Interfacial bond characteristics of steel fibers embedded in cementitious composites at high rates
In this study, the source of the rate-sensitive steel fiber pullout response in cement-based matrices was investigated at pullout rates of 0.0167–500 mm/s. A new pullout impact machine utilizing elastic strain energy to generate high-rate pullout loads was used in high-rate fiber pullout tests. In u...
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| Veröffentlicht in: | Cement and concrete research 2019-09, Vol.123, p.105802, Article 105802 |
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| creator | Park, Jun Kil Ngo, Tri Thuong Kim, Dong Joo |
| description | In this study, the source of the rate-sensitive steel fiber pullout response in cement-based matrices was investigated at pullout rates of 0.0167–500 mm/s. A new pullout impact machine utilizing elastic strain energy to generate high-rate pullout loads was used in high-rate fiber pullout tests. In ultra-high-performance concrete (UHPC), smooth (S) steel fibers generated a higher peak bond strength dynamic increase factor (DIF, 1.9) than hooked steel fibers (DIF, 1.25), whereas S fibers in high-strength mortar (96 MPa) did not exhibit noticeable rate sensitivity. Furthermore, the addition of a shrinkage-reducing agent to UHPC clearly decreased the rate sensitivity of S fibers owing to the reduced matrix shrinkage: the peak bond strength DIF decreased from 1.9 to 1.77. The theoretical analysis revealed that the fiber pullout rate sensitivity was correlated with the interfacial crack path in a manner that depended on the fiber geometry as well as the matrix composition. |
| doi_str_mv | 10.1016/j.cemconres.2019.105802 |
| format | Article |
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A new pullout impact machine utilizing elastic strain energy to generate high-rate pullout loads was used in high-rate fiber pullout tests. In ultra-high-performance concrete (UHPC), smooth (S) steel fibers generated a higher peak bond strength dynamic increase factor (DIF, 1.9) than hooked steel fibers (DIF, 1.25), whereas S fibers in high-strength mortar (96 MPa) did not exhibit noticeable rate sensitivity. Furthermore, the addition of a shrinkage-reducing agent to UHPC clearly decreased the rate sensitivity of S fibers owing to the reduced matrix shrinkage: the peak bond strength DIF decreased from 1.9 to 1.77. The theoretical analysis revealed that the fiber pullout rate sensitivity was correlated with the interfacial crack path in a manner that depended on the fiber geometry as well as the matrix composition.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><identifier>DOI: 10.1016/j.cemconres.2019.105802</identifier><language>eng</language><publisher>Elmsford: Elsevier Ltd</publisher><subject>Bond strength ; Bond strength (C) ; Bonding strength ; Fiber pullout ; Fiber reinforcement (E) ; Interfacial cracks ; Microcracking (B) ; Mortars (material) ; Pull out tests ; Pullout strength (C) ; Rate effect ; Reagents ; Reducing agents ; Sensitivity analysis ; Shrinkage ; Steel fibers ; Strain</subject><ispartof>Cement and concrete research, 2019-09, Vol.123, p.105802, Article 105802</ispartof><rights>2019 Elsevier Ltd</rights><rights>Copyright Elsevier BV Sep 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-76459c2e1532f4421dbf478dc07e77d81153299a7da847601b79845cf56bcf0b3</citedby><cites>FETCH-LOGICAL-c343t-76459c2e1532f4421dbf478dc07e77d81153299a7da847601b79845cf56bcf0b3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.cemconres.2019.105802$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Park, Jun Kil</creatorcontrib><creatorcontrib>Ngo, Tri Thuong</creatorcontrib><creatorcontrib>Kim, Dong Joo</creatorcontrib><title>Interfacial bond characteristics of steel fibers embedded in cementitious composites at high rates</title><title>Cement and concrete research</title><description>In this study, the source of the rate-sensitive steel fiber pullout response in cement-based matrices was investigated at pullout rates of 0.0167–500 mm/s. A new pullout impact machine utilizing elastic strain energy to generate high-rate pullout loads was used in high-rate fiber pullout tests. In ultra-high-performance concrete (UHPC), smooth (S) steel fibers generated a higher peak bond strength dynamic increase factor (DIF, 1.9) than hooked steel fibers (DIF, 1.25), whereas S fibers in high-strength mortar (96 MPa) did not exhibit noticeable rate sensitivity. Furthermore, the addition of a shrinkage-reducing agent to UHPC clearly decreased the rate sensitivity of S fibers owing to the reduced matrix shrinkage: the peak bond strength DIF decreased from 1.9 to 1.77. The theoretical analysis revealed that the fiber pullout rate sensitivity was correlated with the interfacial crack path in a manner that depended on the fiber geometry as well as the matrix composition.</description><subject>Bond strength</subject><subject>Bond strength (C)</subject><subject>Bonding strength</subject><subject>Fiber pullout</subject><subject>Fiber reinforcement (E)</subject><subject>Interfacial cracks</subject><subject>Microcracking (B)</subject><subject>Mortars (material)</subject><subject>Pull out tests</subject><subject>Pullout strength (C)</subject><subject>Rate effect</subject><subject>Reagents</subject><subject>Reducing agents</subject><subject>Sensitivity analysis</subject><subject>Shrinkage</subject><subject>Steel fibers</subject><subject>Strain</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFUMtKAzEUDaJgrX6DAddTk5nMJLMsxRcU3Og65HFjM3QmNUkF_96UEbeuLufe8-AehG4pWVFCu_thZWA0YYqQVjWhfdm2gtRnaEEFb6qmZ-IcLQghohKCdZfoKqWhwK5uxALplylDdMp4tcc6TBabnYrKlKVP2ZuEg8MpA-yx8xpiwjBqsBYs9hMuyTBln304JmzCeAjJZ0hYZbzzHzscVUHX6MKpfYKb37lE748Pb5vnavv69LJZbyvTsCZXvGNtb2qgbVM7xmpqtWNcWEM4cG4FPR36XnGrBOMdoZr3grXGtZ02juhmie5m30MMn0dIWQ7hGKcSKesiLJZt0xYWn1kmhpQiOHmIflTxW1IiT4XKQf4VKk-FyrnQolzPSihPfHmIMhkPkwHrI5gsbfD_evwAw1iDxw</recordid><startdate>201909</startdate><enddate>201909</enddate><creator>Park, Jun Kil</creator><creator>Ngo, Tri Thuong</creator><creator>Kim, Dong Joo</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>201909</creationdate><title>Interfacial bond characteristics of steel fibers embedded in cementitious composites at high rates</title><author>Park, Jun Kil ; Ngo, Tri Thuong ; Kim, Dong Joo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c343t-76459c2e1532f4421dbf478dc07e77d81153299a7da847601b79845cf56bcf0b3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Bond strength</topic><topic>Bond strength (C)</topic><topic>Bonding strength</topic><topic>Fiber pullout</topic><topic>Fiber reinforcement (E)</topic><topic>Interfacial cracks</topic><topic>Microcracking (B)</topic><topic>Mortars (material)</topic><topic>Pull out tests</topic><topic>Pullout strength (C)</topic><topic>Rate effect</topic><topic>Reagents</topic><topic>Reducing agents</topic><topic>Sensitivity analysis</topic><topic>Shrinkage</topic><topic>Steel fibers</topic><topic>Strain</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Park, Jun Kil</creatorcontrib><creatorcontrib>Ngo, Tri Thuong</creatorcontrib><creatorcontrib>Kim, Dong Joo</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Cement and concrete research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Park, Jun Kil</au><au>Ngo, Tri Thuong</au><au>Kim, Dong Joo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Interfacial bond characteristics of steel fibers embedded in cementitious composites at high rates</atitle><jtitle>Cement and concrete research</jtitle><date>2019-09</date><risdate>2019</risdate><volume>123</volume><spage>105802</spage><pages>105802-</pages><artnum>105802</artnum><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>In this study, the source of the rate-sensitive steel fiber pullout response in cement-based matrices was investigated at pullout rates of 0.0167–500 mm/s. A new pullout impact machine utilizing elastic strain energy to generate high-rate pullout loads was used in high-rate fiber pullout tests. In ultra-high-performance concrete (UHPC), smooth (S) steel fibers generated a higher peak bond strength dynamic increase factor (DIF, 1.9) than hooked steel fibers (DIF, 1.25), whereas S fibers in high-strength mortar (96 MPa) did not exhibit noticeable rate sensitivity. Furthermore, the addition of a shrinkage-reducing agent to UHPC clearly decreased the rate sensitivity of S fibers owing to the reduced matrix shrinkage: the peak bond strength DIF decreased from 1.9 to 1.77. The theoretical analysis revealed that the fiber pullout rate sensitivity was correlated with the interfacial crack path in a manner that depended on the fiber geometry as well as the matrix composition.</abstract><cop>Elmsford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.cemconres.2019.105802</doi></addata></record> |
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| subjects | Bond strength Bond strength (C) Bonding strength Fiber pullout Fiber reinforcement (E) Interfacial cracks Microcracking (B) Mortars (material) Pull out tests Pullout strength (C) Rate effect Reagents Reducing agents Sensitivity analysis Shrinkage Steel fibers Strain |
| title | Interfacial bond characteristics of steel fibers embedded in cementitious composites at high rates |
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