Thermal properties of hydrated cement pastes studied by the photoacoustic technique
Photoacoustic (PA) technique has been applied to measure the effective thermal diffusivity (αeff) of hydrating cement pastes with a varying water to -cement ratio (w/c) and for variable duration (d) of hydration. Four samples with w/c 0.3, 0.4, 0.5 and o.6 were prepared. The frequency variation of t...
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| Veröffentlicht in: | Journal of physics. Conference series 2010-03, Vol.214 (1), p.012136 |
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| creator | Abdelalim, A Abdallah, S Easawi, K Negm, S Talaat, H |
| description | Photoacoustic (PA) technique has been applied to measure the effective thermal diffusivity (αeff) of hydrating cement pastes with a varying water to -cement ratio (w/c) and for variable duration (d) of hydration. Four samples with w/c 0.3, 0.4, 0.5 and o.6 were prepared. The frequency variation of the PA signal for each sample was recorded at the begining (0 d), as well as one week and one month of hydration. The effective thermal effusivity (eeff) was obtained by measuring the variation of the signal with modulation frequency and the corresponding values of the effective thermal conductivity (keff) were calculated. The results for keff show a decrease at higher w/c (0.6), no change for other samples has been observed. The thickness of the duplex film of Ca(OH)2 and C-S-H formed on the surface of the samples of w/c 0.5 were determined using the effective layer model in the 0 d and after one month of hydration; a remarkable increase was observed in the last case. |
| doi_str_mv | 10.1088/1742-6596/214/1/012136 |
| format | Article |
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Four samples with w/c 0.3, 0.4, 0.5 and o.6 were prepared. The frequency variation of the PA signal for each sample was recorded at the begining (0 d), as well as one week and one month of hydration. The effective thermal effusivity (eeff) was obtained by measuring the variation of the signal with modulation frequency and the corresponding values of the effective thermal conductivity (keff) were calculated. The results for keff show a decrease at higher w/c (0.6), no change for other samples has been observed. The thickness of the duplex film of Ca(OH)2 and C-S-H formed on the surface of the samples of w/c 0.5 were determined using the effective layer model in the 0 d and after one month of hydration; a remarkable increase was observed in the last case.</description><identifier>ISSN: 1742-6596</identifier><identifier>ISSN: 1742-6588</identifier><identifier>EISSN: 1742-6596</identifier><identifier>DOI: 10.1088/1742-6596/214/1/012136</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Cement paste ; Frequency variation ; Hydration ; Mathematical analysis ; Physics ; Slaked lime ; Thermal conductivity ; Thermal diffusivity ; Thermal effusivity ; Thermodynamic properties ; Thickness</subject><ispartof>Journal of physics. 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Conference series</title><description>Photoacoustic (PA) technique has been applied to measure the effective thermal diffusivity (αeff) of hydrating cement pastes with a varying water to -cement ratio (w/c) and for variable duration (d) of hydration. Four samples with w/c 0.3, 0.4, 0.5 and o.6 were prepared. The frequency variation of the PA signal for each sample was recorded at the begining (0 d), as well as one week and one month of hydration. The effective thermal effusivity (eeff) was obtained by measuring the variation of the signal with modulation frequency and the corresponding values of the effective thermal conductivity (keff) were calculated. The results for keff show a decrease at higher w/c (0.6), no change for other samples has been observed. The thickness of the duplex film of Ca(OH)2 and C-S-H formed on the surface of the samples of w/c 0.5 were determined using the effective layer model in the 0 d and after one month of hydration; a remarkable increase was observed in the last case.</description><subject>Cement paste</subject><subject>Frequency variation</subject><subject>Hydration</subject><subject>Mathematical analysis</subject><subject>Physics</subject><subject>Slaked lime</subject><subject>Thermal conductivity</subject><subject>Thermal diffusivity</subject><subject>Thermal effusivity</subject><subject>Thermodynamic properties</subject><subject>Thickness</subject><issn>1742-6596</issn><issn>1742-6588</issn><issn>1742-6596</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNqNkMtOAyEUhonRxFp9BUPiehxuQ2FpGm9JExfWNaFwJjNNW0ZgFn17acYYFy5kA-H83znwIXRLyT0lStV0IVglGy1rRkVNa0IZ5fIMzX4K57_Ol-gqpS0hvKzFDL2vO4h7u8NDDAPE3EPCocXd0UebwWMHezhkPNiUSyXl0ffldnPEuQM8dCEH68KYcu9wBtcd-s8RrtFFa3cJbr73Ofp4elwvX6rV2_Pr8mFVOUFprnwLyjKqwYIUoIlnunWOc2ZJKz2njRdObFhJad1oooQSG6FB-ca3nDngc3Q39S1vL2NTNtswxkMZaVizKBAnUpWUnFIuhpQitGaI_d7Go6HEnASakxtzcmOKQEPNJLCAdAL7MPyfqf5g_syaoXzjC7qzgPU</recordid><startdate>20100301</startdate><enddate>20100301</enddate><creator>Abdelalim, A</creator><creator>Abdallah, S</creator><creator>Easawi, K</creator><creator>Negm, S</creator><creator>Talaat, H</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>L7M</scope><scope>P5Z</scope><scope>P62</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20100301</creationdate><title>Thermal properties of hydrated cement pastes studied by the photoacoustic technique</title><author>Abdelalim, A ; Abdallah, S ; Easawi, K ; Negm, S ; Talaat, H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c411t-dfe8a219eae64e90d29fcc332a0f6d315d4c4b2fe8995908484b49e8d5df32ce3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Cement paste</topic><topic>Frequency variation</topic><topic>Hydration</topic><topic>Mathematical analysis</topic><topic>Physics</topic><topic>Slaked lime</topic><topic>Thermal conductivity</topic><topic>Thermal diffusivity</topic><topic>Thermal effusivity</topic><topic>Thermodynamic properties</topic><topic>Thickness</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Abdelalim, A</creatorcontrib><creatorcontrib>Abdallah, S</creatorcontrib><creatorcontrib>Easawi, K</creatorcontrib><creatorcontrib>Negm, S</creatorcontrib><creatorcontrib>Talaat, H</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ProQuest advanced technologies & aerospace journals</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Publicly Available Content (ProQuest)</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><jtitle>Journal of physics. Conference series</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Abdelalim, A</au><au>Abdallah, S</au><au>Easawi, K</au><au>Negm, S</au><au>Talaat, H</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Thermal properties of hydrated cement pastes studied by the photoacoustic technique</atitle><jtitle>Journal of physics. Conference series</jtitle><date>2010-03-01</date><risdate>2010</risdate><volume>214</volume><issue>1</issue><spage>012136</spage><pages>012136-</pages><issn>1742-6596</issn><issn>1742-6588</issn><eissn>1742-6596</eissn><abstract>Photoacoustic (PA) technique has been applied to measure the effective thermal diffusivity (αeff) of hydrating cement pastes with a varying water to -cement ratio (w/c) and for variable duration (d) of hydration. Four samples with w/c 0.3, 0.4, 0.5 and o.6 were prepared. The frequency variation of the PA signal for each sample was recorded at the begining (0 d), as well as one week and one month of hydration. The effective thermal effusivity (eeff) was obtained by measuring the variation of the signal with modulation frequency and the corresponding values of the effective thermal conductivity (keff) were calculated. The results for keff show a decrease at higher w/c (0.6), no change for other samples has been observed. The thickness of the duplex film of Ca(OH)2 and C-S-H formed on the surface of the samples of w/c 0.5 were determined using the effective layer model in the 0 d and after one month of hydration; a remarkable increase was observed in the last case.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1742-6596/214/1/012136</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Cement paste Frequency variation Hydration Mathematical analysis Physics Slaked lime Thermal conductivity Thermal diffusivity Thermal effusivity Thermodynamic properties Thickness |
| title | Thermal properties of hydrated cement pastes studied by the photoacoustic technique |
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