Reuse of copper slag as a supplementary cementitious material: Reactivity and safety

Wang, Dengquan; Wang, Qiang; Huang, Zongxian

doi:10.1016/j.resconrec.2020.105037

Cited by 67 publications

(25 citation statements)

References 22 publications

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“…Table 1 shows the chemical composition and mineral composition of copper slag cooled with different processes in other studies. Mineral composition of granulated water-cooled CS and air-cooled CS usually contains same mineral components, namely, magnetite (Fe 3 O 4 ) and fayalite (Fe 2 SiO 4 ) [67]. Figure 3 shows the statistical chemical content of copper slag from other studies.…”

Section: Properties Of Copper Slagmentioning

confidence: 94%

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Liu

Zhang

Sun

2021

Advances in Civil Engineering

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This paper summarized and reviewed the mechanism and macro-performance of alkali-activated metallurgical slag, including steel slag, copper slag, ferronickel slag, and lead-zinc slag. Better activated method and alkali-activator are still needed to be developed to improve the performance of the metallurgical slag with low reactivity. Besides, the chemical components’ variation of these metallurgical slags from different regions will lead to unpredictable performance, which needs further study.

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Section: Properties Of Copper Slagmentioning

confidence: 94%

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Liu

Zhang

Sun

2021

Advances in Civil Engineering

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“…Wang proposed that the replacement rate of CS to sand should be less than 40% to avoid bleeding [ 85 ]. This may be attributed to the wrong mixing water content or the lower water absorption of CS (it increases the free water content in the paste) [ 27 ]. It has been found that EFS causes serious bleeding and segregation when it is used as an aggregate [ 86 ].…”

Section: Fresh Propertiesmentioning

confidence: 99%

“…The concentration of glass in different kinds of CS varies substantially due to the diverse cooling processes, resulting in different ways of utilization. Currently, CS can be used as fine aggregate [ 21 , 22 , 23 , 24 , 25 , 26 ] or supplementary cementitious material [ 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Adverse Effects of Using Metallurgical Slags as Supplementary Cementitious Materials and Aggregate: A Review

2022

Self Cite

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This paper discusses a sustainable way to prepare construction materials from metallurgical slags. Steel slag, copper slag, lead-zinc slag, and electric furnace ferronickel slag are the most common metallurgical slags that could be used as supplementary cementitious materials (SCMs) and aggregates. However, they have some adverse effects that could significantly limit their applications when used in cement-based materials. The setting time is significantly delayed when steel slag is utilized as an SCM. With the addition of 30% steel slag, the initial setting time and final setting time are delayed by approximately 60% and 40%, respectively. Because the specific gravity of metallurgical slags is 10–40% higher than that of natural aggregates, metallurgical slags tend to promote segregation when utilized as aggregates. Furthermore, some metallurgical slags deteriorate the microstructure of hardened pastes, resulting in higher porosity, lower mechanical properties, and decreased durability. In terms of safety, there are issues with the soundness of steel slag, the alkali-silica reaction involving cement and electric furnace ferronickel slag, and the environmental safety concerns, due to the leaching of heavy metals from copper slag and lead-zinc slag.

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“…The two changes above have led to complete changes in the composition, preparation methods and performance of modern concrete. Mineral admixtures such as supplementary cementitious materials are an indispensable part of modern concrete [3,4]. The use of highactivity admixtures such as slag and low-activity or inert admixtures such as limestone powder effectively reduces energy and resource consumption by decreasing the amount of cement used in the concrete production process and ensures the green and sustainable development of the concrete industry [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Mineral admixtures such as supplementary cementitious materials are an indispensable part of modern concrete [3,4]. The use of highactivity admixtures such as slag and low-activity or inert admixtures such as limestone powder effectively reduces energy and resource consumption by decreasing the amount of cement used in the concrete production process and ensures the green and sustainable development of the concrete industry [3,4]. More importantly, the use of admixtures reduces the dependence of modern concrete strength on cement strength, improves the rheological properties of the mixture, and increases the durability of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrafine Metakaolin on the Properties of Mortar and Concrete

et al. 2021

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This study investigated the influence of ultrafine metakaolin replacing cement as a cementitious material on the properties of concrete and mortar. Two substitution levels of ultrafine metakaolin (9% and 15% by mass) were chosen. The reference samples were plain cement concrete sample and silica fume concrete sample with the same metakaolin substitution rates and superplasticizer contents. The results indicate that simultaneously adding ultrafine metakaolin and a certain amount of polycarboxylate superplasticizer can effectively ensure the workability of concrete. Additionally, the effect of adding ultrafine metakaolin on the workability is better than that of adding silica fume. Adding ultrafine metakaolin or silica fume can effectively increase the compressive strength, splitting tensile strength, resistance to chloride ion penetration and freeze–thaw properties of concrete due to improved pore structure. The sulphate attack resistance of mortar can be improved more obviously by simultaneously adding ultrafine metakaolin and prolonging the initial moisture curing time.

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Reuse of copper slag as a supplementary cementitious material: Reactivity and safety

Cited by 67 publications

References 22 publications

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Advances in Understanding the Alkali‐Activated Metallurgical Slag

Adverse Effects of Using Metallurgical Slags as Supplementary Cementitious Materials and Aggregate: A Review

Effect of Ultrafine Metakaolin on the Properties of Mortar and Concrete

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