Experimental research of water stability of magnesium alumina phosphate cements mortar

Fan, Shijian; Chen, Bing

doi:10.1016/j.conbuildmat.2015.06.050

Cited by 77 publications

(19 citation statements)

References 32 publications

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“…The content of K-struvite at the curing age of 7 days was larger, whereas the corresponding MgO content was lower than that at the curing age of 1 day. The contents of K-struvite and MgO of MPC samples at the curing age of 7 + 28 days decreased, which was in accordance with the findings of Fan [51], because K-struvite and MgO partly dissolved in the MPC samples under the condition of water immersion, verifying that poor water resistance of MPC was due to the part dissolution of K-struvite and MgO after water immersion.…”

Section: Resultssupporting

confidence: 88%

Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed with Ferroaluminate Cement

et al. 2019

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A certain amount of ferroaluminate cement (FAC) was substituted for MgO during the magnesium phosphate cement (MPC) preparation to obtain the MPC–FAC composite cement. The influence of FAC on the strength, water resistance, pH, and setting time of MPC–FAC composite cement were examined. The microstructure and chemical composition were also analyzed by adopting scanning electron microscopic energy-dispersive spectrometer and X-ray diffraction, respectively. The study showed that setting time of MPC–FAC composite cement was dramatically prolonged when FAC substitution for MgO was between 30 and 40 wt %. The strength of MPC–FAC did not decrease during the early curing time (1 h and 1 d), whereas it increased during the late curing time (3, 7, and 28 days). Moreover, the existence of FAC decreased the hydrated product K-struvite during the early curing time and thus dramatically enhanced the water-resistance of MPC–FAC. With the addition of FAC, a large number of cementitious materials of AFt and AFm, as well as flocculent colloidal substances of AH3, C–S–H, and FH3, were generated during the hydration of MPC, which were filled in the internal pore of the hydrate. Thus, the internal compactness of the sample increased, while the compact protective covering layer was generated on the surface to enhance the water resistance and strength in the late curing time.

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Section: Resultssupporting

confidence: 88%

Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed with Ferroaluminate Cement

et al. 2019

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“…MKPC specimens with a size of 10 mm × 10 mm × 60 mm (0.394 in × 0.394 in × 2.362 in) were used for the sulfate attack test, referring to the GB 2420 standard. The corrosion resistance of MKPC was evaluated by use of a corrosion resist coefficient K, 15 which can be calculated as follows…”

Section: Methodsmentioning

confidence: 99%

“…A great deal of research has investigated the physical and mechanical properties of MPC material. 6 , 14–16 However, there has been relatively little research attention given to the utilization of desulfurized fly ash into MPC material, and even less attention to its long-term performance, especially the durability in the special service environment of shaft lining structures.…”

Section: Introductionmentioning

confidence: 99%

Long-term behaviors of phosphate-based rapid repairing material for concrete shafts in coal mines

Feng

Zhang

Wen

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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Introduction: Concrete structures in shaft linings are apt to deteriorate prematurely and therefore prompt restoration is required. In considering this, desulphurization fly ash and machine-made tuff sand are employed to fabricate a phosphatebased rapid repairing material. Methods: The long-term efficiency of the material is evaluated based on combined factors, so drying shrinkage, interfacial bonding strength, corrosion resistance, and combustibility of the specimens are tested and researched in this paper. Results: Experimental results showed that, under a dry circumstance, the material goes through a minor expansion at an early stage. It goes into a stage of rapid contraction after one day and a stable contraction after seven days. After 28 days, the total deformation is 67 micro-strains. On the other hand, the fabricated material manifests an excellent mechanical property. The one hour bending strength and compressive strength were 9.2 MPa and 32.6 MPa, respectively. A longterm mine water flushing simulation demonstrates that only 10% bending strength is lost and the corrosion resistance coefficient stays above 0.8, so a very good corrosion resistance is thus achieved. Conclusions: What is more, this repairing material retains its stability even at a high temperature of 1000°C, revealing its good thermo-stability. All these prominent properties make it a good prospective material for real restoration applications.

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“…On the contrary, the low solubility and smaller dissociation constant of KDP make it favorable to control the reaction of MPC. However, in some cases, considering the cost, ADP is preferred (Fan and Chen 2015; Ma et al, 2014). The reactions of MPC with these two types of phosphates are shown, respectively, below.…”

Section: Introductionmentioning

confidence: 99%

A study of the bond behavior of FRP bars in MPC seawater concrete

Sun

Zheng

Zhou

et al. 2020

Advances in Structural Engineering

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Using magnesium potassium phosphate cement (MPC) and fiber-reinforced polymer (FRP) bar to produce reinforced concrete can overcome the durability problems facing conventional steel reinforced PC concrete. In addition, FRP bar reinforced MPC concrete can also mitigate the CO2 emission issues caused by Portland cement (PC) production and the shortage of natural resources such as virgin aggregates and freshwater. This paper, therefore, is aimed at investigating the bond behavior of the FRP bars in MPC seawater concrete. The direct pullout tests were conducted with a steel bar, BFRP bar, and GFRP bar embedded into different concretes. The effects of reinforcing bars, type of concrete and mixing water on the bond behavior of FRP and steel bars were investigated and discussed. The results showed that the MPC concrete increases the bond strength of BFRP and GFRP bars by 51.06% and 24.42%, respectively, compared with that in PC concrete. Using seawater in MPC concrete can enhance the bond strength of GFRP bar by 13.75%. The damage interface of the FRP bar -MPC is more severe than that of PC with a complete rupture of the FRP ribs and peeling-off of the resin compared to that in steel reinforced MPC specimens. Moreover, the bond stress-slip models were developed to describe the bond behavior of MPC-FRP specimen, and the analytical results match well with the experimental data. In conclusion, the FRP bars showed better bond behavior in the MPC seawater concrete than that in the PC counterparts.

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Experimental research of water stability of magnesium alumina phosphate cements mortar

Cited by 77 publications

References 32 publications

Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed with Ferroaluminate Cement

Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed with Ferroaluminate Cement

Long-term behaviors of phosphate-based rapid repairing material for concrete shafts in coal mines

A study of the bond behavior of FRP bars in MPC seawater concrete

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