are critical variables that influence the corrosion behavior of reinforced steel bars in concrete, and concrete durability. In concrete structures, both variables are indirectly dependent on the atmospheric relative humidity/ temperature complex, and specific structural characteristics: concrete composition, water/cement ratio, curing time, geometry and orientation in the environment. Concrete internal TOW and T distribution data were collected using Cu/Au electronic sensors arranged at 15, 40, 65 and 75 mm depths in a concrete block (300 x 300 x 150 mm; w/c 0.5) exposed for one year in a rural-urban humid tropical climate in southeast Mexico. Concrete internal TOW allows structure designers to define concrete cover thickness over steel reinforcement bars. The results indicate that under the tested exposure conditions, the side of the block with the highest TOW values (west) would require a thicker concrete cover than that with lower values (east). Longer TOW can increase the possible permeation of gases such as CO2, and consequent concrete carbonation, as well as lead to loss of the passive state in steel reinforcement and initiation of the corrosion process.info:eu-repo/semantics/openAccessEscuela de Construcción Civil, Pontificia Universidad Católica de ChileRevista de la construcción v.14 n.2 20152015-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2015000200009en10.4067/S0718-915X2015000200009
institution Scielo Chile
collection Scielo Chile
language English
topic Concrete
Tropical Humid Climate
Rural-Urban Environment
Internal Distribution of Time of Wetness
Temperature
spellingShingle Concrete
Tropical Humid Climate
Rural-Urban Environment
Internal Distribution of Time of Wetness
Temperature
Castro-Borges,Pedro
Veleva,Lucien
Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
description Material surface time of wetness (TOW) and temperature (T) are critical variables that influence the corrosion behavior of reinforced steel bars in concrete, and concrete durability. In concrete structures, both variables are indirectly dependent on the atmospheric relative humidity/ temperature complex, and specific structural characteristics: concrete composition, water/cement ratio, curing time, geometry and orientation in the environment. Concrete internal TOW and T distribution data were collected using Cu/Au electronic sensors arranged at 15, 40, 65 and 75 mm depths in a concrete block (300 x 300 x 150 mm; w/c 0.5) exposed for one year in a rural-urban humid tropical climate in southeast Mexico. Concrete internal TOW allows structure designers to define concrete cover thickness over steel reinforcement bars. The results indicate that under the tested exposure conditions, the side of the block with the highest TOW values (west) would require a thicker concrete cover than that with lower values (east). Longer TOW can increase the possible permeation of gases such as CO2, and consequent concrete carbonation, as well as lead to loss of the passive state in steel reinforcement and initiation of the corrosion process.
author Castro-Borges,Pedro
Veleva,Lucien
author_facet Castro-Borges,Pedro
Veleva,Lucien
author_sort Castro-Borges,Pedro
title Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
title_short Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
title_full Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
title_fullStr Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
title_full_unstemmed Time of Wetness and HR-T Complex as Tools for Corrosion Risk Evaluation in a Concrete Block Exposed to a Humid Tropical Environment
title_sort time of wetness and hr-t complex as tools for corrosion risk evaluation in a concrete block exposed to a humid tropical environment
publisher Escuela de Construcción Civil, Pontificia Universidad Católica de Chile
publishDate 2015
url http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-915X2015000200009
work_keys_str_mv AT castroborgespedro timeofwetnessandhrtcomplexastoolsforcorrosionriskevaluationinaconcreteblockexposedtoahumidtropicalenvironment
AT velevalucien timeofwetnessandhrtcomplexastoolsforcorrosionriskevaluationinaconcreteblockexposedtoahumidtropicalenvironment
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