Microstructural evolution/durability of magnesium phosphate cement paste over time in neutral and basic environments
This study investigates the evolutions of the mineralogy, pore solution and porosity of magnesium potassium phosphate cement pastes (MKPC) over time in neutral and basic environments, media that MKPC pastes might encounter when used as patch repair materials or as stabilization materials for hazardo...
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| Veröffentlicht in: | Cement and concrete research 2019-08, Vol.122, p.42-58 |
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| creator | Lahalle, Hugo Patapy, Cédric Glid, Marwa Renaudin, Guillaume Cyr, Martin |
| description | This study investigates the evolutions of the mineralogy, pore solution and porosity of magnesium potassium phosphate cement pastes (MKPC) over time in neutral and basic environments, media that MKPC pastes might encounter when used as patch repair materials or as stabilization materials for hazardous wastes. Mineralogy evolutions were characterized by X-ray diffraction/Rietveld (XRD) and thermogravimetric analyses (TGA) and completed with scanning electron microscopy (SEM/EDX) microanalyses. Pore solution compositions (ICP-OES, IC) and the porosity of the materials were also analyzed. The results showed an amorphization of MKPC pastes over time that might be related to structural changes for the K-struvite phase. Achieving chemical equilibrium between the cementitious waters and the MKPC pore solution can result in porosity evolutions within the materials. Transport and mechanical changes might be expected, especially for MKPC pastes kept in basic media, since K-struvite [MgKPO4·6H2O], could be partially dissolved, leading to a higher total pore volume. |
| doi_str_mv | 10.1016/j.cemconres.2019.04.011 |
| format | Article |
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Mineralogy evolutions were characterized by X-ray diffraction/Rietveld (XRD) and thermogravimetric analyses (TGA) and completed with scanning electron microscopy (SEM/EDX) microanalyses. Pore solution compositions (ICP-OES, IC) and the porosity of the materials were also analyzed. The results showed an amorphization of MKPC pastes over time that might be related to structural changes for the K-struvite phase. Achieving chemical equilibrium between the cementitious waters and the MKPC pore solution can result in porosity evolutions within the materials. 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Transport and mechanical changes might be expected, especially for MKPC pastes kept in basic media, since K-struvite [MgKPO4·6H2O], could be partially dissolved, leading to a higher total pore volume.</description><subject>Amorphization</subject><subject>B: crystal structure</subject><subject>B: pore solution</subject><subject>C: aging</subject><subject>C: durability</subject><subject>Cement</subject><subject>Cement paste</subject><subject>Chemical Sciences</subject><subject>D: chemically-bonded ceramics</subject><subject>Hazardous materials</subject><subject>Hazardous wastes</subject><subject>Magnesium phosphate</subject><subject>Mineralogy</subject><subject>Organic chemistry</subject><subject>Porosity</subject><subject>Potassium phosphates</subject><subject>Scanning electron microscopy</subject><issn>0008-8846</issn><issn>1873-3948</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNqFUU1r3DAUFKWFbpP-hgh6ysGOZNla6biEfMGGXJKz0MpPWS225EqyIf8-Mlty7ekxj5l5H4PQFSU1JZTfnGoDowk-QqobQmVN2ppQ-g1tqNiyislWfEcbQoiohGj5T_QrpVOBvGFig_KzMzGkHGeT56gHDEsY5uyCv-kLPrjB5Q8cLB71u4fk5hFPx5Cmo86Ay2DwGU86FRAWiDi7EbDz2MOcVzfte3zQyRkMfnEx-FWQLtEPq4cEv__VC_R2f_d6-1jtXx6ebnf7yrS8yxUYtjVNZ3oteVmXWNJpTSXjTNLOyg62HbWNbAk3xIrWGmAHyXujrWAd04ZdoOuz71EPaopu1PFDBe3U426v1h5paJELvtDC_XPmTjH8nSFldQpz9GU91TRluKQt7Qpre2atT0sR7JctJWqNQ53UVxxqjUORVpU4inJ3VkI5eHEQVTIOvIHeRTBZ9cH91-MTvXqaEQ</recordid><startdate>20190801</startdate><enddate>20190801</enddate><creator>Lahalle, Hugo</creator><creator>Patapy, Cédric</creator><creator>Glid, Marwa</creator><creator>Renaudin, Guillaume</creator><creator>Cyr, Martin</creator><general>Elsevier Ltd</general><general>Elsevier BV</general><general>Elsevier</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>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0003-3538-7893</orcidid><orcidid>https://orcid.org/0000-0002-5012-9131</orcidid></search><sort><creationdate>20190801</creationdate><title>Microstructural evolution/durability of magnesium phosphate cement paste over time in neutral and basic environments</title><author>Lahalle, Hugo ; Patapy, Cédric ; Glid, Marwa ; Renaudin, Guillaume ; Cyr, Martin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c465t-ec37c25cda960620f05aa19363915f95e751f29406c0f84fce3b96dcaf8353ac3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Amorphization</topic><topic>B: crystal structure</topic><topic>B: pore solution</topic><topic>C: aging</topic><topic>C: durability</topic><topic>Cement</topic><topic>Cement paste</topic><topic>Chemical Sciences</topic><topic>D: chemically-bonded ceramics</topic><topic>Hazardous materials</topic><topic>Hazardous wastes</topic><topic>Magnesium phosphate</topic><topic>Mineralogy</topic><topic>Organic chemistry</topic><topic>Porosity</topic><topic>Potassium phosphates</topic><topic>Scanning electron microscopy</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Lahalle, Hugo</creatorcontrib><creatorcontrib>Patapy, Cédric</creatorcontrib><creatorcontrib>Glid, Marwa</creatorcontrib><creatorcontrib>Renaudin, Guillaume</creatorcontrib><creatorcontrib>Cyr, Martin</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><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Cement and concrete research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lahalle, Hugo</au><au>Patapy, Cédric</au><au>Glid, Marwa</au><au>Renaudin, Guillaume</au><au>Cyr, Martin</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microstructural evolution/durability of magnesium phosphate cement paste over time in neutral and basic environments</atitle><jtitle>Cement and concrete research</jtitle><date>2019-08-01</date><risdate>2019</risdate><volume>122</volume><spage>42</spage><epage>58</epage><pages>42-58</pages><issn>0008-8846</issn><eissn>1873-3948</eissn><abstract>This study investigates the evolutions of the mineralogy, pore solution and porosity of magnesium potassium phosphate cement pastes (MKPC) over time in neutral and basic environments, media that MKPC pastes might encounter when used as patch repair materials or as stabilization materials for hazardous wastes. Mineralogy evolutions were characterized by X-ray diffraction/Rietveld (XRD) and thermogravimetric analyses (TGA) and completed with scanning electron microscopy (SEM/EDX) microanalyses. Pore solution compositions (ICP-OES, IC) and the porosity of the materials were also analyzed. The results showed an amorphization of MKPC pastes over time that might be related to structural changes for the K-struvite phase. Achieving chemical equilibrium between the cementitious waters and the MKPC pore solution can result in porosity evolutions within the materials. 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| ispartof | Cement and concrete research, 2019-08, Vol.122, p.42-58 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Amorphization B: crystal structure B: pore solution C: aging C: durability Cement Cement paste Chemical Sciences D: chemically-bonded ceramics Hazardous materials Hazardous wastes Magnesium phosphate Mineralogy Organic chemistry Porosity Potassium phosphates Scanning electron microscopy |
| title | Microstructural evolution/durability of magnesium phosphate cement paste over time in neutral and basic environments |
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