Quantitative evaluation of interfacial transition zone of sustainable concrete with recycled and steel slag as aggregate

Wu, Kai; Hu, Yuan; Zhang, Lintao; Su, Yufeng; Yang, Zhenghong; Schutter, Geert De

doi:10.1002/suco.202000135

Cited by 18 publications

(9 citation statements)

References 47 publications

(47 reference statements)

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“…However, it should be noted that the destruction of concrete structures subject to static and dynamic effects is determined by the quality of ITZ in the area of coarse aggregate grains [45][46][47][48][49][50]. It was proved in paper [50] that W c in this zone is lower by almost 35% in the case of concretes modified with 20% FA additive.…”

Section: Introductionmentioning

confidence: 95%

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

Golewski

2021

Energies

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The paper presents results of tests on the effect of the addition of fly ash (FA) in the amounts of 0%, 20%, and 30% by weight of cement on the interfacial microcracks in concrete composites subjected to dynamic loads. The analyses were carried out based on the results of the microstructural tests using a scanning electron microscope (SEM). The average width of the microcracks (Wc) in the interfacial transition zone (ITZ) of coarse aggregate with cement matrix was evaluated. During the studies beneficial effect of the addition of FA on reduction of the size of Wc in the ITZ of concrete composites under dynamic loading were observed. Based on obtained test results, it was found that using the 20% FA additive causes favorable changes in the microstructure of mature concrete. In this composite, the average value of Wc was lower by more than 40% compared to the result obtained for the reference concrete. In contrast, concrete containing 30% FA additive had greater microcracks in the ITZ area by over 60% compared to the material without additive. In all analyzed composites, an increase in the Wc value by almost 70% to over 110% in the case of occurrence of dynamic loads was also observed. This was the most evident in the case of concrete with a higher content of FA.

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Section: Introductionmentioning

confidence: 95%

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

Golewski

2021

Energies

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“…As SSA is stronger than NA and has a rougher surface than NA, the bonding strength with the cement slurry increases. However, the addition of SSA increases the porosity of the concrete, and owing to its high angularity, steel slag requires more cement to cover its surface, which reduces the strength of the concrete [92]. These positive and negative effects have a competitive effect, resulting in an overall increase or decrease in strength.…”

Section: Influence Of Slag On Compressive Strength Of Concretementioning

confidence: 99%

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Zhang¹,

Wang²,

Zheng³

et al. 2023

Journal of Renewable Materials

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Using recycled aggregate (RA) and slag instead of natural aggregate (NA) and cement can reduce greenhouse gas emissions (GHGE) and achieve effective waste recovery. In recent years, RA has been widely used to replace NA in concrete. Every year, several researchers conduct investigations on the mechanical performance and durability of recycled aggregate concrete (RAC). Due to the loose and porous material properties of RA, the mechanical properties and durability of RAC, such as strength, carbonation resistance, permeability resistance and chloride ion penetration resistance, are greatly reduced compared with natural aggregate concrete. In contrast, concrete containing slag instead of NA and cement generally improved the strength of concrete and reduced the internal porosity of materials. Herein, we discuss the effects of RA and slag on the workability, compressive strength, splitting tensile strength, ultrasonic pulse velocity (UPV) value, and elastic modulus of concrete. The relationships between the compressive strength and the splitting tensile strength, UPV value, and elastic modulus are discussed, and the optimal substitution method is proposed. In addition, various equations for calculating the compressive strength of concrete based on performance factors related to the compressive strength are summarized.

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“…On the other hand, the consumption of concrete in engineering construction is huge, but the natural aggregate is increasingly exhausted, which makes the search for the substitute of natural aggregates to make concrete become a research hotspot. Some scholars intended to use the steel slag as aggregates to prepare steel slag concrete (SSC), and have obtained some achievements 5–9 . Hisham 10 used the steel slag as fine aggregates and found that when the replacement ratio was between 15% and 30%, the enhancement of compressive strength was best.…”

Section: Introductionmentioning

confidence: 99%

“…Some scholars intended to use the steel slag as aggregates to prepare steel slag concrete (SSC), and have obtained some achievements. [5][6][7][8][9] Hisham 10 used the steel slag as fine aggregates and found that when the replacement ratio was between 15% and 30%, the enhancement of compressive strength was best. Shekhar 11 indicated that as coarse aggregates, when the replacement ratio of steel slag was below 50%, the concrete strength increased with the rise of the replacement ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on seismic behavior of circular steel tube confined reinforced self‐stressing steel slag concrete columns

Chen

et al. 2022

Structural Concrete

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Low‐cycle reversed loading test were conducted on 10 circular steel tube confined reinforced self‐stressing steel slag concrete columns and four circular steel tube confined reinforced steel slag concrete (SSC) columns, to investigate the influence of the shear span ratio, axial compression ratio, diameter‐thickness ratio and expansion ratio of SSC on the seismic performance of the specimens. The results indicated that the crushing of core SSC at the bottom of columns and yielding of longitudinal reinforcement dominated the specimens damage. Fine circumferential tensile cracks without development trend along the height direction appeared at the non‐shear plane of the columns. The hysteretic curves were generally full, which denoted that the specimens had good seismic behavior. With the increase of the axial compression ratio, diameter‐thickness ratio, or decrease of the shear span ratio, the strength degradation was more severe and the ductility reduced. The stiffness degradation rate was accelerated with the increase of the axial compression ratio, or reduction of the expansion ratio of SSC or shear span ratio. In addition, as the axial compression ratio or expansion ratio of SSC raised, or the shear span ratio reduced, the ductility of the specimens decreased and the growth of the energy dissipation coefficient was accelerated.

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Quantitative evaluation of interfacial transition zone of sustainable concrete with recycled and steel slag as aggregate

Cited by 18 publications

References 47 publications

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Experimental study on seismic behavior of circular steel tube confined reinforced self‐stressing steel slag concrete columns

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