Mechanistic Study of the Effects of Magnesia Reactivity on Setting and Hardening of Basic Magnesium Sulfate Cement
Source abstract
Abstract
Basic magnesium sulfate (BMS) cement was prepared by magnesia with different reactivities derived from calcination of basic magnesium carbonate at 600 to 1000°C. The effects of reactivity of magnesia on the setting time and compressive strength of BMS cement was investigated. Furthermore, XRD, SEM, MIP, hydration heat evolution and the pore solution composition were used to analyze the action mechanism of magnesia reactivity. The results show that the main strength phase of 5Mg(OH)2•MgSO4•7H2O (5•1•7 phase) was formed in BMS cement prepared by magnesia with calcination temperature higher than 600°C. The magnesia with a high BET surface area and low crystallite dimension showed a high adsorption capacity for citrate ions in magnesium sulfate solution, decreasing their concentration in the pore solution. By acting as a soft template for 5•1•7 phase formation, the decrease in citrate ions resulted in a low amount of 5•1•7 phase, forming Mg(OH)2 instead, leading to a low-strength BMS cement.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnesium Oxide Properties and Applications · Layered Double Hydroxides Synthesis and Applications · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Qinghai University, Xining 810016, China.
School of Civil Engineering, Qinghai University and Qinghai Provincial Key Laboratory of Energy-saving Building Materials and Engineering Safety, Xining 810016, China.
Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
References (28)
Show source-provided references
1. 1) Chen, W. H., Wu, C. Y., Yu, H. F. and Chen, Y. J., (2017). “Effect of calcined MgO-rich byproduct from the extraction of Li2CO3 on the performance of magnesium phosphate cement.” Journal of Advanced Concrete Technology, 15(12), 749-759.10.3151/jact.15.749 ↗
2. 2) Chen, Y. J., Wu, C. Y., Yu, H. F. and Chen, C., (2018). “Study of using light-burned dolomite ores as raw material to produce magnesium oxysulfate cement.” Advances in Cement Research, 30, 437-450.10.1680/jadcr.17.00165 ↗
3. 3) Dong, J. M., Yu, H. F. and Zhang, L. M., (2010). “Study on experimental conditions of hydration methods of determining active magnesium oxide content.” Journal of Salt Lake Research, 1838-1841.
4. 4) Guo, T., Wang, H. F., Yang, H. J., Cai, X. S., Ma, Q. and Yang, S. M., (2017). “The mechanical properties of magnesium oxysulfate cement enhanced with 517 phase magnesium oxysulfate whiskers.” Construction and Building Materials, 150, 844-850.10.1016/j.conbuildmat.2017.06.024 ↗
5. 5) He, Z., Cai, R., Chen, E. and Tang, S., (2019). “The investigation of early hydration and pore structure for limestone powder wastes blended cement pastes.” Construction and Building Materials, 229, 116923.10.1016/j.conbuildmat.2019.116923 ↗
6. 6) Hu, Q. F., Song, L. Y. and Hu, X. X., (2007). “Study on the preparation of activated magnesium oxide by brine-ammonium carbonate method.” Salt Industry and Chemical Industry, 6, 17-20.
7. 7) Kahle, K., (1972). “Mechanism formation of magnesium-sulfate cements.” Silikatechnik, 69(9), 148-151.
8. 8) Li, Z. G., Ji, Z. S., Jiang, L. L. and Yu, S. W., (2017). “Effect of additives on the properties of magnesium oxysulfate cement.” Journal of Intelligent and Fuzzy Systems, 33(5), 3021-3025.10.3233/JIFS-169353 ↗
9. 9) Liu, W. P., Xu, H., Shi, X. C., Yang, X. Y. and Wang, X. M., (2019). “Improved lime method to prepare high-purity magnesium hydroxide and light magnesia from Bischofite.” Journal of Materials, 71(12), 4674-4680.10.1007/s11837-019-03602-9 ↗
10. 10) Li, Z. G., Yu, S. W. and Liu, T. H., (2017). “Effect of active MgO content on strength and hydration products of basic magnesium sulfate cement.” Silicate Bulletin, 36, 2259-2262.
11. 11) Li, X., Qiu, R. F., Xue, F. B., Fang, L. and Cheng, F. Q., (2020). “Effects of unreactive MgO and impurities in light burned MgO on the hydration process and performance of base magnesium sulfate cement.” Construction and Building Materials, 240, 117854.10.1016/j.conbuildmat.2019.117854 ↗
12. 12) Luong, V. T., Amal, R., Scott, J. A., Ehrenberger, S. and Tran, T., (2018). “A comparison of carbon footprints of magnesium oxide and magnesium hydroxide produced from conventional processes.” Journal of Cleaner Production, 202(11), 1035-1044.10.1016/j.jclepro.2018.08.225 ↗
13. 13) Morozov, S. A., Malkov, A. A. and Malygin, A. A., (2003). “Synthesis of porous magnesium oxide by thermal decomposition of basic magnesium carbonate.” Russian Journal of General Chemistry, 73, 34-42.
14. 14) Qin, L., Gao, X. J., Li, W. G. and Ye, H., (2018). “Modification of magnesium oxysulfate cement by incorporating weak acids.” Journal of Materials in Civil Engineering, 30(9), 04018209.10.1061/(ASCE)MT.1943-5533.0002418 ↗
15. 15) Qu, P. J., (2010). “Determination of citric acid in liquid fertilizer by visibility spectrophotometry.” Shanxi Chemical Industry, 30(3), 39-40. (in Chinese)
16. 16) Runčevski, T., Wu, C. Y., Yu, H. F., Yang, B. and Dinnebier, R. E., (2013). “Structural characterization of a new magnesium oxysulfate hydrate cement phase and its surface reactions with atmospheric carbon dioxide.” Journal of the American Ceramic Society, 96, 3609-3616.10.1111/jace.12556 ↗
17. 17) Tan, Y. S., Yu, H. F., Li, Y., Wu, C. Y., Dong, J. M. and Wen, J., (2014). “Magnesium potassium phosphate cement prepared by the byproduct of magnesium oxide after producing Li2CO3 from salt lakes.” Ceramics International, 40, 13543-13551.10.1016/j.ceramint.2014.05.063 ↗
18. 18) Wang, N., Yu, H. F., Bi, W. L., Tan, Y. S., Zhang, N., Wu, C. Y., Ma, H. Y. and Shi, H., (2018). “Effects of sodium citrate and citric acid on the properties of magnesium oxysulfate cement.” Construction and Building Materials, 169, 697-704.10.1016/j.conbuildmat.2018.02.208 ↗
19. 19) Walling, S. A. and Provis, J. L., (2016). “Magnesium-based cements: A journey of 150 years, and cements for the future?” Chemical Reviews, 116(7), 4170-4204.10.1021/acs.chemrev.5b00463 ↗
20. 20) Wen, J., Yu, H. F., Li, Y., Wu, C. Y. and Dong, J. M., (2014). “Effects of citric acid on hydration process and mechanical properties of thermal decomposed magnesium oxychloride cement.” Journal of Wuhan University of Technology (Materials Science Edition), 29, 114-118.10.1007/s11595-014-0877-8 ↗
21. 21) Wu, C. Y., Yu, H. F., Dong, J. M. and Zheng, L. N., (2014). “Effects of material ratio, fly ash, and citric acid on magnesium oxysulfate cement.” ACI Materials Journal, 111(3), 291-297.10.14359/51686723 ↗
22. 22) Wu, C. Y., Chen, W. H., Zhang, H. F., Yu, H. F., Zhang, W. Y., Jiang, N. S. and Liu, L. X., (2017). “The hydration mechanism and performance of modified magnesium oxysulfate cement by tartaric acid.” Construction and Building Materials, 144, 516-524.10.1016/j.conbuildmat.2017.03.222 ↗
23. 23) Wu, C. Y., Yu, H. F., Zhang, H. F., Dong, J. M., Wen, J. and Tan, Y. S., (2015). “Effects of phosphoric acid and phosphates on magnesium oxysulfate cement.” Materials and Structures, 48(4), 907-917.10.1617/s11527-013-0202-6 ↗
24. 24) Wu, C. Y., Yu, H. F. and Zhang, H. F., (2016). “Preparation and properties of modified magnesium oxysulfate and cement derives from waste sulfuric acid.” Advances in Cement Research, 28(3), 178-188.10.1680/jadcr.15.00011 ↗
25. 25) Wu, C. Y., (2014). “Fundamental theory and civil engineering application of basic magnesium sulfate cement.” Thesis (PhD). The University of Chinese Academy of Sciences. (in Chinese)
26. 26) Wu, C. Y., Chen, C., Zhang, H. F., Tan, Y. S. and Yu, H. F., (2018). “Preparation of magnesium oxysulfate cement using magnesium-rich by products from the production of lithium carbonate from salt lakes.” Construction and Building Materials, 172, 597-607.10.1016/j.conbuildmat.2018.04.005 ↗
27. 27) Wu, C. Y., Luo, K. J., Zhang, H. F. and Yu, H. F., (2019). “Effects of 5•1•7 phase seed crystal on performance of magnesium oxysulfate cement.” Journal of Advanced Concrete Technology, 17(10), 603-615.10.3151/jact.17.603 ↗
28. 28) Zhou, X. M. and Li, Z. J., (2012). “Light-weight wood-magnesium oxychloride cement composite building products made by extrusion.” Construction and Building Materials, 27(1), 382-389.10.1016/j.conbuildmat.2011.07.033 ↗