Improving mechanical behavior and microstructure of concrete by using BOF steel slag aggregate

Lai, M.H.; Zou, Jia-Jun; Yao, Boyu; Ho, J.C.M.; Zhuang, Xin; Wang, Qing

doi:10.1016/j.conbuildmat.2021.122269

Cited by 122 publications

(31 citation statements)

References 55 publications

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“…Given this, slag valorisation technologies are of high importance in the use of slag as secondary resource, both for the steel sector and for other sectors, such as the construction or cement industries. This fact has prompted scientists and engineers to work on novel solutions based on more eco-friendly industrial concepts, mainly in the field of construction [7,8]. Roads are the most dominant forms of transport infrastructure in Europe, and a major contributor to the European economy.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

et al. 2021

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Blast Oxygen Furnace (BOF) slag represents one of the largest waste fractions from steelmaking. Therefore, slag valorisation technologies are of high importance regarding the use of slag as a secondary resource, both in the steel sector and in other sectors, such as the construction or cement industries. The main issue regarding the use of BOF slag is its volumetric instability in the presence of water; this hampers its use in sectors and requires a stabilisation pre-treatment. These treatments are also cost-inefficient and cause other environmental issues. This paper analyses the use of untreated BOF slag from a technical and environmental point of view, suggesting it as an alternative to natural aggregates in road surface layers and asphalt pavements. A comprehensive analysis of the requirements to be met by raw materials used in asphalt mixes was performed, and a pilot test was carried out with two different mixtures: one mix with limestone as coarse aggregate and another with 15% BOF slag. Furthermore, the global warming impacts derived from each mix with different aggregates were measured by Life Cycle Analysis (LCA), and a transport sensitivity analysis was also performed. The results show how the utilization of BOF slag as coarse aggregate in road construction improves the technical performance of asphalt mixtures (Marshall Quotient 4.9 vs. 6.6). Moreover, the introduction of BOF slag into the asphalt mix as a coarse aggregate, instead of limestone, causes a carbon emissions reduction rate of more than 14%.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

et al. 2021

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“…The cement used in this study was ordinary Portland cement (OPC) from Asia Co., Korea. The following aggregates were obtained in the form of fine aggregates from POSCO Company of Pohang, Korea: NS (specific gravity = 2.60 g/cm 3 ; fineness modulus = 2.89), blast furnace sand (BS) (specific gravity = 2.81 g/cm 3 ; fineness modulus = 2.37), and ferronickel slag sand (FS) (specific gravity = 3.05 g/cm 3 ; fineness modulus = 3.51). AMFs with a specific gravity of 7.2, tensile strength of 1400 N/mm 2 , thickness of 24 µm, and length of 15 mm (Seva, France) were used.…”

Section: Methodsmentioning

confidence: 99%

“…With the increasing stringency of various environmental regulations and the depletion of natural aggregate resources, the availability of high-quality aggregates is on the decline. Consequently, the construction industry has invested significant efforts toward enhancing the quality of concrete and achieving sustainable development through the utilization of industrial by-products and development of alternative aggregates [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Amorphous Metallic Fibers on Strength and Drying Shrinkage of Mortars with Steel Slag Aggregate

2021

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Recently, with increasingly stringent environmental regulations and the depletion of natural aggregate resources, high-quality aggregates have become scarce. Therefore, significant efforts have been devoted by the construction industry to improve the quality of concrete and achieve sustainable development by utilizing industrial by-products and developing alternative aggregates. In this study, we use amorphous metallic fibers (AMFs) to enhance the performance of mortar with steel slag aggregate. Testing revealed that the 28-day compressive strength of the sample with steel slag aggregate and AMFs was in the range of 48.7–50.8 MPa, which was equivalent to or higher than that of the control sample (48.7 MPa). The AMFs had a remarkable effect on improving the tensile strength of the mortar regardless of the use of natural aggregates. With AMFs, the drying shrinkage reduction rate of the sample with 100% steel slag aggregate was relatively higher than that of the sample with 50% natural fine aggregate. Furthermore, the difference in the drying shrinkage with respect to the amount of AMFs was insignificant. The findings can contribute to sustainable development in the construction industry.

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“…Meanwhile, a recent study on the topic of concrete containing both fine and coarse BOF aggregates [53]. In this study, the authors made use of a polycarboxylate superplasticizer and thus was able to assure proper workability in the vast majority of the compositions studied.…”

Section: Basic Oxygen Electric Arc and Ladle Metallurgy Slagsmentioning

confidence: 99%

Advantages and shortcomings of the utilization of recycled wastes as aggregates in structural concretes

Miraldo

Lopes

Pacheco-Torgal

et al. 2021

Construction and Building Materials

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h i g h l i g h t sComprehensive, systematic review on current state of the art concerning the utilization of a wide array of wastes as aggregates, in ordinary Portland cement concrete compositions, for structural applications. Analysis of the advantages and shortcomings for each recycling material in the context of the adoption of circular patterns in the construction sector life cycle. Evaluation of alkali-activated binders as an alternative for overcoming important shortcomings of Portland cement-based structural concretes.

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Improving mechanical behavior and microstructure of concrete by using BOF steel slag aggregate

Cited by 122 publications

References 55 publications

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

Comprehensive Analysis of Steel Slag as Aggregate for Road Construction: Experimental Testing and Environmental Impact Assessment

Effect of Amorphous Metallic Fibers on Strength and Drying Shrinkage of Mortars with Steel Slag Aggregate

Advantages and shortcomings of the utilization of recycled wastes as aggregates in structural concretes

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