Mechanisms dominating thixotropy in limestone calcined clay cement (LC3)
Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to domina...
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| Veröffentlicht in: | Cement and concrete research 2021-02, Vol.140, p.106316, Article 106316 |
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| container_title | Cement and concrete research |
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| creator | Hou, Pengkun Muzenda, Tafadzwa Ronald Li, Qinfei Chen, Heng Kawashima, Shiho Sui, Tongbo Yong, Haiyan Xie, Ning Cheng, Xin |
| description | Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, 1H nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time. |
| doi_str_mv | 10.1016/j.cemconres.2020.106316 |
| format | Article |
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Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, 1H nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time.</description><identifier>ISSN: 0008-8846</identifier><identifier>EISSN: 1873-3948</identifier><identifier>DOI: 10.1016/j.cemconres.2020.106316</identifier><language>eng</language><publisher>Elmsford: Elsevier Ltd</publisher><subject>1H NMR ; Cement ; Clay ; Clinker ; Computed tomography ; Dilution ; Flocculation ; Ion beams ; LC3 ; Limestone ; NMR ; Nuclear magnetic resonance ; Portland cements ; Roasting ; Surface charge ; Thixotropy ; Water distribution ; Workability ; Zeta potential</subject><ispartof>Cement and concrete research, 2021-02, Vol.140, p.106316, Article 106316</ispartof><rights>2020 Elsevier Ltd</rights><rights>Copyright Elsevier BV Feb 2021</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c343t-93408a95bcdf6bd0a2a5ec6ddb172e2f17752312f016c09ac6f6eb0e571e64a23</citedby><cites>FETCH-LOGICAL-c343t-93408a95bcdf6bd0a2a5ec6ddb172e2f17752312f016c09ac6f6eb0e571e64a23</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.2020.106316$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Hou, Pengkun</creatorcontrib><creatorcontrib>Muzenda, Tafadzwa Ronald</creatorcontrib><creatorcontrib>Li, Qinfei</creatorcontrib><creatorcontrib>Chen, Heng</creatorcontrib><creatorcontrib>Kawashima, Shiho</creatorcontrib><creatorcontrib>Sui, Tongbo</creatorcontrib><creatorcontrib>Yong, Haiyan</creatorcontrib><creatorcontrib>Xie, Ning</creatorcontrib><creatorcontrib>Cheng, Xin</creatorcontrib><title>Mechanisms dominating thixotropy in limestone calcined clay cement (LC3)</title><title>Cement and concrete research</title><description>Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, 1H nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time.</description><subject>1H NMR</subject><subject>Cement</subject><subject>Clay</subject><subject>Clinker</subject><subject>Computed tomography</subject><subject>Dilution</subject><subject>Flocculation</subject><subject>Ion beams</subject><subject>LC3</subject><subject>Limestone</subject><subject>NMR</subject><subject>Nuclear magnetic resonance</subject><subject>Portland cements</subject><subject>Roasting</subject><subject>Surface charge</subject><subject>Thixotropy</subject><subject>Water distribution</subject><subject>Workability</subject><subject>Zeta potential</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNqFUMtOwzAQtBBIlMI3YIkLHFL8SOzkWFVAkYq4wNlynA11lNjFThH9e1wFceW02tU8dgaha0oWlFBx3y0MDMa7AHHBCDteBafiBM1oKXnGq7w8RTNCSJmVZS7O0UWMXVoF4-UMrV_AbLWzcYi48YN1erTuA49b--3H4HcHbB3u7QBx9A6w0b2xDhpsen3AyRjciG83K353ic5a3Ue4-p1z9P748LZaZ5vXp-fVcpMZnvMxq3hOSl0VtWlaUTdEM12AEU1TU8mAtVTKgnHK2hTNkEob0QqoCRSSgsg143N0M-nugv_cp7dU5_fBJUvF8rKSQuaMJ5ScUCb4GAO0ahfsoMNBUaKOtalO_dWmjrWpqbbEXE5MSCG-LAQVjQVnoLEBzKgab__V-AG2VHoh</recordid><startdate>202102</startdate><enddate>202102</enddate><creator>Hou, Pengkun</creator><creator>Muzenda, Tafadzwa Ronald</creator><creator>Li, Qinfei</creator><creator>Chen, Heng</creator><creator>Kawashima, Shiho</creator><creator>Sui, Tongbo</creator><creator>Yong, Haiyan</creator><creator>Xie, Ning</creator><creator>Cheng, Xin</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>202102</creationdate><title>Mechanisms dominating thixotropy in limestone calcined clay cement (LC3)</title><author>Hou, Pengkun ; Muzenda, Tafadzwa Ronald ; Li, Qinfei ; Chen, Heng ; Kawashima, Shiho ; Sui, Tongbo ; Yong, Haiyan ; Xie, Ning ; Cheng, Xin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c343t-93408a95bcdf6bd0a2a5ec6ddb172e2f17752312f016c09ac6f6eb0e571e64a23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>1H NMR</topic><topic>Cement</topic><topic>Clay</topic><topic>Clinker</topic><topic>Computed tomography</topic><topic>Dilution</topic><topic>Flocculation</topic><topic>Ion beams</topic><topic>LC3</topic><topic>Limestone</topic><topic>NMR</topic><topic>Nuclear magnetic resonance</topic><topic>Portland cements</topic><topic>Roasting</topic><topic>Surface charge</topic><topic>Thixotropy</topic><topic>Water distribution</topic><topic>Workability</topic><topic>Zeta potential</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hou, Pengkun</creatorcontrib><creatorcontrib>Muzenda, Tafadzwa Ronald</creatorcontrib><creatorcontrib>Li, Qinfei</creatorcontrib><creatorcontrib>Chen, Heng</creatorcontrib><creatorcontrib>Kawashima, Shiho</creatorcontrib><creatorcontrib>Sui, Tongbo</creatorcontrib><creatorcontrib>Yong, Haiyan</creatorcontrib><creatorcontrib>Xie, Ning</creatorcontrib><creatorcontrib>Cheng, Xin</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>Hou, Pengkun</au><au>Muzenda, Tafadzwa Ronald</au><au>Li, Qinfei</au><au>Chen, Heng</au><au>Kawashima, Shiho</au><au>Sui, Tongbo</au><au>Yong, Haiyan</au><au>Xie, Ning</au><au>Cheng, Xin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Mechanisms dominating thixotropy in limestone calcined clay cement (LC3)</atitle><jtitle>Cement and concrete research</jtitle><date>2021-02</date><risdate>2021</risdate><volume>140</volume><spage>106316</spage><pages>106316-</pages><artnum>106316</artnum><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>Limestone calcined clay cement (LC3) is a green binder with great practical importance for the cement industry. Growing application has increased the need to understand the mechanisms governing its thixotropy for better control of workability. While formation of C-S-H bridges is understood to dominate the thixotropy of ordinary Portland cement, LC3 paste displayed unique thixotropy properties. In this study, focused beam reflectance measurement, zeta potential, 1H nuclear magnetic resonance relaxometry and micro X-ray computed tomography were used to track the colloidal interaction and hydration extent within LC3 paste. Results showed that flocculation due to the negative surface charge and water affinity of calcined clay appears to be the dominating factor. This leads to a reduction of water available to contribute to fluidity of the paste and, in turn, governing the development of thixotropy over time. In addition, the dilution effect due to high clinker substitution diminishes thixotropy growth with time.</abstract><cop>Elmsford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.cemconres.2020.106316</doi></addata></record> |
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| subjects | 1H NMR Cement Clay Clinker Computed tomography Dilution Flocculation Ion beams LC3 Limestone NMR Nuclear magnetic resonance Portland cements Roasting Surface charge Thixotropy Water distribution Workability Zeta potential |
| title | Mechanisms dominating thixotropy in limestone calcined clay cement (LC3) |
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