Seismic Retrofitting of Corroded Reinforced Concrete Columns Using Ultra-High-Performance Concrete Jacketing
This paper investigates the efficacy of ultra-high-performance concrete (UHPC) jacketing as an option for seismic retrofit (repair or strengthening) of structural components that have been damaged by reinforcement corrosion. Previous work has illustrated that UHPC cover fully mitigates corrosion in...
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| Veröffentlicht in: | ACI structural journal 2024-07, Vol.121 (4), p.87-99 |
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| creator | El-Joukhadar, Nicolas Pantazopoulou, S J |
| description | This paper investigates the efficacy of ultra-high-performance concrete (UHPC) jacketing as an option for seismic retrofit (repair or strengthening) of structural components that have been damaged by reinforcement corrosion. Previous work has illustrated that UHPC cover fully mitigates corrosion in the absence of service cracks and significantly reduces the corrosion rate in the case of preexisting cracks. In the present experimental study, cover replacement by UHPC is used to repair and strengthen corroded columns. Six lap-spliced columns designed based on pre-1970s design standards were constructed and subjected to artificial corrosion. Parameters of the investigation were: a) the aspect ratio of the specimens; b) the bar size (to account for the effect of bar diameter loss on bond); and c) the condition of the specimen (repair or strengthening after damage due to application of simulated seismic load to assess the effectiveness of retrofitting corroded components, even after having endured earthquake damage). The results show that thin UHPC jackets replacing conventional concrete cover suffice to impart a significant increase in strength and ductility of the columns. The jackets also endow the corroded and unconfined lap splices with significant force and deformation development capacity, thus alleviating a source of excessive column flexibility in existing construction. |
| doi_str_mv | 10.14359/51740572 |
| format | Article |
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Previous work has illustrated that UHPC cover fully mitigates corrosion in the absence of service cracks and significantly reduces the corrosion rate in the case of preexisting cracks. In the present experimental study, cover replacement by UHPC is used to repair and strengthen corroded columns. Six lap-spliced columns designed based on pre-1970s design standards were constructed and subjected to artificial corrosion. Parameters of the investigation were: a) the aspect ratio of the specimens; b) the bar size (to account for the effect of bar diameter loss on bond); and c) the condition of the specimen (repair or strengthening after damage due to application of simulated seismic load to assess the effectiveness of retrofitting corroded components, even after having endured earthquake damage). The results show that thin UHPC jackets replacing conventional concrete cover suffice to impart a significant increase in strength and ductility of the columns. The jackets also endow the corroded and unconfined lap splices with significant force and deformation development capacity, thus alleviating a source of excessive column flexibility in existing construction.</description><identifier>ISSN: 0889-3241</identifier><identifier>EISSN: 0889-3241</identifier><identifier>EISSN: 1944-7361</identifier><identifier>DOI: 10.14359/51740572</identifier><language>eng</language><publisher>Farmington Hills: American Concrete Institute</publisher><subject>Aspect ratio ; Concrete ; Concrete columns ; Corrosion ; Corrosion effects ; Corrosion rate ; Corrosion tests ; Cracks ; Damage assessment ; Deformation effects ; Design ; Design parameters ; Design standards ; Ductility ; Ductility tests ; Earthquake construction ; Earthquake damage ; Earthquake loads ; Earthquakes ; Effectiveness ; Performance evaluation ; Polyvinyl alcohol ; Reinforced concrete ; Retrofitting ; Seismic activity ; Seismic engineering ; Seismic response ; Strengthening ; Stress corrosion cracking ; Ultra high performance concrete</subject><ispartof>ACI structural journal, 2024-07, Vol.121 (4), p.87-99</ispartof><rights>Copyright American Concrete Institute Jul 2024</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c147t-bba16714c932f33fc3e38b8f5793765534dc33a0c4a97a1aaea4567500c8b0f33</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids></links><search><creatorcontrib>El-Joukhadar, Nicolas</creatorcontrib><creatorcontrib>Pantazopoulou, S J</creatorcontrib><title>Seismic Retrofitting of Corroded Reinforced Concrete Columns Using Ultra-High-Performance Concrete Jacketing</title><title>ACI structural journal</title><description>This paper investigates the efficacy of ultra-high-performance concrete (UHPC) jacketing as an option for seismic retrofit (repair or strengthening) of structural components that have been damaged by reinforcement corrosion. Previous work has illustrated that UHPC cover fully mitigates corrosion in the absence of service cracks and significantly reduces the corrosion rate in the case of preexisting cracks. In the present experimental study, cover replacement by UHPC is used to repair and strengthen corroded columns. Six lap-spliced columns designed based on pre-1970s design standards were constructed and subjected to artificial corrosion. Parameters of the investigation were: a) the aspect ratio of the specimens; b) the bar size (to account for the effect of bar diameter loss on bond); and c) the condition of the specimen (repair or strengthening after damage due to application of simulated seismic load to assess the effectiveness of retrofitting corroded components, even after having endured earthquake damage). The results show that thin UHPC jackets replacing conventional concrete cover suffice to impart a significant increase in strength and ductility of the columns. The jackets also endow the corroded and unconfined lap splices with significant force and deformation development capacity, thus alleviating a source of excessive column flexibility in existing construction.</description><subject>Aspect ratio</subject><subject>Concrete</subject><subject>Concrete columns</subject><subject>Corrosion</subject><subject>Corrosion effects</subject><subject>Corrosion rate</subject><subject>Corrosion tests</subject><subject>Cracks</subject><subject>Damage assessment</subject><subject>Deformation effects</subject><subject>Design</subject><subject>Design parameters</subject><subject>Design standards</subject><subject>Ductility</subject><subject>Ductility tests</subject><subject>Earthquake construction</subject><subject>Earthquake damage</subject><subject>Earthquake loads</subject><subject>Earthquakes</subject><subject>Effectiveness</subject><subject>Performance evaluation</subject><subject>Polyvinyl alcohol</subject><subject>Reinforced concrete</subject><subject>Retrofitting</subject><subject>Seismic activity</subject><subject>Seismic engineering</subject><subject>Seismic response</subject><subject>Strengthening</subject><subject>Stress corrosion cracking</subject><subject>Ultra high performance concrete</subject><issn>0889-3241</issn><issn>0889-3241</issn><issn>1944-7361</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNpNkLFOwzAQhi0EEqUw8AaRmBgCds6OnRFF0IIqgYDOkePaxSWJi-0MvD0uBcF0n3Tf_Sf9CJ0TfEUosOqaEU4x48UBmmAhqhwKSg7_8TE6CWGDMeAC6AR1L9qG3qrsWUfvjI3RDuvMmax23ruVXqWFHYzzKmHtBuV11Am6sR9Ctgw7e9lFL_O5Xb_lT9ont5eD0n_2g1Tvepd7io6M7II--5lTtLy7fa3n-eJxdl_fLHJFKI9520pSckJVBYUBMAo0iFYYxivgJWNAVwpAYkVlxSWRUkvKSs4wVqLF6WKKLva5W-8-Rh1is3GjH9LLBrDAvATBWbIu95byLgSvTbP1tpf-syG4-S6z-S0TvgBhbWa7</recordid><startdate>20240701</startdate><enddate>20240701</enddate><creator>El-Joukhadar, Nicolas</creator><creator>Pantazopoulou, S J</creator><general>American Concrete Institute</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>4T-</scope><scope>4U-</scope><scope>7QQ</scope><scope>7SR</scope><scope>7XB</scope><scope>88I</scope><scope>8BQ</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8G5</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>HCIFZ</scope><scope>JG9</scope><scope>KR7</scope><scope>L6V</scope><scope>M2O</scope><scope>M2P</scope><scope>M7S</scope><scope>MBDVC</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20240701</creationdate><title>Seismic Retrofitting of Corroded Reinforced Concrete Columns Using Ultra-High-Performance Concrete Jacketing</title><author>El-Joukhadar, Nicolas ; Pantazopoulou, S J</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c147t-bba16714c932f33fc3e38b8f5793765534dc33a0c4a97a1aaea4567500c8b0f33</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Aspect ratio</topic><topic>Concrete</topic><topic>Concrete columns</topic><topic>Corrosion</topic><topic>Corrosion effects</topic><topic>Corrosion rate</topic><topic>Corrosion tests</topic><topic>Cracks</topic><topic>Damage assessment</topic><topic>Deformation effects</topic><topic>Design</topic><topic>Design parameters</topic><topic>Design standards</topic><topic>Ductility</topic><topic>Ductility tests</topic><topic>Earthquake construction</topic><topic>Earthquake damage</topic><topic>Earthquake loads</topic><topic>Earthquakes</topic><topic>Effectiveness</topic><topic>Performance evaluation</topic><topic>Polyvinyl alcohol</topic><topic>Reinforced concrete</topic><topic>Retrofitting</topic><topic>Seismic activity</topic><topic>Seismic engineering</topic><topic>Seismic response</topic><topic>Strengthening</topic><topic>Stress corrosion cracking</topic><topic>Ultra high performance concrete</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>El-Joukhadar, Nicolas</creatorcontrib><creatorcontrib>Pantazopoulou, S J</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Docstoc</collection><collection>University Readers</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>SciTech Premium Collection</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><collection>ProQuest Engineering Collection</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Research Library (Corporate)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><jtitle>ACI structural journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>El-Joukhadar, Nicolas</au><au>Pantazopoulou, S J</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Seismic Retrofitting of Corroded Reinforced Concrete Columns Using Ultra-High-Performance Concrete Jacketing</atitle><jtitle>ACI structural journal</jtitle><date>2024-07-01</date><risdate>2024</risdate><volume>121</volume><issue>4</issue><spage>87</spage><epage>99</epage><pages>87-99</pages><issn>0889-3241</issn><eissn>0889-3241</eissn><eissn>1944-7361</eissn><abstract>This paper investigates the efficacy of ultra-high-performance concrete (UHPC) jacketing as an option for seismic retrofit (repair or strengthening) of structural components that have been damaged by reinforcement corrosion. Previous work has illustrated that UHPC cover fully mitigates corrosion in the absence of service cracks and significantly reduces the corrosion rate in the case of preexisting cracks. In the present experimental study, cover replacement by UHPC is used to repair and strengthen corroded columns. Six lap-spliced columns designed based on pre-1970s design standards were constructed and subjected to artificial corrosion. Parameters of the investigation were: a) the aspect ratio of the specimens; b) the bar size (to account for the effect of bar diameter loss on bond); and c) the condition of the specimen (repair or strengthening after damage due to application of simulated seismic load to assess the effectiveness of retrofitting corroded components, even after having endured earthquake damage). The results show that thin UHPC jackets replacing conventional concrete cover suffice to impart a significant increase in strength and ductility of the columns. The jackets also endow the corroded and unconfined lap splices with significant force and deformation development capacity, thus alleviating a source of excessive column flexibility in existing construction.</abstract><cop>Farmington Hills</cop><pub>American Concrete Institute</pub><doi>10.14359/51740572</doi><tpages>13</tpages></addata></record> |
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| subjects | Aspect ratio Concrete Concrete columns Corrosion Corrosion effects Corrosion rate Corrosion tests Cracks Damage assessment Deformation effects Design Design parameters Design standards Ductility Ductility tests Earthquake construction Earthquake damage Earthquake loads Earthquakes Effectiveness Performance evaluation Polyvinyl alcohol Reinforced concrete Retrofitting Seismic activity Seismic engineering Seismic response Strengthening Stress corrosion cracking Ultra high performance concrete |
| title | Seismic Retrofitting of Corroded Reinforced Concrete Columns Using Ultra-High-Performance Concrete Jacketing |
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