Synthesis of calcium silicate hydrate based on steel slag with various alkalinities

Wang, Shuping; Peng, Xiaoqin; Geng, Jianqiang; Li, Bin; Wang, Kaiyu

doi:10.1007/s11595-014-0998-0

Cited by 18 publications

(9 citation statements)

References 13 publications

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“…The figure shows that 3411 cm −1 is the characteristic peak of –OH asymmetric stretching vibration in crystal water 41 . At 1440 cm −1 , the characteristic peak of

{CO}_{3}^{2 -}

is observed, indicating the existence of carbonate in IT 42 . The –CH 2 stretching vibration peak appears at 2920 cm −1 in FTIR spectra of MIT, suggesting the successful reaction between KH550 and IT.…”

Section: Resultsmentioning

confidence: 94%

“…41 At 1440 cm À1 , the characteristic peak of CO 2 -3 is observed, indicating the existence of carbonate in IT. 42 The -CH 2 stretching vibration peak appears at 2920 cm À1 in FTIR spectra of MIT, suggesting the successful reaction between KH550 and IT. At the same time, the stretching vibration of Si-O-Si appears at 1008 cm À1 with the stretching vibration of Si-OH at 760 cm À1 and the bending vibration of Si-O at 462 cm À1 , which are significantly strengthened in FTIR spectra of MIT, 43 indicating the successful modification of KH550 on IT.…”

Section: Characterization Of Modified Iron Tailings (Its)mentioning

confidence: 97%

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Thermoplastic polyurethane composites based on aluminum hypophosphite/modified iron tailings system with outstanding fire performance

Liu

Sun

et al. 2022

J of Applied Polymer Sci

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Iron tailings (IT) is the remaining industrial solid waste after beneficiation. The accumulation of billion tons of tailings not only occupies valuable land resources but also causes serious environmental pollution and human harm. This work aims to explore the potential application of IT in flame retardant field. The modified iron tailings (MIT) were combined with aluminum hypophosphite (AHP) to prepare a series of TPU/AHP/MIT composites by melt blending method. Thermogravimetric (TGA) test indicated that MIT and AHP significantly improved the thermal stability of the composites. The char residue of TPU/AHP22.5/MIT2.5 was enhanced to 29.60 wt% compared with 27.51 wt% of TPU/AHP25. Cone calorimetry test (CCT) confirmed that PHRR and THR of TPU/AHP15/MIT10 were decreased by 88.4% and 55.2% compared with those of pure TPU. Adding 2.5 wt% MIT could reduce the gas production of the TPU/AHP system by 32.82%. Scanning electron microscopy (SEM) and Raman spectroscopy tests confirmed that AHP/MIT system could increase the thickness and graphitization degree of char residue for the TPU composites, and thus increase the thermal stability and fire resistance of the composites. Lastly, the possible fire retarding mechanism of TPU/AHP/MIT composites was illustrated. This work provided a novel strategy for utilization of IT.

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“…The figure shows that 3411 cm −1 is the characteristic peak of –OH asymmetric stretching vibration in crystal water 41 . At 1440 cm −1 , the characteristic peak of

{CO}_{3}^{2 -}

Section: Resultsmentioning

confidence: 94%

Section: Characterization Of Modified Iron Tailings (Its)mentioning

confidence: 97%

Thermoplastic polyurethane composites based on aluminum hypophosphite/modified iron tailings system with outstanding fire performance

Liu

Sun

et al. 2022

J of Applied Polymer Sci

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“…The band at 3640 cm −1 is assigned to the stretching vibration of the hydroxyl group originated from the weakly absorbed water molecules on the slag surface 24 . The characteristic absorption bands at 1418, 861 and 710 cm −1 are ascribed to the asymmetric stretching mode and bending mode of carbonate group, respectively and the band at 980 cm −1 are attributable to the stretching vibrations of Si–O 25 . The band at 944 and 752 cm −1 represent the internal vibration of [SiO 4 ] 4− and [AlO 4 ] 5− tetrahedral and comes from Si (Al)–O-antisymmetric stretching vibration 26 .…”

Section: Resultsmentioning

confidence: 99%

Waste slag benefits for correction of soil acidity

Ghisman

Mureșan

Buruiană

et al. 2022

Sci Rep

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The global trend is to find new materials with improved environment friendly. The sustainable development of 2030 AGENDA and Waste Management Legislation sustain the disposal of a large quantity of slag at landfill sites by causing environmental consequences which has drawn attention to the need for its more effective recycling. Heavy industries have been operating in the Galati area for over 30 years and an ecological education is necessary for an efficient management of waste slag. The agricultural land resources are an issue world-wide and through this investigative study we showed that the mixture of blast furnace slag and waste slag dumped in landfill can help remediation of the soil acidity and increasing the crop yield. The chemical, structural and morphological properties of three investigated different slag samples are evaluated for recycling in agriculture. Results indicated that the obtained mixture of the slag waste dumped in landfill and of granulated metallurgical slag shows its usage in saving the affected lands. Therefore, by elemental analysis determined by X-ray fluorescence analytical equipment, the optimum weight ratio for the composition of soil-slag mixture were achieved. The obtained mixture presents a balance between soil pH = 5.2 corresponding to a medium acid soil and slag pH = 12.5 which corresponds as strongly basic character which is beneficial in amelioration process of acidic soils for the improving of soil characteristics.

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“…To date, a variety of methods, including mechanochemical [10][11][12], hydrothermal [13][14][15][16][17], sol-gel [11,[18][19][20], and chemical co-precipitation [21][22][23][24][25][26][27], were developed to synthesize C-S-H. Both the mechanochemical and the hydrothermal methods are referred to as pozzolanic reaction systems, which produce C-S-H by the chemical reaction between calcium hydroxide and silicon dioxide in the presence of water [7].…”

Section: Introductionmentioning

confidence: 99%

“…When the F value of the factor is greater than F 0.05(3,15), it means that the factor has a significant influence on the particle size of the synthesized C-S-H, which is represented by the symbol *.…”

mentioning

confidence: 99%

Investigation on Variables Contributing to the Synthesis of C-S-H/PCE Nanocomposites by Co-Precipitation Method

You

2021

Materials

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The usage of nanoscale calcium silicate hydrate (nano C-S-H) proved to have an excellent promotion effect on the early performance of concrete as nano C-S-H with ultra-fine particle size can act as seeding for cement hydration. Therefore, it is of importance to tune the particle size during the synthesis process of nano C-S-H. In this paper, the influence of several variables of the particle size distribution (PSD) of nano C-S-H synthesized by chemical co-precipitation method with the aid of polycarboxylate (PCE) was studied by orthogonal experimental design. In addition, the composition, microstructure, and morphology of the C-S-H/PCE nanocomposites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectrum. The results showed that the concentration of reactants had a significant impact on the PSD of C-S-H/PCE nanocomposites, followed by the dosage of dispersant. Ultrasonic treatment was effective in breaking the C-S-H/PCE aggregates with unstable agglomeration structures. The change in synthetic variables had a negligible effect on the composition of the C-S-H/PCE nanocomposites but had a significant influence on the crystallinity and morphology of the composites.

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Synthesis of calcium silicate hydrate based on steel slag with various alkalinities

Cited by 18 publications

References 13 publications

Thermoplastic polyurethane composites based on aluminum hypophosphite/modified iron tailings system with outstanding fire performance

Thermoplastic polyurethane composites based on aluminum hypophosphite/modified iron tailings system with outstanding fire performance

Waste slag benefits for correction of soil acidity

Investigation on Variables Contributing to the Synthesis of C-S-H/PCE Nanocomposites by Co-Precipitation Method

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