Property Study on Complex with Phosphate and Magnesium Phosphate Cement
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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.Keywords:
Magnesium phosphate
Ammonium dihydrogen phosphate
Potassium phosphate
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Magnesium phosphate
Anhydrous
Potassium phosphate
Efflorescence
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Potassium phosphate
Molar ratio
Magnesium 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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The physical and chemical properties of tetracalcium phosphate(TTCP)-Monocalcium phosphate monohydrate(MCPM)-β-Tricalaium phosphate(β-TCP) based bone cement are studied using simulated body fluid(SBF) as a chemical liquid.The results show that the compressive strength increases at first and then decreases with the increasing of liquid-solid ratio.When the liquid-solid ratio is 0.445,it can reach the maximum strength(15.23 MPa).The setting reaction of CPC is rapid.When the liquid-solid ratio is 0.594,the final time is 12 minites.The compressive strength gradually decreases with the increasing of soaking time.The obtained bone cements are characterized by XRD and SEM.The results find the occurrence of hydroxyapatite(HA) in all obtained crystals of setting reaction.However,there is no new crystal phase generated after soaking.
Monocalcium phosphate
Simulated body fluid
Bone cement
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Salt lake magnesium phosphate cement (SLMKPC) was prepared by mixing potassium dihydrogen phosphate (KH2PO4) with lithium-extracted magnesium residue (MR). The hydration-hardening process and the variation in the phase composition and microstructure of hydration products with the change of the water-cement-ratio (W/C) were studied by measuring the setting time, hydration exothermic temperature, and compressive strength of the hardened slurry. It was found that W/C ratios had significant effects on the setting time, hydration exothermal temperature curve, and compressive strength of SLMKPC. With the increase of W/C, the setting time was prolonged significantly. The exothermic hydration peak temperature first increased and then decreased, and the number of exothermic peaks gradually changed from one to two. The optimal compressive strength was obtained when W/C = 0.2–0.3. Hydration products changed significantly with the increase of W/C, the MgKPO4·6H2O (MKP) in the matrix was more stable when W/C = 0.2 and 0.3 than when W/C = 0.25, 0.35, and 0.4. When W/C = 0.3, SLMKPC had a compact structure with a certain operating space and better mechanical properties.
Magnesium phosphate
Potassium phosphate
Exothermic reaction
Hydration reaction
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Setting liquids of different pH values were prepared by mixing of sodium phosphate dibasic dedocahydrate(SPDD,Na_2HPO_4·12H_2O) and/or citric acid.α-Tricalcium phosphate(α-TCP) was prepared by calcining β-tricalcium phosphate,and tetracalcium phosphate(TeCP) was obtained by calcining the mixture of dicalcium phosphate dihydrate and calcium carbonate with equal molar.The ratio of setting liquid to solid phase(L/P) in the bone cements changed from 0.25 to 0.45 mL/g.The compressive strength and porosity of the cement were measured.The effects of L/P and liquid composition on compressive strength of calcium phosphate were investigated.The results show that the compressive strength increases with the decreasing of pH value.There is a premium L/P in which the compressive strength gains its maxim.The compressive strength reached 21.69 MPa at the condition of L/P=0.30 mL/g and pH=5.
Dibasic acid
Bone cement
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A novel magnesium phosphate cement made from magnesia and potassium phosphate was studied. The objective of the study was to examine the basic characteristics and cementing mechanism of the cement. The effect of magnesia content on setting time, temperature rise during initial reaction and strength development of the cement mortar were examined. The reaction products of cement with water, and cementing structure were also examined. The results show that the cement was rapid setting and had high early strength. With the increase of magnesia content, the setting time of cement became shorter and the temperature rose higher during initial reaction. Compressive strength was also increased with increasing magnesia content. The microstructure of the hardened cement was studied by X-ray diffraction and scanning electron microscopy–energy dispersive spectroscopy. The reaction product in the cement is magnesium potassium phosphate hexhydrate (MgKPO 4 ·6H 2 O-MKP).
Magnesium phosphate
Potassium phosphate
Hydration reaction
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Potassium phosphate
Struvite
Magnesium phosphate
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Magnesium phosphate cement (MKPC) is a useful by product from the extraction of lithium from salt lake brine (MS) and potassium dihydrogen phosphate(KH2PO4). The effects of roasting temperature, ratio, water-cement ratio and fly ash on the performance of magnesium phosphate cement were studied. The application of potassium magnesium phosphate cement in concrete repair and reinforcement in combination with carbon fiber cloth as a concrete reinforcement were also studied. Experimental results show that when the calcination temperature is at 1100°C, the calcination time is 1 hour, & when the mass ratio of magnesium oxide to potassium dihydrogen phosphate is 2:1, water-cement ratio is 0.2, and fly ash is 30%, the carbon fiber cloth improves the concrete beam's load carrying capacity, flexural strength, as well as delay the appearance of concrete cracks and extension.
Magnesium phosphate
Potassium phosphate
Brine
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Borax
Ammonium dihydrogen phosphate
Magnesium phosphate
Diammonium phosphate
Phosphoric acid
Struvite
Fineness
Ammonium phosphate
Potassium phosphate
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