Sulfuric acid-resistance performances of magnesium phosphate cements: Macro-properties, mineralogy and microstructure evolutions

Shi, Jie; Zhao, Jinguang; Chen, Heng; Hou, Pengkun; Kawashima, Shiho; Qin, Jihui; Zhou, Xin; Qian, Jueshi

doi:10.1016/j.cemconres.2022.106830

Cited by 38 publications

(9 citation statements)

References 56 publications

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“…As shown in Figure 1 , the flexural strength and compressive strength of both M0 and M1 increased first to a peak and then decreased as the erosion grew in the four corrosion conditions, while they increased continuously under air curing. After 40 dry–wet cycles, both M0 and M1 showed a higher compressive strength than the air-cured samples, possibly due to better paste hydration resulting from corrosion-induced water adsorption [ 13 , 18 , 36 ]. The M0 paste subjected to the DW environment at first had a higher strength than the MKPC specimen subjected to the SK environment under the same hydration time.…”

Section: Resultsmentioning

confidence: 99%

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Corrosion Behavior of Magnesium Potassium Phosphate Cement under Wet–Dry Cycle and Sulfate Attack

et al. 2023

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This paper investigated the influence of dry–wet cycles and sulfate attack on the performance of magnesium potassium phosphate cement (MKPC) as well as the effect of waterglass on MKPC. X-ray diffraction (XRD), TG-DTG, and scanning electron microscopy (SEM-EDS) were used to examine the phase composition and microstructure of MKPC. The results showed that the flexural and compressive strength of an MKPC paste increased initially and subsequently decreased in different erosion environments. The final strength of the M0 paste exposed to the SK-Ⅱ environment was the highest, while that of the M0 paste exposed to the DW-Ⅱ environment was the lowest. The final volume expansion value of MKPC specimens under four corrosion conditions decreased in the following order: DW-Ⅱ, M0 > SK-Ⅱ, M0 > DW-Ⅱ, M1 > SK-Ⅰ, M0 > DW-Ⅰ, M0. Compared to the full-soaking environment, the dry–wet cycles accelerated sulfate erosion and the appearance of damages in the macro and micro structure of the MKPC paste. With the increase in the number of the dry and wet cycles, more intrinsic micro-cracks were observed, and the dissolution of hydration products was accelerated. Under the same number of dry–wet cycles, the strength test and volume stability test showed that the durability in a Na2SO4 solution of the MKPC paste prepared with 2% waterglass (M1) was superior to that of the original M0 cement. The micro analysis indicated that waterglass can improve the compactness of the microstructure of MPC and prevent the dissolution of struvite-K.

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Section: Resultsmentioning

confidence: 99%

“…All specimens exhibited expansion deformation, and the value increased as the number of dry–wet cycles increased. This can be attributed to the increased degree of hydration in environments with excess liquid phase [ 36 ]. Furthermore, the unreacted MgO and H 2 O formed Mg(OH) 2 , resulting in volume expansion [ 10 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Corrosion Behavior of Magnesium Potassium Phosphate Cement under Wet–Dry Cycle and Sulfate Attack

et al. 2023

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“…Dead burned MgO is characterized by a neutralization time greater than 900 s. The low reactivity of MgO is necessary to guarantee a homogeneous mix between the powder and the liquid component when preparing a cement; even so, it is often necessary to use a retarder to obtain the desired setting time (see Section 5.1 ). It should be pointed out that, especially for MPCs applied in the construction field, MgO is typically not pure and can also contain certain amounts of CaO, SiO 2 , Al 2 O 3 , Fe 2 O 3 , K 2 O, Na 2 O, TiO 2 , SO 3 , and P 2 O 5 [ 61 , 62 , 74 , 80 , 95 , 97 , 98 , 131 ].…”

Section: Magnesium Phosphate Cements: Preparation and Propertiesmentioning

confidence: 99%

“…For this purpose, the role of additives that could prolong the setting time and in turn increase the workability and moldability of cements has been investigated in the literature. The data summarized in Table 2 show that by far the most widely investigated retarder for MPCs is borax (Na 2 B 4 O 7 ·10H 2 O)/boric acid (H 3 BO 3 ), in both the biomedical [ 57 , 58 , 63 , 77 , 126 , 135 ] and (particularly) construction fields [ 59 , 62 , 64 , 65 , 66 , 67 , 68 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 80 , 82 , 83 , 84 , 85 , 86 , 87 , 89 , 90 , 91 , 92 , 101 , 102 , 104 , 107 , 112 , 113 , 116 , 119 , 120 , 124 , 128 , 129 , 130 , 131 , 136 ]. Borax was in fact traditionally used to delay the setting time of MgO-based MPCs, and its setting mechanism has been well investigated in the literature, from both an experimental and a theoretical perspective [ ...…”

Section: Modifications Of Mpcsmentioning

confidence: 99%

An Overview of Magnesium-Phosphate-Based Cements as Bone Repair Materials

Gelli,

Ridi

2023

JFB

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In the search for effective biomaterials for bone repair, magnesium phosphate cements (MPCs) are nowadays gaining importance as bone void fillers thanks to their many attractive features that overcome some of the limitations of the well-investigated calcium-phosphate-based cements. The goal of this review was to highlight the main properties and applications of MPCs in the orthopedic field, focusing on the different types of formulations that have been described in the literature, their main features, and the in vivo and in vitro response towards them. The presented results will be useful to showcase the potential of MPCs in the orthopedic field and will suggest novel strategies to further boost their clinical application.

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“…In recent years, practicability [ 13 , 14 , 15 , 16 ], new retarders [ 17 , 18 ], durability [ 19 , 20 ] and effects of new admixtures [ 18 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ] were focuses of research on MKPC. However, the hydration mechanism of MKPC has always been one of the key issues.…”

Section: Introductionmentioning

confidence: 99%

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

Leng,

Fu,

et al. 2024

Materials

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Magnesium potassium phosphate cement (MKPC) is formed on the basis of acid–base reaction between dead burnt MgO and KH2PO4 in aqueous solution with K-struvite as the main cementitious phase. Due to the unique characteristics of these cements, they are suitable for special applications, especially the immobilization of radioactive metal cations and road repair projects at low temperature. However, there are few articles about the hydration mechanism of MKPC. In this study, the types, proportions and formation mechanism of MKPC crystalline phases under different magnesium to phosphorus (Mg/P) ratios were studied by means of AAS, ICP-OES, SEM, EDS and XRD refinement methods. Corresponding MD simulation works were used to explain the hydration mechanism. This study highlights the fact that crystalline phases distribution of MKPC could be adjusted and controlled by different Mg/P ratios for the design of the MKPC, and the key factor is the kinetic of K+.

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Sulfuric acid-resistance performances of magnesium phosphate cements: Macro-properties, mineralogy and microstructure evolutions

Cited by 38 publications

References 56 publications

Corrosion Behavior of Magnesium Potassium Phosphate Cement under Wet–Dry Cycle and Sulfate Attack

Corrosion Behavior of Magnesium Potassium Phosphate Cement under Wet–Dry Cycle and Sulfate Attack

An Overview of Magnesium-Phosphate-Based Cements as Bone Repair Materials

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

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