Factors that affect the properties of magnesium phosphate cement

Li, Yue; Chen, Bing

doi:10.1016/j.conbuildmat.2013.05.103

Cited by 259 publications

(63 citation statements)

References 14 publications

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“…hematite) [36] suggests that they do not take part in any secondary reactions. Recent work evaluating FA/MKPC binders [14] speculated the formation of an amorphous phase coating the FA particles, which was proposed to be a silicon-phosphate phase. This postulation was drawn from BSE micrographs and small differences in XRD reflections compared to a pure MKPC binder.…”

Section: Elemental Mapping -Fa/mkpcmentioning

confidence: 99%

“…Several studies [6,12,13] based on FA/MKPC blended binders have suggested that FA simply acts as a diluent or inert filler, that modifies the aesthetics of MKPC to be compatible to traditional Portland cement, which has been deemed important for rapid-repair applications [9]. Conversely, others hypothesise that FA replacement promotes high mechanical strength in FA/MKPC binders, as a consequence of the formation of a secondary amorphous phase containing silicon-phosphate bonds [12,14]. This is commensurate with the work of Wilson and Nicholson [1], who suggested that aluminosilicate glass can react with phosphoric acid to form a strong phosphate bonded cement.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Gardner

Bernal

Walling

et al. 2015

Cement and Concrete Research

250

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Magnesium potassium phosphate cements (MKPCs), blended with 50 wt.% fly ash (FA) or ground granulated blast furnace slag (GBFS) to reduce heat evolution, water demand and cost, were assessed using compressive strength, X-ray diffraction (XRD), scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) spectroscopy on 25 Mg, 27 Al, 29 Si, 31 P and 39 K nuclei. We present the first definitive evidence that dissolution of the glassy aluminosilicate phases of both FA and GBFS occurred under the pH conditions of MKPC. In addition to the main binder phase, struvite-K, an amorphous orthophosphate phase was detected in FA/MKPC and GBFS/MKPC systems. It was postulated that an aluminium phosphate phase was formed, however, no significant Al-O-P interactions were identified. High-field NMR analysis of the GBFS/MKPC system indicated the potential formation of a potassium-aluminosilicate phase. This study demonstrates the need for further research on these binders, as both FA and GBFS are generally regarded as inert fillers within MKPC.

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Section: Elemental Mapping -Fa/mkpcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Gardner

Bernal

Walling

et al. 2015

Cement and Concrete Research

250

View full text Add to dashboard Cite

show abstract

“…MPC mortar at other M/P had the similar results. To increase the setting time, partial replacement with fly ash, ground granulated blastfurnace slag, or aluminate cement would be alternative to chemical admixture [15][16][17][18][19]. Notwithstanding, the time to set seems still very short, ranging from 16.74 to 34.12 min.…”

Section: Mechanical Properties Of Mpcmentioning

confidence: 99%

Fundamental Properties of Magnesium Phosphate Cement Mortar for Rapid Repair of Concrete

Park

Kim

Ann

2016

Advances in Materials Science and Engineering

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Fundamental properties of magnesium phosphate cement (MPC) were investigated in this paper. The setting time and compressive and bond (i.e., flexural and tensile bond) strengths were measured to assess the applicability, and hydration product was detected by the X-ray diffraction. The specimens were manufactured with magnesia and potassium dihydrogen phosphate (K 2 HPO 4 ) was added to activate hydration process. The Borax (Na 2 B 4 O 7 ⋅10H 2 O) was used as a retarder to mitigate overwhelming rapid hardening. Mercury intrusion porosimetry was used to examine the pore structure of MPC mortar, and simultaneously rapid chloride penetration test was performed. As a result, the compressive strength of MPC mortar was mostly achieved within 12 hours; in particular, the MPC mortar at 4.0 of M/P ranked the highest value accounting for 30.0 MPa. When it comes to tensile and flexural bond to old substrate in mortar patching, the MPS had the higher tensile and flexural strengths, accounting for 1.9 and 1.7 MPa, respectively, compared to OPC mortar patching. Unlike Portland cement mortar, the MPC mortar contained mainly air void rather than capillary pores in the pore distribution. Presumably due to reduced capillary pore in the MPC, the MPC indicated lower penetrability in the chloride penetration test.

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“…MPC has excellent mechanical properties in high early strength, ability to set and harden at temperatures as low as −20°C, high bond strength, small shrinkage, and good durability including chemical attack resistance, deicer scaling resistance, and permeation resistance [8,9]. Phosphate salts, such as ammonium dihydrogen phosphate (NH 4 H 2 PO 4 ), potassium dihydrogen phosphate (KH 2 PO 4 ), and sodium dihydrogen phosphate (NaH 2 PO 4 ), were usually used to prepare MPC [10,11].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Steel Fiber-Reinforced Magnesium Phosphate Cement Mortar

Feng

Chen

Zhao

et al. 2018

Advances in Civil Engineering

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A new cement-based mortar with high early strength and toughness was developed by adding micro steel fibers (MSF) in magnesium phosphate cement (MPC) mortar. e compressive and flexural tests were carried out to investigate the effect of curing time, MSF volume fraction, sand-cement mass ratio, and water-cement mass ratio on the strength and flexural toughness of MSF-reinforced MPC mortar (MSFRMM). Also, the flexural toughness and ductility of MSFRMM were evaluated according to ASTM C1609. e results of this study showed that the addition of MSF from 0% to 1.6% by volume significantly improved the compressive strength of MSFRMM. e MSFRMM showed high early strength, especially during the first 3 days. e addition of MSFs changed the flexural failure mode of MPC-based mortar from brittleness to ductility, and the flexural toughness of MSFRMM remarkably increased with the increase of MSF volume fraction from 0% to 1.6%. e toughness and ductility of MSFRMM slightly increased with the increase of the dosage of cement. e toughness and ductility of MSFRMM increased with the decrease of the water-cement mass ratio due to the improved density of the mortar caused by the reduction of water.

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Factors that affect the properties of magnesium phosphate cement

Cited by 259 publications

References 14 publications

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Characterisation of magnesium potassium phosphate cements blended with fly ash and ground granulated blast furnace slag

Fundamental Properties of Magnesium Phosphate Cement Mortar for Rapid Repair of Concrete

Mechanical Properties of Steel Fiber-Reinforced Magnesium Phosphate Cement Mortar

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