A prediction study of hydroxyapatite entrapment ability in concrete
The entrapment ability of phosphates containing OH −, such as hydroxyapatite (HAP) (Ca 5(PO 4) 3(OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44 ppm after 28 days immersion in a 0...
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| Veröffentlicht in: | Construction & building materials 2010-12, Vol.24 (12), p.2646-2649 |
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| creator | Bastidas, D.M. La Iglesia, V.M. Criado, M. Fajardo, S. La Iglesia, A. Bastidas, J.M. |
| description | The entrapment ability of phosphates containing OH
−, such as hydroxyapatite (HAP) (Ca
5(PO
4)
3(OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44
ppm after 28
days immersion in a 0.5
M sodium chloride (NaCl) solution at pH 9. A thermodynamic study was performed on the chemical equilibrium of HAP, whitlockite (Ca
3(PO
4)
2), and hilgenstockite (Ca
4O(PO
4)
2), indicating that the contribution of
PO
4
3
-
ion activity to the concrete is very low to justify the crystallization of chlorapatite (Ca
5(PO
4)
3Cl). In contrast, the precipitation of a solid phase such as FePO
4·2H
2O to act as a physical barrier inhibiting steel corrosion is thermodynamically favoured, which means that HAP and other phosphates may be used as a corrosion inhibitors. |
| doi_str_mv | 10.1016/j.conbuildmat.2010.04.060 |
| format | Article |
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−, such as hydroxyapatite (HAP) (Ca
5(PO
4)
3(OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44
ppm after 28
days immersion in a 0.5
M sodium chloride (NaCl) solution at pH 9. A thermodynamic study was performed on the chemical equilibrium of HAP, whitlockite (Ca
3(PO
4)
2), and hilgenstockite (Ca
4O(PO
4)
2), indicating that the contribution of
PO
4
3
-
ion activity to the concrete is very low to justify the crystallization of chlorapatite (Ca
5(PO
4)
3Cl). In contrast, the precipitation of a solid phase such as FePO
4·2H
2O to act as a physical barrier inhibiting steel corrosion is thermodynamically favoured, which means that HAP and other phosphates may be used as a corrosion inhibitors.</description><identifier>ISSN: 0950-0618</identifier><identifier>EISSN: 1879-0526</identifier><identifier>DOI: 10.1016/j.conbuildmat.2010.04.060</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Chlorapatite ; Chlorides ; Concrete ; Concretes ; Construction materials ; Corrosion inhibitors ; Entrapment ; Hydroxyapatite ; Phosphates ; Thermodynamic stability</subject><ispartof>Construction & building materials, 2010-12, Vol.24 (12), p.2646-2649</ispartof><rights>2010 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c386t-cdfd37ed4506f4652b27859e40c11b395d3d314ca2c3afb39e6c276fd9ff9d9d3</citedby><cites>FETCH-LOGICAL-c386t-cdfd37ed4506f4652b27859e40c11b395d3d314ca2c3afb39e6c276fd9ff9d9d3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.conbuildmat.2010.04.060$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Bastidas, D.M.</creatorcontrib><creatorcontrib>La Iglesia, V.M.</creatorcontrib><creatorcontrib>Criado, M.</creatorcontrib><creatorcontrib>Fajardo, S.</creatorcontrib><creatorcontrib>La Iglesia, A.</creatorcontrib><creatorcontrib>Bastidas, J.M.</creatorcontrib><title>A prediction study of hydroxyapatite entrapment ability in concrete</title><title>Construction & building materials</title><description>The entrapment ability of phosphates containing OH
−, such as hydroxyapatite (HAP) (Ca
5(PO
4)
3(OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44
ppm after 28
days immersion in a 0.5
M sodium chloride (NaCl) solution at pH 9. A thermodynamic study was performed on the chemical equilibrium of HAP, whitlockite (Ca
3(PO
4)
2), and hilgenstockite (Ca
4O(PO
4)
2), indicating that the contribution of
PO
4
3
-
ion activity to the concrete is very low to justify the crystallization of chlorapatite (Ca
5(PO
4)
3Cl). In contrast, the precipitation of a solid phase such as FePO
4·2H
2O to act as a physical barrier inhibiting steel corrosion is thermodynamically favoured, which means that HAP and other phosphates may be used as a corrosion inhibitors.</description><subject>Chlorapatite</subject><subject>Chlorides</subject><subject>Concrete</subject><subject>Concretes</subject><subject>Construction materials</subject><subject>Corrosion inhibitors</subject><subject>Entrapment</subject><subject>Hydroxyapatite</subject><subject>Phosphates</subject><subject>Thermodynamic stability</subject><issn>0950-0618</issn><issn>1879-0526</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNqNkEtLxDAUhYMoOI7-h7rSTcebtE2b5TD4ggE3ug5pcoMZ-jLJiP33ZhgXrsTVgcM553I_Qq4prChQfrdb6XFo964zvYorBsmHcgUcTsiCNrXIoWL8lCxAVJADp805uQhhBwCccbYgm3U2eTRORzcOWYh7M2ejzd5n48evWU0quogZDtGrqU-SqdZ1Ls6ZG7J0WXuMeEnOrOoCXv3okrw93L9unvLty-PzZr3NddHwmGtjTVGjKSvgtuQVa1ndVAJL0JS2hahMYQpaasV0oWwykGtWc2uEtcIIUyzJzXF38uPHHkOUvQsau04NOO6DbArKgJdlk5K3fyZpnUDRSjRViopjVPsxBI9WTt71ys-Sgjwgljv5C7E8IJZQyoQ4dTfHLqavPx16GbTDQSeeHnWUZnT_WPkG1lyL1w</recordid><startdate>20101201</startdate><enddate>20101201</enddate><creator>Bastidas, D.M.</creator><creator>La Iglesia, V.M.</creator><creator>Criado, M.</creator><creator>Fajardo, S.</creator><creator>La Iglesia, A.</creator><creator>Bastidas, J.M.</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>7SE</scope><scope>7SR</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>KR7</scope></search><sort><creationdate>20101201</creationdate><title>A prediction study of hydroxyapatite entrapment ability in concrete</title><author>Bastidas, D.M. ; La Iglesia, V.M. ; Criado, M. ; Fajardo, S. ; La Iglesia, A. ; Bastidas, J.M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c386t-cdfd37ed4506f4652b27859e40c11b395d3d314ca2c3afb39e6c276fd9ff9d9d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Chlorapatite</topic><topic>Chlorides</topic><topic>Concrete</topic><topic>Concretes</topic><topic>Construction materials</topic><topic>Corrosion inhibitors</topic><topic>Entrapment</topic><topic>Hydroxyapatite</topic><topic>Phosphates</topic><topic>Thermodynamic stability</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bastidas, D.M.</creatorcontrib><creatorcontrib>La Iglesia, V.M.</creatorcontrib><creatorcontrib>Criado, M.</creatorcontrib><creatorcontrib>Fajardo, S.</creatorcontrib><creatorcontrib>La Iglesia, A.</creatorcontrib><creatorcontrib>Bastidas, J.M.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Corrosion Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Civil Engineering Abstracts</collection><jtitle>Construction & building materials</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bastidas, D.M.</au><au>La Iglesia, V.M.</au><au>Criado, M.</au><au>Fajardo, S.</au><au>La Iglesia, A.</au><au>Bastidas, J.M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A prediction study of hydroxyapatite entrapment ability in concrete</atitle><jtitle>Construction & building materials</jtitle><date>2010-12-01</date><risdate>2010</risdate><volume>24</volume><issue>12</issue><spage>2646</spage><epage>2649</epage><pages>2646-2649</pages><issn>0950-0618</issn><eissn>1879-0526</eissn><abstract>The entrapment ability of phosphates containing OH
−, such as hydroxyapatite (HAP) (Ca
5(PO
4)
3(OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44
ppm after 28
days immersion in a 0.5
M sodium chloride (NaCl) solution at pH 9. A thermodynamic study was performed on the chemical equilibrium of HAP, whitlockite (Ca
3(PO
4)
2), and hilgenstockite (Ca
4O(PO
4)
2), indicating that the contribution of
PO
4
3
-
ion activity to the concrete is very low to justify the crystallization of chlorapatite (Ca
5(PO
4)
3Cl). In contrast, the precipitation of a solid phase such as FePO
4·2H
2O to act as a physical barrier inhibiting steel corrosion is thermodynamically favoured, which means that HAP and other phosphates may be used as a corrosion inhibitors.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.conbuildmat.2010.04.060</doi><tpages>4</tpages></addata></record> |
| fulltext | fulltext |
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| ispartof | Construction & building materials, 2010-12, Vol.24 (12), p.2646-2649 |
| issn | 0950-0618 1879-0526 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_831206448 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Chlorapatite Chlorides Concrete Concretes Construction materials Corrosion inhibitors Entrapment Hydroxyapatite Phosphates Thermodynamic stability |
| title | A prediction study of hydroxyapatite entrapment ability in concrete |
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