Conversion of local industrial wastes into greener cement through geopolymer technology: A case study of high-magnesium nickel slag

Zhang, Zuhua; Zhu, Yingcan; Yang, Tao; Li, Liangfeng; Zhu, Huajun; Wang, Hao

doi:10.1016/j.jclepro.2016.09.147

Cited by 223 publications

(46 citation statements)

References 28 publications

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“…Comparing the 14 days compressive strength of the FA(80%)-GGBS(20%) based GP paste without HMNS (47.2 MPa), the use of 10% HMNS replacement to FA can increase the compressive strength by about 29%, which is highly significant. This improvement in strength is mainly due to the high contents of magnesium in the mixture, which plays a similar role to the calcium and produces a new hydrate gel called hydrotalcite-like phase or magnesium-bearing silicate hydrates (M-S-H or C-M-S-H) [20,24]. A report produced by Zhang et al [20] showed that the use of HMNS in FA-based GP concrete has a positive effect on the compressive strength of the mixture when its replacement is not over 60%.…”

Section: Gp Pastementioning

confidence: 99%

“…Therefore, there is a need to develop suitable alternatives to FA to promote commercialisation of GP concrete technology. Among many industrial by-products, ground granulated blast-furnace slag (GGBS) and high-magnesium nickel slag (HMNS) are the two materials which have been found to be able to improve the performance of resultant GP concrete when they are used to partially replace FA [19,20]. GGBS is a by-product obtained from iron industries when cooled and ground to the fineness of cement.…”

Section: Introductionmentioning

confidence: 99%

“…GGBS, therefore, sourced an additional amount of calcium and contributed to an additional binding product, which in turn affects the setting behaviour of geopolymer gel[30]. It is highly possible for the Mg 2+ which is sourced from the HMNS to contribute in the formation of new gel phase as Na-Al(Mg)-Si-H gel, as evidenced by the EDX analysis[20]. The micro-cracks observed in some of the SEM features probably occurred during the mechanical tests, since the powders tested for SEM were taken from the specimens after the mechanical tests.…”

mentioning

confidence: 99%

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Mechanical properties and microstructure analysis of FA-GGBS-HMNS based geopolymer concrete

Bouaissi

Abdullah

et al. 2019

Construction and Building Materials

168

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This paper presents an experimental investigation on the mechanical properties and microstructure of geopolymer concrete mixed using class F fly ash (FA), ground granulated blastfurnace slag (GGBS) and high-magnesium nickel slag (HMNS). An optimal combination of FA, GGBS and HMNS was determined using the compressive strength tests of geopolymer (GP) pastes mixed with various different replacements of FA with GGBS and/or HMNS. It was found that the replacement of FA with 20% of GGBS and 10% of HMNS in GP concrete increases the 28-day compressive strength by 100% and the 28-day splitting tensile strength by 58%. The microstructure analysis of the GP concrete using SEM, XRD, and FTIR showed the formation of aluminosilicate amorphous phase in a three-dimensional network. The SEM images revealed a fully compact and cohesive geopolymer matrix, which explains the reason why the mechanical properties of the FA based GP concrete with both GGBS and HMNS are improved.

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Section: Gp Pastementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Mechanical properties and microstructure analysis of FA-GGBS-HMNS based geopolymer concrete

Bouaissi

Abdullah

et al. 2019

Construction and Building Materials

168

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“…However, because of the physical and chemical characteristics of HMNS, such as low reactivity and poor wearability, the current utiliza-tion rate is not more than 10%, mainly used in cement, concrete and other building materials industries (Kumer and Kumar 2017;Hua et al 2016). Recently some studies have also tried to use HMNS as geopolymer (Zhang et al 2017). The remaining large amount of unused HMNS occupies a large amount of land, although nickel slag is generally considered to be harmless, it is still potentially hazardous to the underground water.…”

Section: Introductionmentioning

confidence: 99%

Study on Physical and Chemical Properties of High Magnesium Nickel Slag-Phosphogysum Composite Cementitious Materials in Different Particle Sizes

Wang

Zhang

et al. 2020

ACT

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High-magnesium nickel slag (HMNS) and phosphogypsum (PG) are hazardous industrial solid waste. The present work focuses on the feasibility of using the two materials as supplementary cementitious materials (SCM) added to cement. The slag and gypsum were ground into different specific surface area (2235 cm 2 /g, 3040 cm 2 /g and 3900 cm 2 /g), then mixed into ten different samples. The effect of SCM addition was detected by isothermal conduction calorimetry (ICC) testing, compressive strength, mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), scanning electron microscope (SEM) and linear shrinkage. The results showed that the HMNS-PG composite cementitious material with suitable specific surface area has relatively high activity, and a small amount of gel and alumina-ferric oxide-trisulfate (AFt or ettringite) are detected in HMNS-PG composite cementitious material. According to the results, the high-magnesium nickel slag could be together with phosphogypsum as substitutes for cement, improved the utilization rate of industrial waste and reduced environmental pollution.

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“…Nonferrous slags are an industrial by-product, most of which are treated by stacking or landfill. Since these smelting slags contain many heavy metals, such as copper, nickel, cobalt, and zinc, a large amount of industrial smelting slag accumulation or landfill not only occupies farmland and other lands, but it also seriously endangers the environment [1,2].…”

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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Conversion of local industrial wastes into greener cement through geopolymer technology: A case study of high-magnesium nickel slag

Cited by 223 publications

References 28 publications

Mechanical properties and microstructure analysis of FA-GGBS-HMNS based geopolymer concrete

Mechanical properties and microstructure analysis of FA-GGBS-HMNS based geopolymer concrete

Study on Physical and Chemical Properties of High Magnesium Nickel Slag-Phosphogysum Composite Cementitious Materials in Different Particle Sizes

Alkali Activation of Copper and Nickel Slag Composite Cementitious Materials

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