Synergic effects of electrolytic manganese residue-red mud-carbide slag on the road base strength and durability properties

Zhang, Yuliang; Liu, Xiaoming; Xu, Yingtang; Tang, Binwen; Wang, Yaguang; Mukiza, Emile

doi:10.1016/j.conbuildmat.2019.06.009

Cited by 88 publications

(18 citation statements)

References 31 publications

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“…Table 10 shows that the hazardous metals Na, Cr, and Pb comply with the standard requirements. According to the previous research results [ 19 , 20 , 21 , 22 ], C-S-H gel, C-A-S-H gel, and ettringite produced in cementitious materials can effectively solidify Na and heavy metal ions. It can be seen from Table 10 that the heavy metal ions were not detected in the cementitious materials at 28 d, and the leaching concentration of Na in BRM-cement, CBRM-cement, and Tailings-cement is 47.261, 28.543, and 10.397 mg/L, respectively, which indicates that more active silicon and aluminum in Tailings are involved in the hydration reaction of cementitious materials, and the gel and ettringite can effectively solidify Na and heavy metal ions.…”

Section: Resultsmentioning

confidence: 97%

“…The MIP results are shown in Table 5 . It is generally believed that in cementitious materials, the pores that are larger than 1 um are harmful, and cementitious materials with fewer harmful pores have higher mechanical properties [ 18 , 19 , 20 , 21 , 22 ]. It is obvious that the Tailings-cement owns fewer harmful pores, and the CBRM-cement takes the second place.…”

Section: Resultsmentioning

confidence: 99%

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Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Wang

Liu

et al. 2021

Materials

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Bayer red mud (BRM) is a kind of solid waste with high hematite content, and its effective utilization is difficult due to the special physicochemical properties. In this work, Fe2O3 in BRM was reduced to Fe3O4 by biomass, and iron concentrate and high activity tailings were obtained after magnetic separation. The pozzolanic activity and hydration characteristics of the tailings were systematically studied. The results showed that the relatively stable polymerization structures of Si-O and Al-O in BRM are destroyed under the effect of biomass reduction at 650 °C, and some fracture bonds and activation points are formed in the structures. The aluminosilicate phases in the BRM were easy to transform into the active substances of Si and Al. The pozzolanic activity of tailings is greatly improved, and its pozzolanic activity index is 91%. High polymerization degree of gel and ettringite are formed since more active substances and alkali in the tailings promote the hydration reaction of cement-based cementitious materials, which made cementitious materials have dense matrix, good mechanical properties, and environmental performance. This work has realized the full quantitative utilization of BRM and provided a feasible way for the resource utilization of BRM.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Wang

Liu

et al. 2021

Materials

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“…Therefore, it has become a hot issue to explore the use of industrial waste residue as pavement base and subgrade lling materials in recent years. Zhang Y et al (2019) used electrolytic manganese residue, red mud and carbide slag as main raw materials to prepare the road base material, the mix was optimized and mechanical properties, durability, strength formation mechanism and environmental behavior were investigated. Using manganese slag as subgrade lling material can not only improve the utilization rate of manganese slag, but also solve the problems of manganese slag storage, land occupation and environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Study on Solidification Treatment of Electrolytic Manganese Slag and Numerical Simulation of Slope Stability

et al. 2021

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Manganese slag contains a large number of easily migrated heavy metals and ammonia nitrogen and other pollutants, which have a negative impact on the ecological environment. To verify the feasibility of manganese slag as highway subgrade material, manganese slag samples were solidi ed by mixing y ash, cement and quicklime, and the solidi cation effect was compared. The permeability coe cient, cohesion and internal friction angle of manganese slag were measured by permeability test and triaxial test. On this basis, optimization of manganese slag road sections under different slope heights and different slope ratios in a total of 50 schemes was carried out. GeoStudio software is used to perform nite element simulation on the slope stability of manganese slag slopes under dead weight and rainfall.This study provides a reference for highway construction projects using manganese slag.

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“…At present, the utilization of these three types of waste residues is mainly focused on the preparation of building materials. For example, EMR is used in autoclaved bricks, ecological cement, geopolymer; RM is used to replace clay for non-burned brick, road materials, and cementitious material; while CS can be used as an alternative for limestone in cement production, or xonotlite [ 19 ]. At the same time, landfilling or open-air accumulation is the main disposal method of these residues, which causes harm to the soil and groundwater, thereby harming the ecological environment.…”

Section: Introductionmentioning

confidence: 99%

“…Recycling and reusing them can effectively protect the environment. Zhang et al [ 19 ] used electrolytic manganese slag, red mud and calcium carbide slag as road materials, and investigated their mechanical properties, durability, strength formation mechanism and environmental behavior. Using manganese slag as subgrade material and reasonably recycling manganese slag materials cannot only solve the problems of manganese slag storage, environmental pollution and land occupation, but it can reduce the production cost and bring considerable ecological and social benefits.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Basic Physical and Chemical Characteristics of Manganese Slag before and after Solidification and Its Feasibility as Highway Slope

et al. 2021

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Manganese slag is a kind of industrial waste produced by electrolytic production of manganese metal. The traditional method of stacking manganese slag not only causes waste of resources, but also produces environmental pollution. Finding harmless, effective, and economical disposal technology of manganese slag has gradually become a research hotspot and difficulty in the field of electrolytic manganese industry and environmental protection. To verify the feasibility of using manganese slag as roadbed material, the basic physical and chemical properties of manganese slag were analyzed based on X-ray diffraction, X-ray fluorescence spectrum, SEM scanning electron microscope, and particle analysis, the basic engineering characteristics of raw materials of manganese slag and solidified manganese slag mixed with quicklime were analyzed through a compaction test and a CBR test. Finally, based on the Monte Carlo method, the stability of a highway slope in the Guizhou Province of China is simulated by the finite element method, considering the spatial variability of manganese slag material strength parameters. The results show that the solidified manganese slag material can be used as highway subgrade material. This study has important reference significance for manganese slag highway construction projects.

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Synergic effects of electrolytic manganese residue-red mud-carbide slag on the road base strength and durability properties

Cited by 88 publications

References 31 publications

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Tailings after Iron Extraction in Bayer Red Mud by Biomass Reduction: Pozzolanic Activity and Hydration Characteristics

Study on Solidification Treatment of Electrolytic Manganese Slag and Numerical Simulation of Slope Stability

Analysis of Basic Physical and Chemical Characteristics of Manganese Slag before and after Solidification and Its Feasibility as Highway Slope

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