Freeze-thaw resistance of recycled aggregate concrete incorporating ferronickel slag as fine aggregate

Bao, Jiuwen; Zheng, Rui; Yu, Zihao; Zhang, Peng; Song, Qiang; Xu, Jianguang; Gao, Song

doi:10.1016/j.conbuildmat.2022.129178

Cited by 29 publications

(6 citation statements)

References 52 publications

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“…The results suggest that the UHPGC with fly ash is less frost resistant than one with SF or GGBS. These results are consistent with previous studies [37,53]. Substantially, under ASTM C666, all mixtures with 16 M offer the best durability when compared to the other combinations because they lose less than 5% of their weight.…”

Section: Water Sorptivitysupporting

confidence: 92%

Multiscale Characterization at Early Ages of Ultra-High Performance Geopolymer Concrete

et al. 2022

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The main obstacle of using geopolymer as a construction repair material is its slow strength development rate, which is the most significant attribute of an early-age opening for traffic and striking-off formwork. Geopolymer technology has recently attracted huge interest as an alternative to traditional cementitious materials with low environmental impact. Thus, this study investigates the feasibility of developing an ultra-high performance geopolymer concrete (UHPGC) with the aim of achieving high early-age strength. For this purpose, UHPGC mixtures activated with different potassium hydroxide molarities and aluminosilicate material types were developed and examined being cured with different curing temperatures. The early strength and durability of the UHPGC after 8 and 24 h were investigated. Experimental results revealed that the optimal mix design of UHPGC corresponds to a KOH molarity of 16 M and a 30% silica fume content. Furthermore, former mixture cured at 100 °C gave superior 8 and 24 h early strength values of 79 and 134 MPa, respectively. Moreover, a superior interaction of slag, silica fume, and activator solution at early age for UHPGC is revealed by the microstructural characteristics examined by a field emission scanning electron microscope (FESEM) with energy dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy analysis, and thermogravimetric (TGA) techniques. It was also found that the compressive strength results and the results of the microstructure analysis are well coincided. The experimental results obtained in this study emphasize the feasibility of using developed UHPGC as an eco-friendly quick repair materials The development of one-part UHPGC as a quick, cost-effective, and high-strength product for all construction repair maintenance will lead to huge improvements in the structural capacity and durability of structural components.

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Section: Water Sorptivitysupporting

confidence: 92%

Multiscale Characterization at Early Ages of Ultra-High Performance Geopolymer Concrete

et al. 2022

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“…Adding 40% ferronickel slag as a fine aggregate in 50% replaced recycled aggregate concrete decreased the water absorption value by 19.76%. This reduction was due to the reaction between the non-crystalline phases in the ferronickel slag, leading to the formation of a larger amount of secondary gel, which improved the weak interfacial zone in the recycled aggregate concrete [87]. The mass loss rate of the RA increased as the recycled aggregate content increased as shown in Figure 8.…”

Section: Frost Resistancementioning

confidence: 96%

A Comprehensive Review on Recycling of Construction Demolition Waste in Concrete

et al. 2023

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There have been efforts to use building demolition waste as an alternative aggregate in concrete to decrease the use of natural resources for construction. The World Green Building Council estimates that the construction industry is responsible for more than 50% of all material extracted globally and that construction and demolition waste makes up 35% of global landfills. As a result, incorporating recycled aggregate (RA) in concrete production is a prudent course of action to reduce the environmental impact. This study reviews prior research on using recycled aggregate instead of conventional ingredients in concrete. The composition and morphology of different types of RA, the behavior of RA in fresh and hardened states, keyword co-occurrence and evolution analysis, and the various additives used to enhance the inferior properties of RA are discussed. The RA showed different physical properties when compared with natural aggregate. However, the addition of pozzolanic materials and various pretreatment techniques is desirable for improving the inferior properties of RA. While building waste has been utilized as a substitute for fine and coarse aggregate, prior research has demonstrated that a modified mixing approach, an adequate mixing proportion, and the optimum replacement of cementitious materials are necessary. Based on the review, the recommendation is to use RA at a replacement level of up to 30% and the addition of precoated and pozzolanic materials as a treatment to provide concrete with adequate workability, strength, and durability for structural applications.

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“…11 And appropriate addition of FNS can also improve the frost resistance of recycled concrete. 12 It is found that different particle size ranges have significant influence on the compressive strength of recycled concrete. The recycled concrete with a particle size of 5-30 mm has the best compressive strength because the aggregate particles are evenly distributed and well graded within this particle size range.…”

Section: Introductionmentioning

confidence: 99%

Size effect on dynamic compressive failure mode and mechanical properties of recycled concrete

Liu

Gao

Luan

et al. 2023

Structural Concrete

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In order to study the size effect behavior of recycled concrete under dynamic compression load, a meso‐scale model of recycled concrete was established. The particle size of coarse aggregate, replacement ratio of recycled coarse aggregate, and section size were used as parameters to explore the mechanical properties of recycled concrete under uniaxial dynamic compression load, such as failure mode, compressive strength, peak strain, and residual strength. The effects of strain rate, particle size of recycled coarse aggregate, and replacement rate of recycled coarse aggregate on the size effect of dynamic compression of recycled concrete were further analyzed. The results showed that under uniaxial dynamic compression load, the damage degree of recycled concrete deep and along with the change of the strain rate change, recycled concrete dynamic compression strength and strain rate were positively correlated. There is the critical strain rate is 1/s, which weaken the influence of the size effect, when the strain rate reaches 10/s, the dynamic compressive strength of recycled concrete increases with the increase of section size. At the same time, when the strain rate is high, the particle size of recycled coarse aggregate and the replacement rate of recycled coarse aggregate have little effect on the size effect behavior of recycled concrete.

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Freeze-thaw resistance of recycled aggregate concrete incorporating ferronickel slag as fine aggregate

Cited by 29 publications

References 52 publications

Multiscale Characterization at Early Ages of Ultra-High Performance Geopolymer Concrete

Multiscale Characterization at Early Ages of Ultra-High Performance Geopolymer Concrete

A Comprehensive Review on Recycling of Construction Demolition Waste in Concrete

Size effect on dynamic compressive failure mode and mechanical properties of recycled concrete

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