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

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

doi:10.1016/j.cemconres.2015.01.015

Cited by 271 publications

(111 citation statements)

References 50 publications

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“…It can be observed that the fayalite and magnetite contents are almost constant in the four batches, while the amount of other compounds can significantly change. In particular, the amount of glaucochroite and calcium iron oxide decrease with increasing the maximum particle size of the powders whereas that of aluminum calcium oxide and periclase tend to increase in agreement with literature data [31]. The variability of the content of these compounds can affect workability as well as durability of the mortars with a negative effect on their performance.…”

Section: Resultssupporting

confidence: 78%

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

et al. 2017

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This paper deals with the production of mortars prepared using a commercial CEMIIB-S 42.5N cement, a natural aggregate, steelmaking slag, a superplasticizer and water. The as-received unprocessed steel slag was milled by a hammer mill and then sieved to obtain batches with different maximum particle size. Each batch was used, together with the other components, in the production of mortars which were tested, by compression and water absorption, after different aging times in order to evaluate their long term stability. Several slag-free samples were also prepared as reference materials. All mortars were prepared with fixed aggregate/cement ratio (6/1), superplasticizer/cement ratio (s/c) and water/cement ratio (w/c). It has been demonstrated that an adequate protocol for the preparation and the use of slag containing particles with 2500 µm maximum size lead to the production of materials with mechanical properties suitable for civil engineering applications after aging for 28, 90 and 180 days. However, samples containing slag particles with size equal or greater than 1000 µm display a decay of mechanical properties after longer aging in water or after accelerated aging.

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Section: Resultssupporting

confidence: 78%

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

et al. 2017

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“…4); again, no crystalline reflections were identified that could be associated with a dehydrated KMgPO 4 phase. As discussed above, it is postulated that KMgPO 4 is non-crystalline between 200 °C -700 °C [25][26][27] , as a result of dehydration of struvite-K. Diffuse scattering associated with the glassy slag fraction is reported between 24 , however the diffuse scattering in the 200 °C diffraction pattern was evident over a wider range (between ), suggesting that more than one amorphous phase could be present. The quartz identified at 200 °C is believed to be contamination from the cleaning media (sand) used during grinding.…”

Section: Omentioning

confidence: 98%

“…Backscattered electron micrographs of FA/MKPC and GBFS/MKPC binders are shown in for these binders as reported in the literature 12,24 . It was observed in both systems that the main binding phase, struvite-K, formed a continuous phase that was interspersed with embedded large struvite-K crystallites.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

“…This density difference between the supplementary cementitious materials (SCMs) could also explain the disparity observed in Figure 3, as the slightly denser GBFS would occupy a smaller volumetric contribution (in a 20 mg TG sample) than the FA and, as such, it would appear that additional struvite-K had formed in the GBFS/MKPC binder. The authors have recently reported that FA and GBFS do not behave as inert fillers within the MKPC system but rather that incongruent dissolution results in the formation of secondary reaction products 24 , which makes it difficult to accurately quantify the proportion of the volumetric composition.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Evolution of phase assemblage of blended magnesium potassium phosphate cement binders at 200° and 1000°C

Gardner

Lejeune

Corkhill

et al. 2015

Advances in Applied Ceramics

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The fire performance of magnesium potassium phosphate cement (MKPC) binders blended with fly ash (FA) and ground granulated blast furnace slag (GBFS) was investigated up to 1000 °C using XRD, TGA, and SEM techniques. The FA/MKPC and GBFS/MKPC binders dehydrate above 200 °C to form amorphous KMgPO 4 , concurrent with volumetric and mass changes. Above 1000 °C, additional crystalline phases were formed and microstructural changes occurred, although no cracking or spalling of the samples was observed. These results indicate that FA/MKPC and GBFS/MKPC binders are expected to have satisfactory fire performance under the fire scenario conditions relevant to the operation of a UK or other geological disposal facility.

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“…e major component of FGD gypsum is calcium sulphate dihydrate. At present, these industrial wastes are primarily utilised for the production of cement [1,2], concrete [3][4][5][6][7], geopolymers [8][9][10], and cementitious materials for mine filling [11,12]. For example, Ma et al [13] prepared sulphoaluminate cement that was capable of meeting special structural requirements from fly ash and FGD gypsum.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Experimental Studies on Preparation of Mine‐Filling Materials from Carbide Slag, Granulated Blast‐Furnace Slag, Fly Ash, and Flue‐Gas Desulphurisation Gypsum

Zhang

et al. 2018

Advances in Materials Science and Engineering

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Environmentally friendly and cheap composite green cementitious materials have been prepared from carbide slag, fly ash, fluegas desulphurisation (FGD) gypsum, and granulated blast-furnace slag (GBFS) without using cement clinker. Orthogonal testing was used to investigate the effects of the raw materials on the amount of water required for reaching standard consistency and consistency, setting time, slump value, and strength of the produced materials after curing for 7 d and 28 d. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the analysis of the sample microstructure and hydration products as well as for the exploration of possible hydration mechanisms. We found that, among the utilised raw materials, the addition of FGD gypsum had the most significant effect on the setting time and amount of water required for reaching standard consistency and consistency, while the addition of GBFS deeply affected the slump value. e optimal activation results were obtained when the mass ratio of carbide slag : fly ash : GBFS : FGD gypsum was equal to 12

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

Cited by 271 publications

References 50 publications

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

Production and Compression Strength of Mortars Containing Unprocessed Waste Powdered Steel Slag

Evolution of phase assemblage of blended magnesium potassium phosphate cement binders at 200° and 1000°C

Orthogonal Experimental Studies on Preparation of Mine‐Filling Materials from Carbide Slag, Granulated Blast‐Furnace Slag, Fly Ash, and Flue‐Gas Desulphurisation Gypsum

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