1. Study on water instability of magnesium potassium phosphate cement mortar based on low-field 1H nuclear magnetic resonance.
- Author
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Wang, Yong, Liu, Zhining, He, Fuqiang, Zhuo, Weidong, Yuan, Qiang, Chen, Changping, and Yang, Jianming
- Subjects
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NUCLEAR magnetic resonance , *POTASSIUM phosphates , *POTASSIUM dihydrogen phosphate , *NUCLEAR magnetic resonance spectroscopy , *MORTAR , *MAGNESIUM phosphate , *CEMENT , *ALKALINE solutions - Abstract
• This study focused on the microstructure deterioration of MKPC in solutions. • LF-NMR was introduced for the first time to observe the degradation process of MKPC. • The coarsening process of micropores in MKPC was detailed by LF-NMR in-situ. Low-field 1H nuclear magnetic resonance (LF-NMR) is applied to investigate water instability of magnesium potassium phosphate cement (MKPC) mortar immersed in neutral and alkaline solutions, aiming to introduce a in-situ monitoring of microstructure to demonstrate the deterioration process of MKPC mortar. By tracking the evolution of water bearing pore, the deterioration is well characterized, and mainly attributed to the coarsening of micro-pores in the K-struvite network. Compared with tap water, 2.5 wt% NaCl and MgSO 4 solutions, dramatical deterioration of strength and microstructure are detected in the MKPC mortar exposed in 2.5 wt% NaOH solution. In addition, the millimeter sized water cavity is formed due to the opening of the spherical closed pores in the later exposure stage in both neutral and alkaline solutions. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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