The mechanical properties of tailing recycled aggregate concrete and its resistance to the coupled deterioration of sulfate attack and wetting–drying cycles

Xu, Fan; Wang, Sheliang; Li, Tao; Liu, Bo; Li, Binbin; Zhou, Yuan

doi:10.1016/j.istruc.2020.07.052

Cited by 38 publications

(21 citation statements)

References 36 publications

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“…Sulfate corrosion, i.e., by SO 4 2− ions, was identified in concrete already in the second half of the 19th century. Since then, hundreds of experiments have been conducted and hundreds of manuscripts have been published, e.g., [7][8][9][10]. Nevertheless, the topic of sulfate corrosion is still relevant.…”

Section: Sulfate Corrosion-basic Knowledge Of the Processmentioning

confidence: 99%

Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates

et al. 2021

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This paper presents experimental and analytical work of which the main objective was to support the introduction of a new technology for the production of sewer pipes. In this technology, the pipes produced consist of two differently produced parts. The direct part uses conventional vibro press compacted concrete. In the curved part, on the other hand, self-compacting concrete technology is used. The cooperating company, Prefa Brno a.s., defined possible negative effects on concrete of sewer pipes. The task of the research team and now the author’s team was to propose a procedure for the development of suitable self-compacting concrete variants and subsequently the design of a methodology to verify their durability in aqueous environments containing sulfates. To increase the efficiency of the development, the model mortar method was used in the experimental work. That is, instead of the original concrete, a model mortar derived from it was tested. The principle and procedure of derivation of model mortars are described in the paper. In total, eight variants of model mortars were tested, and at least three of them fulfilled the requirements. An optional but beneficial part of the carried out work was the derivation and practical application of the time-anchored-triangles-of-cracking graphical method developed during the research. This method is used to quickly compare the degree of attack of different silicate composites tested in a common bath inducing type III corrosion.

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Section: Sulfate Corrosion-basic Knowledge Of the Processmentioning

confidence: 99%

Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates

et al. 2021

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“…In the past few decades, the generation of concrete related waste has increased alarmingly due to the demolition of old buildings/structures [23,24]. As a result, there is a high demand for recycling the concrete waste generated in the production of new concrete [25,26].…”

Section: Introductionmentioning

confidence: 99%

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

Munir

Kazmi

et al. 2021

Sustainability

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The addition of macro-polypropylene fibres improves the stress-strain performance of natural aggregate concrete (NAC). However, limited studies focus on the stress-strain performance of macro-polypropylene fibre-reinforced recycled aggregate concrete (RAC). Considering the variability of coarse recycled aggregates (CRA), more studies are needed to investigate the stress-strain performance of macro-polypropylene fibre-reinforced RAC. In this study, a new type of 48 mm long BarChip macro-polypropylene fibre with a continuously embossed surface texture is used to produce BarChip fibre-reinforced NAC (BFNAC) and RAC (BFRAC). The stress-strain performance of BFNAC and BFRAC is studied for varying dosages of BarChip fibres. Results show that the increase in energy dissipation capacity (i.e., area under the curve), peak stress, and peak strain of samples is observed with an increase in fibre dosage, indicating the positive effect of fibre addition on the stress-strain performance of concrete. The strength enhancement due to the addition of fibres is higher for BFRAC samples than BFNAC samples. The reduction in peak stress, ultimate strain, toughness and specific toughness of concrete samples due to the utilisation of CRA also reduces with the addition of fibres. Hence, the negative effect of CRA on the properties of concrete samples can be minimised by adding BarChip macro-polypropylene fibres. The applicability of the stress-strain model previously developed for macro-synthetic and steel fibre-reinforced NAC and RAC to BFNAC and BFRAC is also examined.

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“…The stacked IOTs not only occupy vast land resources but also cause lasting environmental pollution. Furthermore, the main chemical compositions of IOTs are silicon and aluminum, which are similar to the component of cementitious materials [13]. This provides a prerequisite for the application of IOTs in the field of building materials.…”

Section: Introductionmentioning

confidence: 99%

“…However, our previous study found that in the stress-strain test, TRAC suddenly collapsed after peak stress. TRAC had the disadvantages of poor ductility and uncontrollable crack width after cracking, which limited its use in buildings [13]. It has been reported that a significant increase in the ductility of concrete can be achieved by polypropylene fibers (PPF) [14][15][16].…”

Section: Introductionmentioning

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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The mechanical properties of tailing recycled aggregate concrete and its resistance to the coupled deterioration of sulfate attack and wetting–drying cycles

Cited by 38 publications

References 36 publications

Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates

Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates

Axial Stress-Strain Performance of Recycled Aggregate Concrete Reinforced with Macro-Polypropylene Fibres

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

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