Further studies of the hydration of MgO-hydromagnesite blends
The hydration of magnesium oxide in the presence of hydromagnesite (Mg5(CO3)4(OH)2·4H2O) was investigated. The hydration products are a poorly-crystalline form of brucite (Mg(OH)2) and an unknown amorphous or poorly crystalline hydrate, which was evidenced by X-ray diffraction analyses and Raman spe...
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| Veröffentlicht in: | Cement and concrete research 2019-12, Vol.126, p.105912, Article 105912 |
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| creator | Winnefeld, Frank Epifania, Eugenia Montagnaro, Fabio Gartner, Ellis M. |
| description | The hydration of magnesium oxide in the presence of hydromagnesite (Mg5(CO3)4(OH)2·4H2O) was investigated. The hydration products are a poorly-crystalline form of brucite (Mg(OH)2) and an unknown amorphous or poorly crystalline hydrate, which was evidenced by X-ray diffraction analyses and Raman spectroscopy. By thermogravimetry it was found that in the presence of hydromagnesite more water is bound in hydrate phases than can be explained by the formation of brucite only. The unknown hydrate is hypothesized to lead to cohesive binding in MgO-hydromagnesite blends. Due to thermodynamic predictions artinite (Mg2(CO3)(OH)2·3H2O) should be the stable hydrate in this system. The addition of artinite crystal seeds, however, had no significant effect on hydration kinetics or nature of the reaction products. The hypothesis that the addition of sodium bicarbonate (NaHCO3) could modify or accelerate the hydration reactions due to its high solubility and the supply of additional HCO3− ions was also not supported by the experiments. |
| doi_str_mv | 10.1016/j.cemconres.2019.105912 |
| format | Article |
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The hydration products are a poorly-crystalline form of brucite (Mg(OH)2) and an unknown amorphous or poorly crystalline hydrate, which was evidenced by X-ray diffraction analyses and Raman spectroscopy. By thermogravimetry it was found that in the presence of hydromagnesite more water is bound in hydrate phases than can be explained by the formation of brucite only. The unknown hydrate is hypothesized to lead to cohesive binding in MgO-hydromagnesite blends. Due to thermodynamic predictions artinite (Mg2(CO3)(OH)2·3H2O) should be the stable hydrate in this system. The addition of artinite crystal seeds, however, had no significant effect on hydration kinetics or nature of the reaction products. 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The hydration products are a poorly-crystalline form of brucite (Mg(OH)2) and an unknown amorphous or poorly crystalline hydrate, which was evidenced by X-ray diffraction analyses and Raman spectroscopy. By thermogravimetry it was found that in the presence of hydromagnesite more water is bound in hydrate phases than can be explained by the formation of brucite only. The unknown hydrate is hypothesized to lead to cohesive binding in MgO-hydromagnesite blends. Due to thermodynamic predictions artinite (Mg2(CO3)(OH)2·3H2O) should be the stable hydrate in this system. The addition of artinite crystal seeds, however, had no significant effect on hydration kinetics or nature of the reaction products. The hypothesis that the addition of sodium bicarbonate (NaHCO3) could modify or accelerate the hydration reactions due to its high solubility and the supply of additional HCO3− ions was also not supported by the experiments.</description><subject>Artinite</subject><subject>Basic magnesium carbonate</subject><subject>Brucite</subject><subject>Cement</subject><subject>Crystal structure</subject><subject>Crystallinity</subject><subject>Dypingite</subject><subject>Hydration</subject><subject>Hydromagnesite</subject><subject>Magnesium hydroxide</subject><subject>Magnesium oxide</subject><subject>Mixtures</subject><subject>Raman spectroscopy</subject><subject>Reaction kinetics</subject><subject>Reaction products</subject><subject>Sodium bicarbonate</subject><subject>Superconductors (materials)</subject><subject>Thermogravimetry</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFkEtPwzAQhC0EEqXwG4jEOcWPxI8Dh6qigFTUC5ytxN60jtq42A5S_z2JgrhyWs1oZ1b7IXRP8IJgwh_bhYGj8V2AuKCYqMEtFaEXaEakYDlThbxEM4yxzKUs-DW6ibEdJKdMztDTug9pDyGLqbcOYuabbNDZ_mxDlZzvRuN9t81Hwx-rXQfRJcjqA3Q23qKrpjpEuPudc_S5fv5Yveab7cvbarnJDVM05QxDpagsJJUNrkpR8EIQ4CWri8ZAUVJRWSx5SXgtGl4KapVVwmBqac0ZJ2yOHqbeU_BfPcSkW9-HbjipKaNKUCIUG7bEtGWCjzFAo0_BHatw1gTrkZVu9R8rPbLSE6shuZySMDzx7SDoaBx0BqwLYJK23v3b8QP4EnUt</recordid><startdate>201912</startdate><enddate>201912</enddate><creator>Winnefeld, Frank</creator><creator>Epifania, Eugenia</creator><creator>Montagnaro, Fabio</creator><creator>Gartner, Ellis M.</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>201912</creationdate><title>Further studies of the hydration of MgO-hydromagnesite blends</title><author>Winnefeld, Frank ; Epifania, Eugenia ; Montagnaro, Fabio ; Gartner, Ellis M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c392t-30ea9284828f0a5746471e653b4fce4527ad086516b7f6572d9d97c02d2b63613</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Artinite</topic><topic>Basic magnesium carbonate</topic><topic>Brucite</topic><topic>Cement</topic><topic>Crystal structure</topic><topic>Crystallinity</topic><topic>Dypingite</topic><topic>Hydration</topic><topic>Hydromagnesite</topic><topic>Magnesium hydroxide</topic><topic>Magnesium oxide</topic><topic>Mixtures</topic><topic>Raman spectroscopy</topic><topic>Reaction kinetics</topic><topic>Reaction products</topic><topic>Sodium bicarbonate</topic><topic>Superconductors (materials)</topic><topic>Thermogravimetry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Winnefeld, Frank</creatorcontrib><creatorcontrib>Epifania, Eugenia</creatorcontrib><creatorcontrib>Montagnaro, Fabio</creatorcontrib><creatorcontrib>Gartner, Ellis M.</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>Winnefeld, Frank</au><au>Epifania, Eugenia</au><au>Montagnaro, Fabio</au><au>Gartner, Ellis M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Further studies of the hydration of MgO-hydromagnesite blends</atitle><jtitle>Cement and concrete research</jtitle><date>2019-12</date><risdate>2019</risdate><volume>126</volume><spage>105912</spage><pages>105912-</pages><artnum>105912</artnum><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>The hydration of magnesium oxide in the presence of hydromagnesite (Mg5(CO3)4(OH)2·4H2O) was investigated. The hydration products are a poorly-crystalline form of brucite (Mg(OH)2) and an unknown amorphous or poorly crystalline hydrate, which was evidenced by X-ray diffraction analyses and Raman spectroscopy. By thermogravimetry it was found that in the presence of hydromagnesite more water is bound in hydrate phases than can be explained by the formation of brucite only. The unknown hydrate is hypothesized to lead to cohesive binding in MgO-hydromagnesite blends. Due to thermodynamic predictions artinite (Mg2(CO3)(OH)2·3H2O) should be the stable hydrate in this system. The addition of artinite crystal seeds, however, had no significant effect on hydration kinetics or nature of the reaction products. The hypothesis that the addition of sodium bicarbonate (NaHCO3) could modify or accelerate the hydration reactions due to its high solubility and the supply of additional HCO3− ions was also not supported by the experiments.</abstract><cop>Elmsford</cop><pub>Elsevier Ltd</pub><doi>10.1016/j.cemconres.2019.105912</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Artinite Basic magnesium carbonate Brucite Cement Crystal structure Crystallinity Dypingite Hydration Hydromagnesite Magnesium hydroxide Magnesium oxide Mixtures Raman spectroscopy Reaction kinetics Reaction products Sodium bicarbonate Superconductors (materials) Thermogravimetry |
| title | Further studies of the hydration of MgO-hydromagnesite blends |
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