Microstructure and micromechanical properties of magnesium phosphate cement

Zhang, Guosheng; Wang, Qiang; Li, Yue; Zhang, Mingzhong

doi:10.1016/j.cemconres.2023.107227

Cited by 26 publications

(2 citation statements)

References 57 publications

(93 reference statements)

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“…For M0.75W0.14 in the plain environment, increasing the curing age from 1 day to 180 days led to a reduction of 4.97% in the total porosity. As mentioned in the previous literature [15], the continuous reaction between MgO and phosphate can reduce both capillary pores and macropores. However, a substantial increase in the volume of macropores was measured for M0.75W0.14 in the plateau environment between 1 and 180 days, which could explain the strength degradation shown in Figures 3b and 4b.…”

Section: Pore Structurementioning

confidence: 69%

“…Magnesium phosphate cement (MPC), also known as chemically bonded magnesium phosphate ceramic [7], has been receiving a growing amount of attention over recent decades as an alternative to traditional Portland cement (PC), and is being actively studied for special applications, such as construction and rapid repairs [8][9][10], hazardous waste or nuclear waste solidification [10,11], and biomedical materials [12]. The microstructure and performance development of MPC rely on the acid-base neutralization reaction between MgO and phosphate to yield struvite, MgNH 4 PO 4 •6H 2 O (Equation ( 1)) or K-struvite, MgKPO 4 •6H 2 O (Equation ( 2)) [7,[13][14][15]. Due to the unique compositions and reaction mechanisms, MPC has many advantageous characteristics compared with traditional PC and other inorganic binders.…”

Section: Introductionmentioning

confidence: 99%

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Strength and Microstructural Evolution of Magnesium Phosphate Cement Mortar in Plateau Environment

Ren,

Qin,

Gao

et al. 2024

Buildings

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Climatic conditions in plateau areas can enormously affect the properties and microstructure of cement-based materials. This research investigates the strength development and microstructural changes in magnesium phosphate cement (MPC) mortars in a plateau environment. Experiments were conducted in parallel in a plateau area (Lhasa) and a plain area (Chengdu) to evaluate the effects of the water-to-binder ratio (w/b = 0.12, 0.14 and 0.16) and sand-to-binder ratio (s/b = 0.5, 0.75 and 1) on the compressive and flexural strength of MPC mortars. At the same time, hydration products were characterized via XRD, TGA, and SEM/EDX micro-analyses, and the porosity of the materials was also analyzed via MIP. The results demonstrated that curing in a plateau environment resulted in a decrease in workability and yielded higher strength at an early age (before 1 day) but degraded the long-term (180-day) strength of MPC mortars when compared with curing in a plain environment, irrespective of w/b and s/b ratios. Unlike the plain group, the plateau group revealed the deterioration of microstructures over time, including the decrease in struvite content, the morphology change in struvite crystals, and the increase in porosity, which resulted in the degradation of mechanical properties between 1 and 180 days. The strength loss can be effectively alleviated at lower w/b and s/b ratios.

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Section: Pore Structurementioning

confidence: 69%