scholarly journals Retardation and reaction mechanisms of magnesium phosphate cement mixed with glacial acetic acid

RSC Advances ◽  
2017 ◽  
Vol 7 (74) ◽  
pp. 46852-46857 ◽  
Author(s):  
Li Jun ◽  
Ji Yong-sheng ◽  
Huang Guodong ◽  
Jin Cheng
Keyword(s):  
Compressive Strength ◽  
Acetic Acid ◽  
Reaction Mechanisms ◽  
Glacial Acetic Acid ◽  
Setting Time ◽  
Magnesium Phosphate

This study aims to investigate the effect of admixture glacial acetic acid on the setting time, compressive strength, and hydration temperature of magnesium phosphate cement.

Effect of Metakaolin on Geopolymer Industry

2019 ◽  
pp. 49-70
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Flexural Strength ◽  
Reaction Mechanisms ◽  
Ordinary Portland Cement ◽  
Setting Time ◽  
Experimental Studies ◽  
Acid Attack ◽  
Repair Materials ◽  
Hardened State

This chapter discusses the effects of metakaolin (MK) on geopolymer mortar and concrete industries. The research topics of MK-based geopolymer cover reaction mechanisms and kinetics. This chapter aims at augmenting knowledge about enhancing mechanical properties of geopolymer mortars/concrete using MK. Specifically, this chapter presents literature studies as well as current experimental studies which delineate the effect of MK on fresh and hardened-state properties of geopolymer mortars (GPMs). Properties and characteristics of metakaolin are explained followed by properties of fresh MK mortars. Properties of hardened MK concrete and durability aspects of MK mortars are explained. Applications of MK-based geopolymers and metakaolin-based geopolymers as repair materials are also included in this chapter. The results of using MK-based GPMs revealed improved workability, enhanced setting time, increased density, higher compressive strength, flexural strength, and resistance against acid attack than conventional ordinary portland cement mortar/concrete.

Effect of Borax on Properties of Potassium Magnesium Phosphate Cement

2018 ◽  
Vol 914 ◽  
pp. 160-167
Author(s):  
Jin Bao Wen ◽  
Li Xia Zhang ◽  
Xiu Sheng Tang ◽  
Guo Hong Huang ◽  
Ye Ran Zhu
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Ph Value ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Time Dependent ◽  
Magnesium Phosphate ◽  
Dependent Effect ◽  
Time Dependent Effect ◽  
Potassium Magnesium

The effects of borax on the setting time, compressive strength, bond strength, drying shrinkage and pH value were investigated for potassium magnesium phosphate cement (MKPC). The results show that with the increase of borax dosage, the setting time is gradually extended, both compressive strength and bond strength are greatly decreased, the drying shrinkage rate is increased. Especially high dosage of borax, the extension of setting time is more obvious. Compared with that without borax, when the dosage of borax is 12.5%, setting time can be prolonged by 214.8%.The influence of borax dosage on the time-dependent effect of compressive strength shows that when the dosage of borax is 2.5%~5.0%, compressive strength increases rapidly from 4h to 1d, and increases relatively slowly from 1d to 3d. When borax dosage is less than 2.5% or higher than 5%, the law of time-dependent effect of compressive strength is the opposite. Compared to borax prior to magnesia addition, the pH value of the system is larger and the time of inflection point is advanced when borax and magnesia are mixed together at the same time. The increase of borax dosage can reduce the pH value of the system, and decrease the rising rate of pH value, at the same time the required time when the final pH value is relatively stable is longer.

Properties and reaction mechanisms of magnesium phosphate cement mixed with acetic acid

2017 ◽  
Vol 22 (1) ◽  
pp. 231-235 ◽  
Author(s):  
Jun Li ◽  
Yong-sheng Ji ◽  
Guo-dong Huang ◽  
Zhan-zhan Xu ◽  
Gui-hong Yan
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanisms ◽  
Magnesium Phosphate

scholarly journals Experimental Drillable Magnesium Phosphate Cement Is a Promising Alternative to Conventional Bone Cements

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1925
Author(s):  
Philipp Heilig ◽  
Phoebe Sandner ◽  
Martin Cornelius Jordan ◽  
Rafael Gregor Jakubietz ◽  
Rainer Heribert Meffert ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Phytic Acid ◽  
Mechanical Performance ◽  
Setting Time ◽  
High Strength ◽  
Magnesium Phosphate ◽  
Bone Cements ◽  
Promising Alternative ◽  
Phytic Acid Content ◽  
With Screws

Clinically used mineral bone cements lack high strength values, absorbability and drillability. Therefore, magnesium phosphate cements have recently received increasing attention as they unify a high mechanical performance with presumed degradation in vivo. To obtain a drillable cement formulation, farringtonite (Mg3(PO4)2) and magnesium oxide (MgO) were modified with the setting retardant phytic acid (C6H18O24P6). In a pre-testing series, 13 different compositions of magnesium phosphate cements were analyzed concentrating on the clinical demands for application. Of these 13 composites, two cement formulations with different phytic acid content (22.5 wt% and 25 wt%) were identified to meet clinical demands. Both formulations were evaluated in terms of setting time, injectability, compressive strength, screw pullout tests and biomechanical tests in a clinically relevant fracture model. The cements were used as bone filler of a metaphyseal bone defect alone, and in combination with screws drilled through the cement. Both formulations achieved a setting time of 5 min 30 s and an injectability of 100%. Compressive strength was shown to be ~12–13 MPa and the overall displacement of the reduced fracture was <2 mm with and without screws. Maximum load until reduced fracture failure was ~2600 N for the cements only and ~3800 N for the combination with screws. Two new compositions of magnesium phosphate cements revealed high strength in clinically relevant biomechanical test set-ups and add clinically desired characteristics to its strength such as injectability and drillability.

Effect of Magnesium to Phosphorus Ratio on Properties of Magnesium Phosphate Cement

2019 ◽  
Vol 807 ◽  
pp. 94-100
Author(s):  
Jin Bao Wen ◽  
Xiu Sheng Tang ◽  
Zhi Feng Xu ◽  
Ye Ran Zhu
Keyword(s):  
Compressive Strength ◽  
Bond Strength ◽  
Inflection Point ◽  
Ph Value ◽  
Setting Time ◽  
Drying Shrinkage ◽  
Shrinkage Rate ◽  
Magnesium Phosphate ◽  
Consistent Effect

The effects of the ratio of magnesium to phosphorus (Mg/P) on the compressive strength, bond strength, drying shrinkage and pH value of magnesium phosphate cement (MPC) were investigated. The results show that the consistent effect of the ratio of Mg/P on compressive strength and bond strength, as the ratio increases, the strengths are both first increased and then decreased, and the best ratio is 3:1. For setting time and drying shrinkage, the effects of the ratio of Mg/P are both obvious. Mainly manifested as the increase of the ratio, all of them show a decreasing trend. And the setting time can be shortened by 78%, furthermore, 28d the maximum drying shrinkage rate can be reduced by 29%. The effect of the ratio of Mg/P on pH value is mainly that when the ratio increases, the time of the inflection point of pH value is obviously advanced, and their final pH value is close.

scholarly journals Effects of mesoporous calcium magnesium silicate on setting time, compressive strength, apatite formation, degradability and cell behavior to magnesium phosphate based bone cements

RSC Advances ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 870-879 ◽  
Author(s):  
Liehu Cao ◽  
Weizong Weng ◽  
Xiao Chen ◽  
Jun Zhang ◽  
Qirong Zhou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Setting Time ◽  
Magnesium Silicate ◽  
Magnesium Phosphate ◽  
Cell Behavior ◽  
Bone Cements ◽  
Apatite Formation ◽  
Calcium Magnesium ◽  
Composite Cements

Mesoporous calcium magnesium silicate was doped into magnesium phosphate to fabricate magnesium phosphate based composite cements (MBC).

Experimental Research on the Properties of Modified MPC

2012 ◽  
Vol 450-451 ◽  
pp. 796-799 ◽  
Author(s):  
Bing Chen ◽  
Xin Yuan Yang ◽  
Ning Liu
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Experimental Research ◽  
Water Resistance ◽  
Setting Time ◽  
Experimental Results ◽  
Magnesium Phosphate

Magnesium phosphate cement (MPC) was modified by fly ash, silica fume and re-dispersible latex powder and the properties of modified MPC, such as fluidity, setting time and compressive strength, were tested. Based on the experimental results, the contents of 50% fly ash, 10% silica fume and 2% re-dispersible latex powder were chosen to modify MPC and the water resistance of the modified MPC was studied. The experimental results showed that the addition of fly ash prolonged the setting time and significantly increased the compressive strength of MPC. The addition of silica fume improved only the water resistance of MPC. The addition of the re-dispersible latex powder prolonged the setting time and improved the water resistance of MPC.

Study on Preparation and Mechanical Properties of Magnesium Phosphate Cement

2014 ◽  
Vol 1049-1050 ◽  
pp. 416-421
Author(s):  
Run Qing Liu ◽  
Ding Qiang Chen ◽  
Tian Bo Hou
Keyword(s):  
Compressive Strength ◽  
Flexural Strength ◽  
Orthogonal Experiment ◽  
Setting Time ◽  
Comprehensive Analysis ◽  
Magnesium Phosphate ◽  
Adhesive Properties ◽  
Rapid Repair ◽  
Experiment Method ◽  
Orthogonal Experiment Method

The orthogonal experiment method is utilized in this paper to get a comprehensive analysis of the compressive strength of magnesium phosphate cement (MPC) to prepare the cement with the best performance. What’s more, a further study is conducted on the compressive strength of paste and the compressive strength and the flexural strength of mortar, and the last is the adhesive properties. The results showed that the optimal ratio was obtained; the setting time of the optimum mix ratio of cement is 13min, which meets the requirements of rapid repair; the development of the strength of the paste and mortar all have the characteristics of early strength and fast hardening. Generally, the strength at 7d can reach the 90% of the strength at 28d, and the compressive strength of the paste at 28d can reach to 79.8MPa. The compressive strength and flexural strength of mortar at 28d are 53.2MPa and 11.3MPa, respectively.

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