Influence mechanisms of fly ash in magnesium ammonium phosphate cement
A novel magnesium-iron phosphate cement was prepared based on magnesium phosphate cement (MPC), by incorporating various proportions of Fe2O3 powder as MgO powder replacement.
Research progresses on magnesium phosphate cement: A …
Many studies [12], [45], [50], [51] have been reported that physical and mechanical properties of MPC based cementitious materials greatly affected by curing …
Study on the hydration process and borax retarding …
Magnesium ammonium phosphate cement (MAPC) is an inorganic cementing material with phosphate as the binding phase produced through chemical and physical interaction by using the raw materials of dead-burnt magnesium oxide, monoammonium phosphate and admixtures at a certain ratio [18,19,20,21,22].
Thermodynamic modeling of the effect of temperature on …
1. Introduction. Magnesium phosphate cements (MPCs), also known as chemically bonded phosphate cement/ceramics, are formed through an acid-base reaction between dead-burnt magnesia and soluble phosphate [1], [2].The commonly used soluble phosphates are NH 4 H 2 PO 4, KH 2 PO 4 and NaH 2 PO 4, and MPC prepared with …
Properties of magnesium phosphate cement reinforced …
1. Introduction. Magnesium phosphate cement (MPC) is a chemically bonded material that is typically formed via an acid-based reaction of dead-burned magnesium oxide, phosphate, and a retarder [1], [2], [3].Ammonium dihydrogen phosphate (NH 4 H 2 PO 4) has often been used as a source of phosphoric acid in the …
Preparation and characterization of a degradable magnesium phosphate
Introduction. Magnesium phosphate bone cement (MPBC) has attracted much attention in bone regeneration for its high initial strength, fast setting time and moderate degradation rate compared with calcium phosphate bone cement (CMPC) [].Traditional MPBC is mixed with dead burnt magnesium oxide (MgO) and ammonium …
Microstructure evolution of interface between magnesium ammonium
This paper reports the test results on the bonding strength between magnesium ammonium phosphate cement and Portland cement. The bonded specimens were prepared by immersion in Na2SO4 solution. Following immersion, the surfaces and positions of fractures on the specimens were examined. SEM and an optical microscope …
Retardation and reaction mechanisms of magnesium phosphate cement mixed
This paper reports the test results on the bonding strength between magnesium ammonium phosphate cement and Portland cement. The bonded specimens were prepared by immersion in Na2SO4 solution.
Optimization of mix proportion and strength prediction of …
In order to optimize the mix ratio design of magnesium phosphate cementitious composites (MPCC) to obtain excellent workability and strength, this study …
Static and dynamic mechanical properties of magnesium phosphate cement
DOI: 10.1016/j.conbuildmat.2023.131933 Corpus ID: 258995701; Static and dynamic mechanical properties of magnesium phosphate cement modified by metakaolin after high-temperature treatment
Influence mechanisms of fly ash in magnesium ammonium phosphate cement
1. Introduction. Magnesium phosphate cement (MPC) is a special cementitious material prepared by magnesia phosphate salt, chemical additive, and mineral admixture, which belongs to the magnesia cement and chemically bonded phosphate ceramics family [1], [2].The used magnesia is generally formed from high …
Properties and Reaction Mechanisms of Magnesium …
Magnesium Phosphate Cement (MAPC) has high early strength, good adaptability to temperature, low volume deformation, high cementation strength, and good resistance …
Retardation and reaction mechanisms of …
This study can provide theoretical basis for the engineering application of calcium phosphate cement. 2. Test 2.1 Raw materials and mixing ratio ... (H 2 O) 6 2+], which then reacted with NH 4 + and PO 4 3− in the …
Preparation and study of magnesium ammonium phosphate cement …
The formation of MPC is based on the acid-base reaction, when dead burned MgO reacts with the phosphate salts (NH 4 H 2 PO4: ADP or KH 2 PO 4:KDP) in the presence of water to form the Magnesium ammonium phosphate cement (MAPC) or magnesium potassium phosphate cement (MKPC). MPCs show superior performance …
Thermodynamic mechanisms on the effects of mix …
Semantic Scholar extracted view of "Thermodynamic mechanisms on the effects of mix proportion, and type and dosage of chemical modifier on phase assemblage of magnesium oxysulfate cement" by Tong Li et al. ... Thermodynamic modeling of the effect of temperature on the phase assemblage of magnesium ammonium phosphate cement. …
EFFECT OF CARBONISATION ON THE MECHANICAL …
and a magnesium ammonium phosphate cement-fly ash composite system in a carbonisation environment. At the same time, through a micro-analysis, the mechanism …
Thermodynamic modeling of the effect of temperature on …
The commonly used soluble phosphates are NH 4 H 2 PO 4, KH 2 PO 4 and NaH 2 PO 4, and MPC prepared with these phosphates is called magnesium ammonium phosphate cement, magnesium potassium phosphate cement (MKPC) and magnesium sodium phosphate cement (MNaPC), respectively. MAPC and MKPC are two …
Study on anti-corrosion performance of composite modified magnesium …
This paper aims to improve the corrosion protection properties of magnesium ammonium phosphate cement-based coatings. Zinc oxide and aluminum tripolyphosphate were used as additives at 3% and 4% by mass of magnesium oxide. ... SEM and XRD/TG-DTG measurements. Comparing the anodic slope B a of the …
Research progress on the properties and applications of magnesium …
Magnesium phosphate cement (MPC) is a new cementing material with great development potential and excellent properties. In addition to traditional cement, MPC also has the characteristics of ceramics, refractory materials, and biological materials.The MPC materials can be applied especially in architecture and other fields such as wall …
Role of Fly Ash in the Repair Interface between Magnesium Phosphate
This paper examines a rapid repair material for cement concrete pavement based on magnesium phosphate cement (MPC) blended with fly ash (FA). ... Properties and Water Resistance of Magnesium–Ammonium Phosphate Cement. Journal of Materials in Civil ... and Hydrates of Seawater-Mixed Magnesium Potassium …
Thermodynamic modeling of magnesium ammonium phosphate cement …
Magnesium ammonium phosphate cement (MAPC) is commonly applied as a repair material. However, its hydration mechanism remains unclear. A thermodynamic modeling approach is employed to explore the hydration mechanism of MAPC. The results reveal that the hydration products of MAPC include (NH 4) 2 Mg(PO 4) 2 ·4H 2 O, …
Properties and Reaction Mechanisms of Magnesium Phosphate Cement Mixed
Magnesium phosphate cement (MPC) is a water-hardening inorganic cementitious material [1,2,3]. Compared with the conventional Portland cement, MPC has different chemical reaction, product, and performance. ... MPC, it was believed that a similar effect or better improvement can be achieved when the high alkaline aluminoferrite …
Influence mechanisms of fly ash in magnesium ammonium phosphate cement
Rheological properties play a crucial role in determining the grouting effectiveness of magnesium phosphate cement (MPC) slurry. This study aims to investigate the effects of the magnesia-to-phosphate (M/P) ratio, water-to-cement (w/c) ratio, fly ash (FA), and metakaolin (MK) on the rheological properties of seawater-mixed …
Evaluation of mechanical and microscopic properties of magnesium …
Currently, the most commonly used phosphates are ammonium dihydrogen phosphate and potassium dihydrogen phosphate. Cement prepared with ammonium dihydrogen phosphate is defined as magnesium ammonium phosphate cement (MAPC). Some studies have shown [11,12] that MAPC is characterized by concentrated …
Effect of fly ash and metakaolin on the mechanical …
The main constituents utilized in the experiment included magnesium phosphate cement (MPC), fly ash (FA), and metakaolin (MK). The raw materials for MPC consisted of dead-burned magnesium oxide (MgO) with a density of 3.25 g/cm 3 and a specific surface area of 280 m 2 /kg. Ammonium dihydrogen phosphate (ADP) with a …
Thermodynamic modeling of magnesium ammonium phosphate cement and
Magnesium ammonium phosphate cement (MAPC), which is one type of MPC, was first patented by Prosen [4] in 1936 as a binder material to produce dental casting investment materials by mixing MgO with ammonium phosphate. MAPC can release noxious gaseous ammonia during the hardening process, which impedes its …
Retardation and reaction mechanisms of magnesium phosphate cement mixed
Retardation and reaction mechanisms of magnesium phosphate cement mixed with glacial acetic acid L. Jun, J. Yong-sheng, H. Guodong and J. Cheng, RSC Adv., 2017, 7, 46852 DOI: 10.1039/C7RA08383A This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in …
EFFECT OF CARBONISATION ON THE MECHANICAL …
Keywords: Magnesium Ammonium Phosphate Cement, Fly Ash, Carbonisation, Mechanical Property, Hydration ... Mix proportion of the magnesium phosphate cement (wt. %). NO. Ammonium Over-fired Borax Fly ash dihydrogen magnesia phosphate P1 70.523.56.0/ P2 60.020.06.014
Injectability analysis of seawater-mixed magnesium phosphate cement
The results revealed that the mass ratio of borax to magnesium (B/M) and magnesium to ammonium dihydrogen phosphate (M/ADP) plays a vital role in the setting time of seawater-mixed MPC slurries. Considering the hydration and rheological behavior of seawater-mixed MPC slurries, an optimal formulation is proposed, which incorporates …
Experimental Study on Properties of Magnesium Phosphate …
Twenty-one mix proportions of MPC-based concrete were mixed with investigating the effect of aggregate cement ratios (𝐴 / 𝑐), mass ratios of fine aggregate to …
Retardation and reaction mechanisms of …
Magnesium phosphate cement (MPC) is a new type of phosphate repair material with early strength and super rapid hardening ability. Compared with Portland cement, MPC has advantages such as rapid low …
Investigation of magnesium phosphate cement on river …
MPC is composed of magnesium oxide (MgO), phosphate salt (KH 2 PO 4 or NH 4 H 2 PO 4) and retarders mixed in a specific proportion. After adding water to these compounds, highly crystalline MPC is produced through an acid-base neutralization reaction. ... The chemical reaction of magnesium ammonium phosphate cement …
Properties and Reaction Mechanisms of Magnesium …
Magnesium phosphate cement (MPC) is a water-hardening inorganic cementitious material [ 1, 2, 3 ]. Compared with the conventional Portland cement, MPC …
An Overview of Magnesium-Phosphate-Based Cements as …
To partially overcome these limitations, in the last decade the attention of the scientific community has been directed towards magnesium-phosphate-based …
Effect of heavy metals and water content on the strength of magnesium …
When performing bending tests to prismatic specimens of magnesium ammonium phosphate cement a reduction of the strength was observed as the water-to-solid ratio (W/S) increased: ... cements obtained by mixing magnesium oxide with either phosphoric acid or an acidic phosphate. They include magnesium potassium …
Effect of fly ash and metakaolin on the mechanical …
To solve the current application problems of magnesium phosphate cement (MPC), this study investigates the working properties, hydration process, strength performance, bonding strength, and other characteristics of MPC with 10% to 40% substitution of fly ash (FA) and metakaolin (MK) using different mixing methods. Among …