Temperature transformation of blended magnesium potassium phosphate cement binders

Gardner, Laura J.; Walling, Sam A.; Corkhill, Claire L.; Bernal, Susan A.; Lejeune, V.; Stennett, Martin C.; Provis, John L.; Hyatt, Neil C.

doi:10.1016/j.cemconres.2020.106332

Cited by 34 publications

(8 citation statements)

References 49 publications

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“…Pozzolans had undergone thermal reactions [52][53][54][55], which suggested that the high silica content of CSPW had led to the formation of secondary or additional CSHs, i.e. the pozzolanicilty of these additive materials have a common practice for improving the durability, resistivity and mechanical properties [56]. This was in a good agreement with the obtained results of physical properties as bulk density, porosity and water absorption as well as mechanical properties like flexural and compressive strengths.…”

Section: Compressive Strengthsupporting

confidence: 80%

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Darweesh

2023

JSMPM

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Resistance of Portland cement pastes incorporated 20 wt. % sanitary ware ceramic nano-powder wastes to firing temperatures from 100 up to 600 ℃ was investigated. Results revealed that all physical and mechanical properties were improved and gradually enhanced with firing temperatures, but only up to 400 ℃, and then adversely affected with any further increase of firing temperatures than 400 ℃, i.e. water absorption and total porosity decreased, whereas bulk density was enhanced. Water absorption and total porosity were decreased by 10 and 4 %, respectively, while bulk density was increased by 2.25 %. Furthermore, flexural and compressive strengths were also improved and increased by 1.69 and 1.2 %, respectively. Fourier transform infrared spectra (FT-IR) showed the disappearance of free lime and ettringite on firing. Scanning electron microscopy (SEM) showed that the crystal phase growth of the formed hydration products as a result of both normal hydration and pozzolanic reactions at ambient temperature were developed and modified due to the temperature exposure. The hardened cement pastes can withstand and resist only up to 400 ℃.

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Section: Compressive Strengthsupporting

confidence: 80%

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Darweesh

2023

JSMPM

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“…The preferred amount of fraction less than 0.063 mm in the composition for concrete, %: 30 (briquette 1) and 40 (briquette 2). Some modern researches were studied the effect of heat treatment on the properties of magnesium phosphate cements [20][21][22]. They were given the changes in the property indicators that similar to ours, but we cannot use them for comparison, since they additionally introduce other substances into the binder, for example, KH 2 PO 4 , ash or ammonium salts.…”

Section: Discussionmentioning

confidence: 97%

Refractory Concretes from Waste of Kovdor Mining and Processing Plant by Magnesium Phosphate Cement

Belogurova¹,

Саварина²,

Шарай³

2021

AJEP

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This work is aimed at using the technogenic raw materials of the Kovdorsky GOK for the production of refractory materials. Currently, many researchers are engaged in the development of technologies for unshaped materials. The most demanded among them are refractory concrete. They are able to set and harden at low temperatures with the formation of structures that retain their characteristics when heated. In our work, concretes were obtained from a briquette based on forsterite concentrate obtained from the waste of the Kovdorsky GOK. Magnesium phosphate cement was used as a binder. As a result of the research, the grain composition of the charge was selected, the ratio of filler and binder to improve the structural properties of concrete was found, the effects of the composition and the temperature of heat treatment of concretes on the physical and technical properties were shown. Concretes have the following characteristics: bulk density 2170-2260 kg / m 3 , strength up to 50 MPa (at 25°C), volume change after heat treatment at 450-1000°C 1-2%. Recovering the waste of the Kovdorsky GOK by manufacture of concrete will lead to a qualitatively new use of non-renewable natural resources, reduce the rate of depletion of mineral raw materials in the subsoil, eliminate sources of environmental pollution and restore land occupied by waste.

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“…In the field of orthopedics, they are promising materials for accelerating bone regeneration, including calcium phosphate, magnesium ammonium phosphate and the latest potassium magnesium phosphate [ 3 ]. Moreover, they can be used for the stabilization/solidification of radioactive metal cations because of their excellent immobilization effects, great encapsulation properties and excellent resistance to acid attack and high temperature [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Among various kinds of phosphate cements, magnesium potassium phosphate cement (MKPC) has drawn a great interest in research.…”

Section: Introductionmentioning

confidence: 99%

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

Leng,

Fu,

et al. 2024

Materials

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Magnesium potassium phosphate cement (MKPC) is formed on the basis of acid–base reaction between dead burnt MgO and KH2PO4 in aqueous solution with K-struvite as the main cementitious phase. Due to the unique characteristics of these cements, they are suitable for special applications, especially the immobilization of radioactive metal cations and road repair projects at low temperature. However, there are few articles about the hydration mechanism of MKPC. In this study, the types, proportions and formation mechanism of MKPC crystalline phases under different magnesium to phosphorus (Mg/P) ratios were studied by means of AAS, ICP-OES, SEM, EDS and XRD refinement methods. Corresponding MD simulation works were used to explain the hydration mechanism. This study highlights the fact that crystalline phases distribution of MKPC could be adjusted and controlled by different Mg/P ratios for the design of the MKPC, and the key factor is the kinetic of K+.

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Temperature transformation of blended magnesium potassium phosphate cement binders

Cited by 34 publications

References 49 publications

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Study on Portland Cement Pastes Containing Sanitary Ware Ceramic Wastes at Elevated Temperatures

Refractory Concretes from Waste of Kovdor Mining and Processing Plant by Magnesium Phosphate Cement

Effect of K+ Diffusion on Hydration of Magnesium Potassium Phosphate Cement with Different Mg/P Ratios: Experiments and Molecular Dynamics Simulation Calculations

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