Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement
High-alumina cement has an important position in refractory materials with its good performance at high temperatures, but its disadvantages such as strength inversion and unstable transformation of hydration products have always limited its development. To clarify the working mechanism of high-alumi...
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| Format: | Article |
| Language: | English |
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Kaunas University of Technology
2023-12-01
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| Series: | Medžiagotyra |
| Subjects: | |
| Online Access: | https://matsc.ktu.lt/index.php/MatSc/article/view/33912 |
| _version_ | 1797435875427090432 |
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| author | Yibo WANG Jinbo GAO |
| author_facet | Yibo WANG Jinbo GAO |
| author_sort | Yibo WANG |
| collection | DOAJ |
| description | High-alumina cement has an important position in refractory materials with its good performance at high temperatures, but its disadvantages such as strength inversion and unstable transformation of hydration products have always limited its development. To clarify the working mechanism of high-alumina cement and improve its high temperature resistance, MgO and Al2O3 were added to the high-alumina cement paste. The optimal design method was used to determine the influence of each factor on the high temperature stability of the cement paste. The mix ratio of raw materials was optimized and the strength change patterns of the specimens under the optimal ratio were verified. From a microstructure perspective, the high temperature evolution of the hardened paste of high-alumina cement was explored using X-ray diffraction, scanning electron microscopy, thermogravimetry, and differential scanning calorimetry. The results show that the introduction of refractory powders, especially Al2O3, can significantly improve the volumetric stability of the cement paste at high temperatures. When the water-cement ratio is 0.20, the admixture of MgO is 5 % or 10 %, and Al2O3 is 20 %, the high temperature volume stability of the cement paste is the best. However, its corresponding mechanical strength is weakened to some extent with an increase in calcinating temperature. Moreover, the structure-property evolution process of cementite under high temperature calcinating conditions was verified by microstructural characterization, especially the influence of the powder on the volume and strength of the cement block at high temperatures. The results of this study can serve as a guide for the development of high-alumina cement and its cementing materials, as well as for the improvement of their properties. |
| first_indexed | 2024-03-09T10:53:39Z |
| format | Article |
| id | doaj.art-bfb906c9ad604640b56233e8415c8149 |
| institution | Directory Open Access Journal |
| issn | 1392-1320 2029-7289 |
| language | English |
| last_indexed | 2024-03-09T10:53:39Z |
| publishDate | 2023-12-01 |
| publisher | Kaunas University of Technology |
| record_format | Article |
| series | Medžiagotyra |
| spelling | doaj.art-bfb906c9ad604640b56233e8415c81492023-12-01T04:27:57ZengKaunas University of TechnologyMedžiagotyra1392-13202029-72892023-12-0129449049710.5755/j02.ms.3391239166Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina CementYibo WANG0https://orcid.org/0000-0002-1038-5958Jinbo GAO1East China University of Science and TechnologyLiaoning Provincial Transportation Planning and Design Institute Co.High-alumina cement has an important position in refractory materials with its good performance at high temperatures, but its disadvantages such as strength inversion and unstable transformation of hydration products have always limited its development. To clarify the working mechanism of high-alumina cement and improve its high temperature resistance, MgO and Al2O3 were added to the high-alumina cement paste. The optimal design method was used to determine the influence of each factor on the high temperature stability of the cement paste. The mix ratio of raw materials was optimized and the strength change patterns of the specimens under the optimal ratio were verified. From a microstructure perspective, the high temperature evolution of the hardened paste of high-alumina cement was explored using X-ray diffraction, scanning electron microscopy, thermogravimetry, and differential scanning calorimetry. The results show that the introduction of refractory powders, especially Al2O3, can significantly improve the volumetric stability of the cement paste at high temperatures. When the water-cement ratio is 0.20, the admixture of MgO is 5 % or 10 %, and Al2O3 is 20 %, the high temperature volume stability of the cement paste is the best. However, its corresponding mechanical strength is weakened to some extent with an increase in calcinating temperature. Moreover, the structure-property evolution process of cementite under high temperature calcinating conditions was verified by microstructural characterization, especially the influence of the powder on the volume and strength of the cement block at high temperatures. The results of this study can serve as a guide for the development of high-alumina cement and its cementing materials, as well as for the improvement of their properties.https://matsc.ktu.lt/index.php/MatSc/article/view/33912aluminate cementhigh temperatureorthogonal designcompressive strengthmeso-structure |
| spellingShingle | Yibo WANG Jinbo GAO Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement Medžiagotyra aluminate cement high temperature orthogonal design compressive strength meso-structure |
| title | Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement |
| title_full | Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement |
| title_fullStr | Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement |
| title_full_unstemmed | Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement |
| title_short | Effect of MgO and Al2O3 on High-temperature Stability Performance of High-alumina Cement |
| title_sort | effect of mgo and al2o3 on high temperature stability performance of high alumina cement |
| topic | aluminate cement high temperature orthogonal design compressive strength meso-structure |
| url | https://matsc.ktu.lt/index.php/MatSc/article/view/33912 |
| work_keys_str_mv | AT yibowang effectofmgoandal2o3onhightemperaturestabilityperformanceofhighaluminacement AT jinbogao effectofmgoandal2o3onhightemperaturestabilityperformanceofhighaluminacement |