Experimental study on thermal and mechanical behavior of mortar-aggregate under microwave irradiation

Wei, Wei; Shao, Zhushan; Chen, Wenwen; Zhang, Pengju; Cheng, Junxi

doi:10.1016/j.jobe.2020.101947

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…From the aspect of temperature difference, it can be clearly seen that the change in bond strength is related to the temperature gradient between aggregate and mortar. Larger temperature difference at interface result in lower interfacial bond strength, which could facilitate the interface debonding of mortar and aggregate [47]. Microwave generated from waveguide would be reflected continually by the wall of heating cavity.…”

Section: Figure 8 General View Of the Aggregate Push-out Test Set-upmentioning

confidence: 99%

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

Wei

Shao

Chen³

et al. 2021

IEEE Access

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Section: Figure 8 General View Of the Aggregate Push-out Test Set-upmentioning

confidence: 99%

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

Wei

Shao

Chen³

et al. 2021

IEEE Access

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“…The use of microwaves for concrete aggregate recycling started as early as 2011 and is still being investigated to date (Akbarnezhad et al, 2011;Choi et al, 2014;Mousa et al, 2020;Wei et al, 2021a;2021b;2021c). Microwave heating is also used in asphalt road maintenance work, such as hot in-place recycling.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Reclaimed Asphalt Aggregates in Mortar

Setiadji¹,

Wibowo²,

Jonkers³

et al. 2022

IJTech

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Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates' abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.

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“…Under the same temperature condition, the dielectric properties of concrete will be different due to the change of the heating path (Li et al 2017;Soldatov et al 2016). It was found that the thermal response of coarse aggregate was different from mortar under microwave irradiation (Wei et al 2020a). The physical and mechanical properties of coarse aggregate produced by microwave were compared with those of coarse aggregate produced by other methods.…”

Section: Introductionmentioning

confidence: 99%

Study on Microwave-assisted Liberating Coarse Aggregate Based on the Coupling Method of Finite Element and Discrete Element

Liu

Chen³

et al. 2022

ACT

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A coupling method of finite element and discrete element was used to simulate the process of microwave liberating coarse aggregate under different power conditions, and it deals with the problem that the finite element method can not simulate the cracking process and the discrete element method can not consider the nonuniformity of microwave in the concrete specimens. The liberation ratio was proposed as the quantitative evaluation index, and the influence of microwave power on the liberating effect was analyzed based on the change of the liberation ratio. The mechanism of microwave-assisted liberation was discussed. It was found that the temperature distribution and crack distribution in the test specimens changed with irradiation time and microwave power; the optimal irradiation time and the optimal microwave power were obtained by liberation ratio under different irradiation conditions, and the simulation results were verified by preliminary tests; the coarse aggregate was under tension in both circumferential and radial, while the mortar is under compression in circumferential and under tension in radial under microwave irradiation. Cracks are produced by tensile stress at the junction of coarse aggregate and mortar, then the coarse aggregate are liberated from the mortar.

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Experimental study on thermal and mechanical behavior of mortar-aggregate under microwave irradiation

Cited by 12 publications

References 45 publications

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

Pyrolysis of Reclaimed Asphalt Aggregates in Mortar

Study on Microwave-assisted Liberating Coarse Aggregate Based on the Coupling Method of Finite Element and Discrete Element

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