A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

Hajiaghamemar, Mohammadreza; Mostofinejad, Davood; Bahmani, Hadi

doi:10.1002/suco.202200806

Cited by 9 publications

(3 citation statements)

References 44 publications

(102 reference statements)

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“…In the same context, this study shows that the use of steel slag in the total replacement of natural aggregates in high-strength concretes reinforced with steel fibers resulted in a flexural strength of 7.9 MPa at 20°C, decreasing to 4.5 MPa at 800°C, as well as an increase in fracture energy and displacement at fracture when subjected to elevated temperatures [38].…”

Section: Flexural Strength Testmentioning

confidence: 63%

Natural Aggregate Substitution by Steel Slag Waste for Concrete Manufacturing

Es-samlali

2024

GEOMATE

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The release of steel slag into the environment has substantial repercussions, simultaneously affecting both the ecosystem and the economy. Therefore, the management and recovery of this waste demand careful consideration. In the context of the circular economy, this study aims to explore the feasibility of utilizing steel slag waste as a substitute aggregate for natural coarse and fine aggregates in the production of high-quality concrete. Throughout this research, concrete mixtures were developed by varying natural aggregate substitution rates with steel slag waste at 0, 25, 50, 75, and 100%. Comprehensive tests, encompassing physical, mineralogical, chemical, and mechanical analyses, were conducted on the steel slag waste to ascertain its primary technical properties. In all mixtures incorporating steel slag waste, compressive strength tests consistently revealed values surpassing those of the reference concrete. Notably, there were improvements of approximately 12% for coarse aggregate substitution and 32% for sand substitution. Assessments of flexural strength at 7 and 28 days underscored the substantial positive influence of fine and coarse aggregate substitution, especially at a 50% fine aggregate replacement, contributing significantly to enhanced flexural strength compared to conventional concrete. Furthermore, laboratory examinations indicated that the 28-day compressive and flexural strength, as well as water absorption of concrete, increased with slag content, albeit at the expense of reduced workability. Ultimately, the findings demonstrate the effective utilization of slag as a replacement for natural aggregates, maintaining the compressive and flexural strength of the concrete.

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Section: Flexural Strength Testmentioning

confidence: 63%

Natural Aggregate Substitution by Steel Slag Waste for Concrete Manufacturing

Es-samlali

2024

GEOMATE

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“…However, only 30% of the slag generated in China is used after it is created, due to outdated treatment approaches and the lack of an established framework for treating, recycling, and managing slag [18]. Being able to reuse electric arc furnace (EAF) slag can reduce the amount of landfill waste created and, therefore, can be beneficial both to the environment and to the economy [19]. The use of EAF slag in concrete as an aggregate has become somewhat common recently [20]; due to its rock-like structure, EAF slag can replace aggregates in concrete mixes.…”

Section: Introductionmentioning

confidence: 99%

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Muthu,

Kumar,

Chajec

et al. 2024

Applied Sciences

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Replacement of cement with electric arc furnace (EAF) slag at higher volumes causes volumetric expansion; therefore, such blends are not recommended in concrete production. In this study, the effect of this slag on the performance and microstructure of mortar samples based on wollastonite (CaSiO3) was examined. The samples were cured in a CO2-rich environment, resulting in the formation of non-expansive products, including aragonite, calcite, and traces of tobermorite in the microstructure. The addition of slag above 20% affected the workability and strength developments. However, the formation of pores above 100 nm reduced with increasing slag content to 60%, highlighting the beneficial effect of slag when used in higher volumes. EAF slag contains a higher amount of Fe2O3 which limits its disposal at landfills, but its increased use in the production of CO2 gas-cured wollastonite concrete can reduce the environmental burdens caused by the Portland cement and steel manufacturing industries.

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“…6,7 This is a grand challenge for the fire safety of precast concrete frame structures because the building fire occur frequently in recent years. It is well-known that the mechanical behaviors decrease after the material is exposed to elevated temperatures, [8][9][10] which leads to the fire safety of structures degrading. Therefore, the post-fire structure should be reinforced and the structure safety should be evaluated, brought back into service.…”

Section: Introductionmentioning

confidence: 99%

Simulation on seismic performance of the post‐fire precast concrete column with grouted sleeve connections

Liu

Xiao

2023

Structural Concrete

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A simulation method with Abaqus software was adopted to analyze the seismic performance of post-fire precast concrete column with grouted sleeve connections. First, the simulation was exerted on the column at ambient temperature and the grouted sleeve connection was simplified to be a single steel rebar. It is found that the yield load, lateral peak load and ductility coefficient from the simulation result are about 0.89, 0.85, and 1.02 times of those from the test respectively, which shows that the built finite element model is fit for the simulation analysis of precast concrete column and the simplified method of grouted sleeve connection is feasible. Then, a sequential coupling method was used to simulate the seismic performance of cast-in-place column after exposure to elevated temperatures. It is found that the highest temperature, load and ductility coefficient from simulation agree well with those of test, as the maximum difference is only 5.0%. Furthermore, simulations of post-fire precast concrete columns with grouted sleeve connections were based on these practices and the findings as follows: as the elevating time becomes longer, the maximum difference of the highest temperature between the simulation and the theory decreases from 6.7% to 0.6%; compared to the condition at ambient temperature, the lateral peak load decreases linearly along with the elevating time ascending. Finally, a new expression was proposed to calculate the shear bearing capacity of post-fire precast concrete column with grouted sleeve connections, which will be beneficial to the fire safety design of precast concrete structures.

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A high‐strength concrete resistant to elevated temperatures using steel slag aggregates

Cited by 9 publications

References 44 publications

Natural Aggregate Substitution by Steel Slag Waste for Concrete Manufacturing

Natural Aggregate Substitution by Steel Slag Waste for Concrete Manufacturing

Effect of EAF Slag on the Performance of Wollastonite Mixes Inspired by CO2 Curing Technology

Simulation on seismic performance of the post‐fire precast concrete column with grouted sleeve connections

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