The Effect of Phosphatic Composite on Magnesium Phosphate Cement Performance
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The capacity of 10%, 30%, and 50% ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate) respectively. Magnesium phosphate cement was made by phosphate of replaced, which strength, setting time, fluidity, hydration temperature, and the hydration products was researched. The results show that: MPC was made that replaced with the equal amount of three kind of phosphate, which has good mechanical properties. Setting time and fluidity change along with the replacment. Three kind of phosphate replace ammonium dihydrogen phosphate, which change the hydration process of MPC. When ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate, the temperature of hydration is only 69.4 °C. XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.Keywords:
Ammonium dihydrogen phosphate
Magnesium phosphate
Potassium phosphate
Hydrogen phosphate
The research of this test is using ammonium dihydrogen phosphate and potassium dihydrogen phosphate as raw materials,according to the different proportion(A/K) after compound phosphate to influence the performances of magnesium phosphate cement such as expansion rate,setting time and fluidity.The X-ray diffraction is used to take the phase analysis of each sample.And the research shows that it has the least expansion rate when A/K=4∶1,and setting time is 18 min,the value of fluidity is 213 mm.Along with the increasing water-binder ratio and retarder dosage,the expansion rate of magnesium phosphate cement reduced significantly,and when A/K =3 ∶2,the phosphate cement has higher mechanical strength.
Magnesium phosphate
Ammonium dihydrogen phosphate
Potassium phosphate
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Potassium magnesium phosphate cement (MKPC) was prepared by using magnesium oxide (MgO) and potassium dihydrogen phosphate (KH2PO4, KDP). The effects of different calcination temperature, water-cement ratio and ratio on the operation of magnesium phosphate cement were studied. The effects of different water - cement ratio and ratio on the bonding strength of potassium magnesium phosphate cement and the application of potassium phosphate and magnesium cement in concrete repair and reinforcement were determined by experiments such as bending resistance, splitting, compression and bearing capacity. The experimental results show that the calcination temperature is 1100 °C, the calcination time is 1h, the settling time of magnesium oxide is 39min, and the compressive strength of one day reaches 53MPa. The water - cement ratio with the best bonding strength is 0.2, the mass ratio is 2:1.To meet the rapid repair of the construction requirements, is expected to be applied to the actual repair works.
Magnesium phosphate
Calcium phosphate cement
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Ammonium dihydrogen phosphate
Phosphoric acid
Sodium phosphates
Hydrogen phosphate
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Ammonium dihydrogen phosphate
Magnesium phosphate
Potassium phosphate
Ammonium phosphate
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Magnesium phosphate
Ammonium dihydrogen phosphate
Struvite
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Potassium magnesium phosphate cement (MKPC) was prepared by using magnesium oxide (MgO) and potassium dihydrogen phosphate (KH2PO4, KDP). The effects of different calcination temperature, water-cement ratio and ratio on the operation of magnesium phosphate cement were studied. The effects of different water - cement ratio and ratio on the bonding strength of potassium magnesium phosphate cement and the application of potassium phosphate and magnesium cement in concrete repair and reinforcement were determined by experiments such as bending resistance, splitting, compression and bearing capacity. The experimental results show that the calcination temperature is 1100 °C, the calcination time is 1h, the settling time of magnesium oxide is 39min, and the compressive strength of one day reaches 53MPa. The water - cement ratio with the best bonding strength is 0.2, the mass ratio is 2:1.To meet the rapid repair of the construction requirements, is expected to be applied to the actual repair works.
Magnesium phosphate
Potassium phosphate
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Using dead-burned magnesia(containing 95% MgO) and phosphate as raw materials,the phosphate cement with strontium has been prepared.The phase compositions,microstructure of as-prepared samples have been investigated by XRD and SEM,anti-leaching performance test has also been done with GB 7023—86(Long-term leach testing of solidified radioactive waste forms).Experimental results show that addition of 90Sr reduces the compressive strength of phosphate cement;with more 90Sr addition,the greater strength loss is found.Phosphate cement has good anti-leaching performance,the leaching rate and accumulated leaching scores are only 4.57×10-5 cm · d-1,7.39×10-3 cm in 28 day.Compared with the samples prepared by different phosphate as raw materials,the compressive strength and leaching properties of samples,with ammonium dihydrogen phosphate or potassium dihydrogen phosphate as raw material,are obviously superior to those of samples with diammonium hydrogen phosphate as raw materials.
Magnesium phosphate
Ammonium dihydrogen phosphate
Hydrogen phosphate
Potassium phosphate
Ammonium phosphate
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The capacity of 10%, 30%, and 50% ammonium dihydrogen phosphate were replaced with an equal amount of three phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, disodium hydrogen phosphate) respectively. Magnesium phosphate cement was made by phosphate of replaced, which strength, setting time, fluidity, hydration temperature, and the hydration products was researched. The results show that: MPC was made that replaced with the equal amount of three kind of phosphate, which has good mechanical properties. Setting time and fluidity change along with the replacment. Three kind of phosphate replace ammonium dihydrogen phosphate, which change the hydration process of MPC. When ammonium dihydrogen phosphate was replaced by an equal amount of disodium hydrogen phosphate, the temperature of hydration is only 69.4 °C. XRD showed that the diffraction peaks of composite’s magnesium phosphate cement increases.
Ammonium dihydrogen phosphate
Magnesium phosphate
Potassium phosphate
Hydrogen phosphate
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In early applications of Magnesia?phosphate cements (MPCs) in civil repair engineering, ammonium dihydrogen phosphate(ADP) was usually used as the phosphate component. the ADP-based MPC can be termed as magnesium ammonium phosphate cement (MAPC), However, as the byproduct of the reaction forming struvite, ammonium gas would generate an unpleasant odor, leading to attempts to replace ADP by potassium dihydrogen phosphate(KDP), The KDP based MPC can be termed as magnesium potassium phosphate cement(MKPC). The properties of magnesium potassium phosphate cement (MKPC) mortars with different potassium phosphate to magnesia (KDP/MgO) weight ratios and water to binder (W/B) weight ratios have been investigated. The experimental results show that both KDP/MgO and W/B ratios have large influence on the setting time and mechanical properties of MKPC mortars. Therefore, the formulation has to be optimized in terms of the workability, performance, as well as cost consideration.
Struvite
Ammonium dihydrogen phosphate
Potassium phosphate
Magnesium phosphate
Ammonium phosphate
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Although being an old concern, phosphate analysis is still a tremendous challenge. While many different experimental techniques are found in the literature, very few use powder X-ray diffraction (PXRD) patterns for quantitative phase analysis of different phosphate types. Our measurements performed in four commercial samples of diammonium hydrogen phosphate ((NH 4 ) 2 HPO 4 ) (DAP) show the existence of phosphate contamination mixtures, such as ammonium dihydrogen phosphate (NH 4 H 2 PO 4 ) (ADP). The larger the amount of ADP, the larger the microstrain induced in the DAP phase, which impacts both the aggregation of the nanoparticles in solution and the final anticancer activity of the nanostructure. This study shows that PXRD is an excellent technique for quantitative phase analysis to determine the presence and amount of phosphate contamination in diammonium hydrogen phosphate samples.
Powder Diffraction
Ammonium dihydrogen phosphate
Hydrogen phosphate
Diammonium phosphate
Ammonium phosphate
Quantitative Analysis
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