Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS
Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017nm−1–30nm−1 with a fractal disc-shaped particle analysis and Guinier approximat...
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| Veröffentlicht in: | Cement and concrete research 2017-01, Vol.91, p.24-32 |
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| creator | Maruyama, Ippei Sakamoto, Naoki Matsui, Kunio Igarashi, Go |
| description | Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017nm−1–30nm−1 with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~2.5nm) and of relatively large width (~35nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~10nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2nm−1–8nm−1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH. |
| doi_str_mv | 10.1016/j.cemconres.2016.10.002 |
| format | Article |
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The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~2.5nm) and of relatively large width (~35nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~10nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2nm−1–8nm−1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. 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The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~2.5nm) and of relatively large width (~35nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~10nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2nm−1–8nm−1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.</description><subject>Adsorption (C)</subject><subject>Agglomeration</subject><subject>Approximation</subject><subject>Calcium silicate hydrate</subject><subject>Calcium silicates</subject><subject>Calcium–silicate–hydrate (C–S–H) (B)</subject><subject>Cement</subject><subject>Cements</subject><subject>Desorption</subject><subject>Drying (A)</subject><subject>Hardening rate</subject><subject>Mathematical analysis</subject><subject>Microstructure (B)</subject><subject>Monolayers</subject><subject>Scattering</subject><subject>Small angle X ray scattering</subject><subject>Small-angle X-ray scattering (B)</subject><subject>Water vapor</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNqFkE1PGzEQhq0KpIbQ31BLvXZTf63XOUaIj0pBRQqI3iyvPUscBW-wvSn593gbxJWLx_N65p3xg9B3SmaUUPlrM7PwbPsQIc1YEYo6I4R9QROqGl7xuVAnaEIIUZVSQn5FZyltSioZVxP0eutt7FOOg81DNFts1yY8QcI-4H9rnwHf9TFvTXC4jIGQ8c6kog7BQcR5DbjzMWXs4sGHJ7yLvYWUMOzNdjAZHG4P-HHxd_UTr_6fo9HDeD1Hp53ZJvj2Hqfo4ery_uKmWv65_n2xWFZW1DxXXIAjXDW0AW6JFK2gykpirHBtS4l0TLW0lh2rrWA1q4VQc-s6qYA1ICjnU_Tj6FtWexkgZb3phxjKSE3nVHLJSE1LVXOsGmGkCJ3eRf9s4kFTokfMeqM_MOsR8_hQMJfOxbETyif2HqJO1kOw4HwEm7Xr_acebzOqiio</recordid><startdate>201701</startdate><enddate>201701</enddate><creator>Maruyama, Ippei</creator><creator>Sakamoto, Naoki</creator><creator>Matsui, Kunio</creator><creator>Igarashi, Go</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><orcidid>https://orcid.org/0000-0001-7521-3586</orcidid></search><sort><creationdate>201701</creationdate><title>Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS</title><author>Maruyama, Ippei ; Sakamoto, Naoki ; Matsui, Kunio ; Igarashi, Go</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c453t-34ed038717e3c064b418c60ac4dbb106d28b156f25c425254489cdf68e27e4133</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Adsorption (C)</topic><topic>Agglomeration</topic><topic>Approximation</topic><topic>Calcium silicate hydrate</topic><topic>Calcium silicates</topic><topic>Calcium–silicate–hydrate (C–S–H) (B)</topic><topic>Cement</topic><topic>Cements</topic><topic>Desorption</topic><topic>Drying (A)</topic><topic>Hardening rate</topic><topic>Mathematical analysis</topic><topic>Microstructure (B)</topic><topic>Monolayers</topic><topic>Scattering</topic><topic>Small angle X ray scattering</topic><topic>Small-angle X-ray scattering (B)</topic><topic>Water vapor</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Maruyama, Ippei</creatorcontrib><creatorcontrib>Sakamoto, Naoki</creatorcontrib><creatorcontrib>Matsui, Kunio</creatorcontrib><creatorcontrib>Igarashi, Go</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>Maruyama, Ippei</au><au>Sakamoto, Naoki</au><au>Matsui, Kunio</au><au>Igarashi, Go</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS</atitle><jtitle>Cement and concrete research</jtitle><date>2017-01</date><risdate>2017</risdate><volume>91</volume><spage>24</spage><epage>32</epage><pages>24-32</pages><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>Meso- and micro-scale structural changes in matured hardened cement paste dried slowly for 1.5years at different relative humidities (RHs) are evaluated by small-angle X-ray scattering profiles covering a q range of 0.017nm−1–30nm−1 with a fractal disc-shaped particle analysis and Guinier approximation. The fractal disc-shaped particle analysis revealed that calcium–silicate–hydrate (C–S–H) agglomerations are very thin (~2.5nm) and of relatively large width (~35nm) under high RH conditions. However, the agglomerations are segmented (in width) into ~10nm below an RH of 40%. The Guinier approximation found the possibility that the scattering profiles in the range of 2nm−1–8nm−1 correspond to a spacing between C–S–H monolayers and it showed stepwise changes at 40%–50% RH. The stepwise behavior of the distance between C–S–H monolayers may explain a kink in water vapor desorption at around 40% RH.</abstract><cop>Elmsford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.cemconres.2016.10.002</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0001-7521-3586</orcidid><oa>free_for_read</oa></addata></record> |
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| ispartof | Cement and concrete research, 2017-01, Vol.91, p.24-32 |
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| subjects | Adsorption (C) Agglomeration Approximation Calcium silicate hydrate Calcium silicates Calcium–silicate–hydrate (C–S–H) (B) Cement Cements Desorption Drying (A) Hardening rate Mathematical analysis Microstructure (B) Monolayers Scattering Small angle X ray scattering Small-angle X-ray scattering (B) Water vapor |
| title | Microstructural changes in white Portland cement paste under the first drying process evaluated by WAXS, SAXS, and USAXS |
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