Research on the high-temperature resistance of recycled aggregate concrete with iron tailing sand

Zhu, Qian; Yuan, Yixin; Chen, Jihao; Fan, Lín; Yang, Hang

doi:10.1016/j.conbuildmat.2022.126889

Cited by 32 publications

(15 citation statements)

References 30 publications

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“…is is owing to recycled aggregates' high crushing value and low apparent density, which makes them more prone to damage [23,24]. On the one hand, the high water absorption rate of RA causes it to absorb part of the water, and frost heave occurs during the freezing and thawing process, resulting in structural damage and loss.…”

Section: Frost Resistancementioning

confidence: 99%

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

Shang¹,

Feng²,

Rong³

et al. 2022

Advances in Materials Science and Engineering

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In this paper, dry-mixed recycled cement concrete gravel (CCG) piles and dry-mixed cement macadam gravel (CMG) piles were analyzed. CCG and CMG were prepared by using recycled concrete aggregate (RCA) with different substitution rates, recycled macadam aggregate (RMA) from waste bricks and tiles, and fly ash, respectively. Mechanical properties, hydration heat release performance, and frost resistance were used as evaluation factors. The compressive strength, hydration heat, relative dynamic elastic modulus, and mass loss rate were tested. Based on the requirements of subgrade reinforcement on the material strength, hydration heat release, and frost resistance of dry-mixed CRA piles, TOPSIS analysis method was used to conduct a comprehensive evaluation. The results show that the mechanical properties and frost resistance of CCG and CMG gradually deteriorate with the increase of RCA and RMA replacement rates. At the same time, the hydration heat release of CCG and CMG increases with the increase of the replacement rate. The fly ash instead of cement can improve the compressive strength and frost resistance of CCG and CMG and reduce the hydration heat and material cost. When the CCG replacement rate reaches 20%, the CCG composite score of 20% fly ash is higher than that of traditional dry-mixed cement gravel pile and has better comprehensive performance.

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Section: Frost Resistancementioning

confidence: 99%

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

Shang¹,

Feng²,

Rong³

et al. 2022

Advances in Materials Science and Engineering

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“…Iron tailings are inert at room temperature [ 26 , 27 ]. Previous studies have used iron tailings as coarse [ 28 , 29 ] and fine aggregates [ 30 , 31 , 32 , 33 , 34 , 35 ], as well as silica materials for the production of aerated concrete at high temperatures [ 36 , 37 , 38 ]. Some studies have also used iron tailings as an admixture [ 39 , 40 , 41 , 42 , 43 , 44 ] and examined the activation of iron tailings powder [ 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour Evaluation of Full Iron Tailings Concrete Columns under Large Eccentric Short-Term Loading

Sun

Zhang

et al. 2023

Materials

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In this study, full iron tailings concrete (FITC) was created using iron tailings from a tailings pond in Qian’an, China. Iron tailings account for 86.8% of the total mass of solid raw materials in the FITC. To enable large-scale use of FITC, a comprehensive investigation of the structural behaviour of full-iron tailing-reinforced concrete (FITRC) specimens is warranted. Therefore, eight rectangular reinforced concrete (RC) columns with conventional reinforced concrete (CRC) as a control were tested to investigate the effects of section dimensions, initial eccentricities, and concrete strengths, on the structural behaviour of FITRC columns under large eccentric short-term loading. The experimental and analytical results indicated that the sectional strain of the FITRC columns satisfied the plane-section assumption under short-term loading, and the lateral deflection curve agreed well with the half-sinusoidal curve. In addition, the FITRC columns exhibited a slightly lower cracking load and lower ultimate load capacity than the CRC columns, and the crack widths were larger than those of the CRC columns. The reduction in the load capacity observed in the FITRC was within the permissible range stated in the design code, thereby satisfying the code requirements. The deformation coefficients of the FITRC and CRC columns were identical, and the cracking and ultimate loads calculated according to the current code and theories were in good agreement with the measured results.

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“…The results indicated that the recycled concrete column containing iron tailings sand displayed better resistance after exposure to fire. Huang [ 13 ] analyzed the carbonization and macro mechanical properties of TRC and proved that when the iron tailings content was 30%, the performance of recycled concrete reached the level of ordinary concrete.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

Chen

Zhan

et al. 2022

Polymers

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Economic development and infrastructure improvement will inevitably lead to the accumulation of construction waste and tailings, which has not only a huge impact on the environment but is also a waste of resources. Recycling these resources and making green concrete is an effective way to solve these problems. In this study, the salt spray erosion characteristics and erosion mechanism of tailings recycled concrete (TRC) with polypropylene fibers were studied through macro and micro methods. The results showed that its compressive strength and splitting tensile strength increased at first and then decreased, with the optimum content of 0.6–0.9%, and the strength increase coefficient reached its maximum value at the erosion period being 14 d to 28 d. Under the same erosion cycle, when the fiber content was low (≤0.6–0.9%), the erosion depth hardly fluctuated. While the fiber content changed from 0.6% to 1.2%, the erosion depth and curing ability (erosion for 90 days) increased by 16.29% and 11.20%, which implied that its erosion resistance decreased sharply. Through SEM microscopic analysis, it could be observed that when the fiber content was low, the matrix structure and porosity had little change; while the fiber content was excessive, the porosity increased greatly. The longer the erosion period was, the greater the cumulative expansion of salt crystals was, and the larger the porosity was, whose results were in good agreement with the experimental results. This research provides a significant theoretical basis for the application of TRC in engineering.

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Research on the high-temperature resistance of recycled aggregate concrete with iron tailing sand

Cited by 32 publications

References 30 publications

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

Mechanical Behaviour Evaluation of Full Iron Tailings Concrete Columns under Large Eccentric Short-Term Loading

Analysis of Erosion Characteristics and Erosion Mechanism of Polypropylene Fiber Tailings Recycled Concrete in Salt Spray Environment

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