Effect of steel slag on fresh, hardened and microstructural properties of high-calcium fly ash based geopolymers at standard curing condition

Song, Wei; Zhu, Zhiduo; Peng, Yuyi; Wan, Yu; Xu, Xiaoyu; Pu, Shaoyun; Song, Shigong; Wei, Yongqiang

doi:10.1016/j.conbuildmat.2019.116933

Cited by 89 publications

(22 citation statements)

References 79 publications

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“…The structure of the matrix is typical for fly ash-based geopolymers with aggregate [22][23][24]. The small holes left by unreacted spherical particles in the matrix are noticeable [25]. This is common for samples as revealed by investigating their mechanical properties.…”

Section: Resultsmentioning

confidence: 98%

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

et al. 2020

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The additive manufacturing technologies are fast-developing industrial sector and, potentially, a ground-breaking technology. They have many advantages such as the saving of resources and energy efficiency. However, the full exploitation of 3D printing technology for ceramic materials is currently limited; a lot of research is being conducted in this area. A promising solution seems to be geopolymers, but its application requires a better understanding of the behaviour this group of materials. This article analyses the influence of microstructure on mechanical properties whilst taking the production method into consideration. The paper is based on comparative analysis – the investigation is focused on the influence of material structure on the mechanical properties and fracture mechanism of these kinds of composites, including those reinforced with different kind of fibres. As a raw material for the matrix, fly ash from the Skawina coal power plant (located in: Skawina, Lesser Poland, Poland) was used. The investigation was made by SEM analysis. The results show that the microstructural analysis did not sufficiently explain the underlying reasons for the observed differences in the mechanical properties of the composites.

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Section: Resultsmentioning

confidence: 98%

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

et al. 2020

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“…The residual shells of FA after the reaction are clearly seen in the geopolymer matrix. Large amounts of amorphous network gel product and CSH gel were generated, covering the residual particles to form a continuous gel mass and resulting in a relatively dense microstructure [ 35 , 36 ]. The EDX spectrum revealed high contents of Si, Al, and Ca, which were the products of hydration and geopolymeric reaction.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of Waste Iron Powder as a Fine Filler in a High-Calcium Fly Ash Geopolymer

et al. 2021

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Geopolymer (GP) has been applied as an environmentally-friendly construction material in recent years. Many pozzolanic wastes, such as fly ash (FA) and bottom ash, are commonly used as source materials for synthesizing geopolymer. Nonetheless, many non-pozzolanic wastes are often applied in the field of civil engineering, including waste iron powder (WIP). WIPs are massively produced as by-products from iron and steel industries, and the production rate increases every year. As an iron-based material, WIP has properties of heat induction and restoration, which can enhance the heat curing process of GP. Therefore, this study aimed to utilize WIP in high-calcium FA geopolymer to develop a new type of geopolymer and examine its properties compared to the conventional geopolymer. Scanning electron microscopy and X-ray diffraction were performed on the geopolymers. Mechanical properties, including compressive strength and flexural strength, were also determined. In addition, setting time and temperature monitoring during the heat curing process were carried out. The results indicated that the addition of WIP in FA geopolymer decreased the compressive strength, owing to the formation of tetrahydroxoferrate (II) sodium or Na2[Fe(OH)4]. However, a significant increase in the flexural strength of GP with WIP addition was detected. A flexural strength of 8.5 MPa was achieved by a 28-day sample with 20% of WIP addition, nearly three times higher than that of control.

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“…Several studies have been undertaken to understand the investigation effects of steel slag on hydration properties of alkali-activated fly ash materials. Song et al [54] used steel slag with various replacement levels (0, 10%, 20%, 30%, 40% and 50% by mass) to replace fly ash for alkali-activated binary composite material. ey evaluated the influence of steel slag on setting times, flowability, viscosity, strength, absorptivity, and microstructural properties at standard curing conditions [54].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

“…Song et al [54] used steel slag with various replacement levels (0, 10%, 20%, 30%, 40% and 50% by mass) to replace fly ash for alkali-activated binary composite material. ey evaluated the influence of steel slag on setting times, flowability, viscosity, strength, absorptivity, and microstructural properties at standard curing conditions [54]. Adding steel slag obviously increased the setting times and flowability but decreased the viscosity [54].…”

Section: Properties Of Alkali-activated Steel Slagmentioning

confidence: 99%

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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Effect of steel slag on fresh, hardened and microstructural properties of high-calcium fly ash based geopolymers at standard curing condition

Cited by 89 publications

References 79 publications

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

The influence of microstructure on mechanical properties of 3D printable geopolymer composites

Characteristics of Waste Iron Powder as a Fine Filler in a High-Calcium Fly Ash Geopolymer

Advances in Understanding the Alkali‐Activated Metallurgical Slag

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