The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete

Xu, Fan; Wang, Sheliang; Li, Tao; Liu, Bo; Zhao, Nan; Liu, Kangning

doi:10.1016/j.conbuildmat.2020.121273

Cited by 40 publications

(20 citation statements)

References 32 publications

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“…Five concrete mixtures were prepared with water-cement ratio of 0.4, as shown in Table 5. In our previous papers, RAC containing 30% IOTs exhibited the best mechanical properties [13,[31][32][33]. Consequently, control concrete was prepared by adding 30% RCA instead of NCA and 30% IOTs instead of natural sand.…”

Section: Mixture Proportion and Specimen Preparationmentioning

confidence: 99%

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

et al. 2021

Materials

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To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle test. The results indicated that PPF had a beneficial impact on reducing the brittleness of TRAC. With the increase in PPF content, the peak strain increased, the elastic modulus decreased, and the peak stress and energy absorption capacity increased at first and then decreased. Furthermore, the microstructure investigation revealed that the interface friction between the PPF, aggregate, and cement matrix was the main source of energy dissipation. When the load acted on the concrete, the stress was dispersed to the fiber monofilaments, thus effectively enhancing the peak stress and peak strain of concrete and suppressing the generation and development of cracks in the concrete. In terms of freeze–thaw resistance, adding a small amount of PPF could reduce the negative effects of the freeze–thaw process on the cement matrix. On the premise of ensuring strength, the waste utilization should be as high as possible. Therefore, it was suggested that the content of PPF in fiber-reinforced tailings recycled aggregate concrete (TRAC-PP) should be 0.6%.

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Section: Mixture Proportion and Specimen Preparationmentioning

confidence: 99%

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

et al. 2021

Materials

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“…The results revealed that the compressive strength of IOT concrete was higher than that of NS concrete in different replacement ratios, with up to 12.9% being a maximum increase ratio. Although the splitting tensile strength of IOT concrete was higher than that of control mixture, the strength was decreased with the increase in IOT content Li et al 6 and Xu et al 7,8 found that the incorporation of IOT into recycled aggregate concrete can improve the compressive strength and splitting tensile strength, but the brittleness of the concrete was increased.…”

Section: Introductionmentioning

confidence: 97%

“…In the current scenario, motivation behind the study of IOT in concrete not only recycles IOT on a large scale but also alleviates the shortage of natural resources. Throughout the review of the existing literatures, [4][5][6][7][8] IOT has proved its potential as a replacement for natural sand (NS). Shattima et al 5 evaluated the concrete made with 0%-100% NS replacement by IOT.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties of macro‐synthetic fiber‐reinforced iron ore tailings concrete

Zhao

Shi

et al. 2021

Structural Concrete

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Macro‐synthetic fiber‐reinforced iron ore tailings (IOT) concrete is an environment‐friendly building material featured by recycling IOT and improving performance of IOT concrete due to fiber incorporation. In this study, the mechanical properties of macro‐synthetic fiber‐reinforced concrete incorporating IOT were investigated. Two different replacement ratios of IOT (i.e., 0% and 50%) and six types of macro‐synthetic fibers at 1.0 vol% were adopted to investigate the effects of IOT, aspect ratio, elastic modulus, and tensile strength of macro‐synthetic fibers on mechanical properties of concrete. The results indicate that the concrete with IOT for natural sand (NS) replacement in 50 wt% demonstrates no loss in compressive strength and a minor loss of 7.67% in fracture energy, but the incorporation of IOT lowers splitting tensile strength and limit of proportionality, especially the splitting tensile strength with a decrease of 18.50%. The splitting tensile strength, equivalent flexural tensile strength, residual flexural tensile strength, and fracture energy were notably improved by adding macro‐synthetic fibers. Experimental results using Tukey test and Student's t test demonstrated that the fiber aspect ratio was more effective in improving equivalent flexural tensile strength, residual flexural tensile strength, and fracture energy than the elastic modulus and tensile strength of fibers, and the residual flexural tensile strength fR,4 was enhanced by 146.34% when increasing the fiber aspect ratio from 36 to 60.

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“…Presently, some scholars have made systematic research on RAC, tailing concrete, and fiber concrete separately, while studies on TRC with fiber are even rarer. Professor Wang Sheliang from Xi’an University of Architecture and Technology conducted a systematic macro and micro study on the carbonization [ 4 , 21 ], sulfate erosion [ 22 ], freeze-thaw cycles [ 23 ], and other characteristics of green concrete. Therefore, the carbonization durability and erosion characteristics of TRC are studied in this paper, which will contribute to its engineering application.…”

Section: Introductionmentioning

confidence: 99%

Study on Carbonization Characteristics and Deterioration Mechanism of Recycled Concrete with Tailings and Polypropylene Fiber

Zhan

Chen

et al. 2022

Polymers

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To improve the deformation performance of recycled concrete with tailings (TRC), its carbonization characteristics and deterioration mechanism with different polypropylene fiber content were analyzed macroscopically and microscopically. The results showed that the fiber had little effect on the compressive strength, which increased first and then decreased, with the optimum content being 0.6%. The splitting tensile strength first increased and then tended to be stable, with the optimum dosage ranging from 0.6% to 0.9%. The more the content, the higher the peak strain and the lower the elastic modulus. The rising section of its constitutive curve changed little, while the falling section became more gentle. Carbonization made the relative dynamic elastic modulus change small with a trend of first increasing and then decreasing, and the optimum content was 0.6–0.9%. When the fiber content was small, the influence on the carbonization depth did not remain significant, but when it was large, the depth increased obviously, and this critical content was about 0.6%. Microscopically, through nuclear-magnetic resonance (NMR) and scanning electron microscope (SEM) analysis, due to the strong tensioning effect of the fiber, when a small amount was added, the porosity and pore structure had not been significantly changed, so the impact on its resistance to carbonization was not obvious. However, after excessive addition, the interface transition zone (ITZ) between different materials became larger, resulting in a significant increase of its harmful cracks and a great impact on the anti-carbonization ability, with the optimal content being about 0.6%. This study provides a theoretical reference for the deformation performance improvement measure of TRC, which would be helpful for the rapid promotion and application of green concrete in engineering practice.

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The mechanical properties and resistance against the coupled deterioration of sulfate attack and freeze-thaw cycles of tailing recycled aggregate concrete

Cited by 40 publications

References 32 publications

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

Study on mechanical properties of macro‐synthetic fiber‐reinforced iron ore tailings concrete

Study on Carbonization Characteristics and Deterioration Mechanism of Recycled Concrete with Tailings and Polypropylene Fiber

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