Re-examining the suitability of high magnesium nickel slag as precursors for alkali-activated materials

Yang, Tao; Zhang, Zuhua; Zhu, Huajun; Gao, Xuesong; Dai, Chengdong; Wu, Qisheng

doi:10.1016/j.conbuildmat.2019.04.063

Cited by 51 publications

(3 citation statements)

References 51 publications

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“…Brucite is a common mineral present in industrial aluminosilicate precursors used in the production of AACs, such as high-magnesium and high-nickel slag and, to a lower extent, natural clays (e.g., bentonite). Brucite can also form as a result of alkali-activation, since it is thermodynamically favorable to form under Al-deficient conditions that can exist during slag activation [18][19][20]. Hence, due to its common presence in AACs and its solubility at low pH (i.e., acidic) conditions, it is important to understand the effect of brucite-and Mg +2 specifically-on the acid resistance of AACs.…”

Section: Introductionmentioning

confidence: 99%

Sulfuric acid degradation of alkali-activated metakaolin cements supplemented with brucite

Gevaudan

Craun

Srubar

2021

Cement and Concrete Composites

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Section: Introductionmentioning

confidence: 99%

Sulfuric acid degradation of alkali-activated metakaolin cements supplemented with brucite

Gevaudan

Craun

Srubar

2021

Cement and Concrete Composites

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“…Various types of SCMs, including industrial byproducts of fly ash, blast furnace slag and other metallurgical slags, have been used in concrete production for many years [ 10 , 11 , 12 , 13 ]. Although the industrial byproducts are commonly regarded as promising green SCMs, the inconsistent property of industrial byproducts is still one of the critical issues to be faced in large-scale deployment [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Strengths, Microstructure and Nanomechanical Properties of Concrete Containing High Volume of Zeolite Powder

Yang

Zhan

et al. 2020

Materials

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In order to save resources and reduce the carbon footprint of concrete, the addition of high volumes of supplementary cementitious materials (SCMs) to replace cement is one of the most effective and promising methods. Zeolite powder (ZP), with a high specific surface area, exhibits high pozzolanic reactivity in cement-based materials. This paper investigates the effects of ZP addition used to replace cement at the levels of 20%, 40% and 60% on the strength development and microstructure evolution of concrete, and the nanomechanical properties are analyzed using nanoindentation technique. The results show that the replacement of ZP for cement generally has a dilution effect on the concrete, leading to a detrimental effect on the strength development. However, the 20% ZP replacement for cement slightly enhances the 90-day compressive strength. The pore structure analysis shows that the sample with 20% ZP content has a lower total porosity than the control sample. The hydration of ZP goes against the dilution effect and reduces the total porosity of concrete to compact the microstructure. Nanoindentation investigation of the matrix shows that 20% ZP decreases the content of portlandite but increases the content of high density calcium silicate hydrate (C-S-H). This is beneficial for improving the nanomechanical properties of interface transition zone. However, further increases in the content of ZP (40% and 60%) decrease the total volume of C-S-H and increase the porosity to degrade the microstructure.

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“…To reduce the cost of nickel production, molten tailings are poured directly in the factory, and the tailings are slowly cooled by air. Therefore, the content of the glass phase in nickel slag is low, and its activity is poor, which leads to the low utilization rate (only 8%) of nickel slag [11,12].…”

Section: Introductionmentioning

confidence: 99%

Alkali Activation of Copper and Nickel Slag Composite Cementitious Materials

Zhang

Zhi

et al. 2020

Materials

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Alkali-activated copper and nickel slag cementitious materials (ACNCMs) are composite cementitious materials with CNS (copper and nickel slag) as the main materials and GGBFS (ground-granulated blast-furnace slag) as a mineral admixture. In this paper, the activity indexes of CNS with different grinding times were studied using CNS to replace a portion of cement. NaOH, Na2SO4, and Na2SiO3 activators were used to study the alkaline solution of the CNS glass phase. The effects of the fineness of CNS and the type of activator on the hydration of ACNCMs were investigated via physical/mechanical grinding and chemical activation. The hydration products of ACNCMs were analyzed via XRD, SEM, FT-IR, TG, and MIP. The results of the study revealed that the activity indexes of CNS ground with different grinding times (10, 30 and 50 min) were 0.662, 0.689, and 0.703, respectively. When Na2SiO3 was used as the activator, the glass phase dissolved the most Si4+, Al3+, and Ca2+, and the respective concentrations in the solution were found to be 2419, 39.55, and 3.38 mg/L. Additionally, the hydration products of ACNCMs were found to have a 28-day compressive strength of up to 84 MPa.

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Re-examining the suitability of high magnesium nickel slag as precursors for alkali-activated materials

Cited by 51 publications

References 51 publications

Sulfuric acid degradation of alkali-activated metakaolin cements supplemented with brucite

Sulfuric acid degradation of alkali-activated metakaolin cements supplemented with brucite

Strengths, Microstructure and Nanomechanical Properties of Concrete Containing High Volume of Zeolite Powder

Alkali Activation of Copper and Nickel Slag Composite Cementitious Materials

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