Mapping high pH levels in hydrated calcium silicates
Data on the variability of pH levels in cement-based materials is essential for a better understanding of the early aging of materials and the long-term performance of concrete structures. Current approaches for measuring pH levels in concrete are inadequate with respect to radiometric range and res...
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| Veröffentlicht in: | Cement and concrete research 2017-05, Vol.95, p.232-239 |
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| container_title | Cement and concrete research |
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| creator | Liu, Engui Ghandehari, Masoud Brückner, Christian Khalil, Gamal Worlinsky, Jill Jin, Weihua Sidelev, Alexey Hyland, Michael A. |
| description | Data on the variability of pH levels in cement-based materials is essential for a better understanding of the early aging of materials and the long-term performance of concrete structures. Current approaches for measuring pH levels in concrete are inadequate with respect to radiometric range and resolution and spatial granularity. We report on a methodology for mapping pH levels in concrete utilizing a halochromic porphyrin sensor molecule that allows a simple measurement of surface values of pH level using a commercial digital camera setup. As proof of concept, cement paste, mortar, and concrete samples were subject to accelerated carbonation and then evaluated for pH profiles at different ages of degradation. Comparative tests on the same specimens were also conducted using phenolphthalein as the pH indicator. Spatial distribution of pH level from pH11.0 to 13.5 was mapped at various levels of carbonation. |
| doi_str_mv | 10.1016/j.cemconres.2017.02.001 |
| format | Article |
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Current approaches for measuring pH levels in concrete are inadequate with respect to radiometric range and resolution and spatial granularity. We report on a methodology for mapping pH levels in concrete utilizing a halochromic porphyrin sensor molecule that allows a simple measurement of surface values of pH level using a commercial digital camera setup. As proof of concept, cement paste, mortar, and concrete samples were subject to accelerated carbonation and then evaluated for pH profiles at different ages of degradation. Comparative tests on the same specimens were also conducted using phenolphthalein as the pH indicator. Spatial distribution of pH level from pH11.0 to 13.5 was mapped at various levels of carbonation.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><identifier>DOI: 10.1016/j.cemconres.2017.02.001</identifier><language>eng</language><publisher>Elmsford: Elsevier Ltd</publisher><subject>Age ; Aging (materials) ; Calcium silicate hydrate ; CALCIUM SILICATES ; CARBONATES ; Carbonation ; Cement ; Cements ; Concrete ; Concrete structures ; CONCRETES ; CORROSION ; Digital cameras ; Durability ; Halochromism ; HARDNESS ; MAPPING ; MATERIALS SCIENCE ; PH VALUE ; Phenolphthalein ; Pore solution ; Reinforcement corrosion ; Silicates ; SPATIAL DISTRIBUTION</subject><ispartof>Cement and concrete research, 2017-05, Vol.95, p.232-239</ispartof><rights>2017</rights><rights>Copyright Elsevier BV May 2017</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c420t-b80aa63f06a64c2a2e256592c14749715db9146b983e27c7961bd9351e96cdcc3</citedby><cites>FETCH-LOGICAL-c420t-b80aa63f06a64c2a2e256592c14749715db9146b983e27c7961bd9351e96cdcc3</cites><orcidid>0000-0002-1560-7345</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0008884616301843$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/22697109$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>Liu, Engui</creatorcontrib><creatorcontrib>Ghandehari, Masoud</creatorcontrib><creatorcontrib>Brückner, Christian</creatorcontrib><creatorcontrib>Khalil, Gamal</creatorcontrib><creatorcontrib>Worlinsky, Jill</creatorcontrib><creatorcontrib>Jin, Weihua</creatorcontrib><creatorcontrib>Sidelev, Alexey</creatorcontrib><creatorcontrib>Hyland, Michael A.</creatorcontrib><title>Mapping high pH levels in hydrated calcium silicates</title><title>Cement and concrete research</title><description>Data on the variability of pH levels in cement-based materials is essential for a better understanding of the early aging of materials and the long-term performance of concrete structures. Current approaches for measuring pH levels in concrete are inadequate with respect to radiometric range and resolution and spatial granularity. We report on a methodology for mapping pH levels in concrete utilizing a halochromic porphyrin sensor molecule that allows a simple measurement of surface values of pH level using a commercial digital camera setup. As proof of concept, cement paste, mortar, and concrete samples were subject to accelerated carbonation and then evaluated for pH profiles at different ages of degradation. Comparative tests on the same specimens were also conducted using phenolphthalein as the pH indicator. Spatial distribution of pH level from pH11.0 to 13.5 was mapped at various levels of carbonation.</description><subject>Age</subject><subject>Aging (materials)</subject><subject>Calcium silicate hydrate</subject><subject>CALCIUM SILICATES</subject><subject>CARBONATES</subject><subject>Carbonation</subject><subject>Cement</subject><subject>Cements</subject><subject>Concrete</subject><subject>Concrete structures</subject><subject>CONCRETES</subject><subject>CORROSION</subject><subject>Digital cameras</subject><subject>Durability</subject><subject>Halochromism</subject><subject>HARDNESS</subject><subject>MAPPING</subject><subject>MATERIALS SCIENCE</subject><subject>PH VALUE</subject><subject>Phenolphthalein</subject><subject>Pore solution</subject><subject>Reinforcement corrosion</subject><subject>Silicates</subject><subject>SPATIAL DISTRIBUTION</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqFkE9PwzAMxSMEEmPwGajEuSVJ2_w5ThMwpCEucI5S11szdW1Jukn79qQagiMny9bz8_OPkHtGM0aZeNxlgHvoO48h45TJjPKMUnZBZkzJPM11oS7JjFKqUqUKcU1uQtjFVvBczUjxZofBddukcdsmGVZJi0dsQ-K6pDnV3o5YJ2BbcId9ElzrIE7CLbna2Dbg3U-dk8_np4_lKl2_v7wuF-sUCk7HtFLUWpFvqLCiAG458lKUmgMrZKElK-tKs0JUWuXIJUgtWFXrvGSoBdQA-Zw8nH37MDoTwI0ITXy1QxgN5yJ6UP2nGnz_dcAwml1_8F0MZphmUpTxKo0qeVaB70PwuDGDd3vrT4ZRM4E0O_ML0kwgDeUmgoybi_Nm5IJHh35Kgh1g7fwUpO7dvx7frOZ-BQ</recordid><startdate>20170501</startdate><enddate>20170501</enddate><creator>Liu, Engui</creator><creator>Ghandehari, Masoud</creator><creator>Brückner, Christian</creator><creator>Khalil, Gamal</creator><creator>Worlinsky, Jill</creator><creator>Jin, Weihua</creator><creator>Sidelev, Alexey</creator><creator>Hyland, Michael A.</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><scope>OTOTI</scope><orcidid>https://orcid.org/0000-0002-1560-7345</orcidid></search><sort><creationdate>20170501</creationdate><title>Mapping high pH levels in hydrated calcium silicates</title><author>Liu, Engui ; 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| ispartof | Cement and concrete research, 2017-05, Vol.95, p.232-239 |
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| source | Elsevier ScienceDirect Journals |
| subjects | Age Aging (materials) Calcium silicate hydrate CALCIUM SILICATES CARBONATES Carbonation Cement Cements Concrete Concrete structures CONCRETES CORROSION Digital cameras Durability Halochromism HARDNESS MAPPING MATERIALS SCIENCE PH VALUE Phenolphthalein Pore solution Reinforcement corrosion Silicates SPATIAL DISTRIBUTION |
| title | Mapping high pH levels in hydrated calcium silicates |
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