Mechanical properties and pore structure of recycled aggregate concrete made with iron ore tailings and polypropylene fibers

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

doi:10.1016/j.jobe.2020.101572

Cited by 69 publications

(37 citation statements)

References 36 publications

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“…To solve the complexity of the use of RA in new concrete safely, some researchers proposed new mixture prescriptions including mineral additions (i.e., silica fume (SF) [ 3 , 4 ], ground granulated blast furnace slag (GGBS) [ 5 , 6 ], metakaolin [ 7 ], fly ash (FA) [ 8 , 9 , 10 , 11 ], fibers with/without mineral addition (i.e., polypropylene [ 9 ], polypropylene + SF [ 12 ], steel fiber + SF [ 4 ], basalt fiber [ 13 , 14 ], basalt fiber + nano-silica [ 15 ], waste-plastic strip + FA [ 16 ], steel fiber + FA [ 17 ], steel fiber + GGBS [ 18 ], glass fiber + FA [ 19 ] or redefining mixing method (i.e., Equivalent Mortar Volume Method (EMV) [ 20 , 21 ], two stage mixing method [ 22 ]. The suggestions presented satisfactory results and gave confidence to mix designers of RAC.…”

Section: Introductionmentioning

confidence: 99%

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Dilbas

Güneş

2021

Materials

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This paper presents influence of treatment and mixing methods on recycled aggregate concretes (RAC) designed regarding various techniques. Absolute Volume Method (AVM) according to TS 802, Equivalent Mortar Volume Method (EMV), silica fume (SF) as a mineral addition were considered in the design of concretes. In total, four groups of concretes were produced in the laboratory: 1) natural aggregate concrete (NAC) designed with AVM as control concrete, 2) RAC designed with AVM as control RAC, 3) RAC with SF as a mineral addition designed with AVM as treated RAC and 4) RAC designed with EMV as treated RAC. The tests were performed at 28th days and the statistical analysis were made on the test results. According to the results, EMV and SF increased the compressive strength of concretes and this resulted an increase in the strength class of concrete. A significant statistical difference between the concretes were determined. According to multiple comparison analysis, it was found that especially there was a significant relationship among NAC, RAC and RAC-EMV. In addition, it was recommended that EMV and AVM with 5% SF could be used in the design of RAC rather than AVM only to achieve the target strength class C30/37.

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Section: Introductionmentioning

confidence: 99%

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Dilbas

Güneş

2021

Materials

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“…When a load is applied to the concrete, the compression process is a combination of of energy absorption, dissipation, and release processes [36]. As shown in Figure 8 The energy conversion of the concrete during uniaxial compression can be expressed by Equation ( 1):…”

Section: Energy Dissipation Capacitymentioning

confidence: 99%

“…When a load is applied to the concrete, the compression process is a combination of of energy absorption, dissipation, and release processes [36]. As shown in Figure 8…”

Section: Energy Dissipation Capacitymentioning

confidence: 99%

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Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

et al. 2021

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In this work, to reduce the probability of brittle failure in the support structure of deeply buried high-stress soft rock roadways, hybrid-fiber reinforced rubber concrete (HFRRC) was investigated using the orthogonal test, and the effects of various factors on the performance were studied. The mechanical properties, pore structure, and microstructure of rubber concrete reinforced by basalt fiber (BF) and polyvinyl alcohol fiber (PF) were studied from macroscale, mesoscale, and microscale perspectives. The results revealed that the content of the rubber particles has a significant impact on strength. Further, the addition of the hybrid fibers to the concrete was found to have a positive effect on the splitting tensile strength and the flexural strength. However, no significant effect was observed on the compressive strength. Furthermore, it was found that the content of BF and PF have a significant impact on the energy dissipation capacity and ductility, and the influence of the PF content is greater than that of the BF content. The concrete with 10% rubber particles of 1–3 mm, a volume fraction 0.3% basalt fiber, and a volume fraction 0.2% polyvinyl alcohol fiber was obtained as the optimal mix proportions. Moreover, it was found that the random distribution of the rubber particles and the hybrid fibers optimized the pore structure, inhibited the expansion of the cracks, and reduced the brittleness of the concrete. The findings of this study can provide a useful reference for the application of an environmentally friendly material with recycled rubber aggregate and hybrid fiber.

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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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Mechanical properties and pore structure of recycled aggregate concrete made with iron ore tailings and polypropylene fibers

Cited by 69 publications

References 36 publications

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Mineral Addition and Mixing Methods Effect on Recycled Aggregate Concrete

Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

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

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