Heating-Dominated Fracturing of Granite by Open-Ended Microwave: Insights from Acoustic Emission Measurement

Zheng, Yanlong; Ma, Zhongjun; Gong, Qiuming; Zhang, Penghai; Zhao, Xin; Li, Jianchun

doi:10.1007/s00603-022-02887-8

Cited by 12 publications

(2 citation statements)

References 48 publications

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“…Sketch of the microwave fracturing of the Bukit Timah granite blocks (revised from Zheng et al [2022])…”

Section: Methodsmentioning

confidence: 99%

“…With a 6 kW microwave system and a dielectric‐loaded converging waveguide antenna (DLCWA), Ma, Zheng, Zhao, Li (2022) found that the microwave‐induced cracks on the radiating surface were radial and the maximum crack opening and depth of the diorite specimen treated at 6 kW for 2 min reached 0.3 mm and 21 cm, respectively. Zheng et al (2022) used a 6 kW open‐ended microwave system to treat granite (25 cm × 25 cm × 25 cm) and found that cracks initiated from the edge of the antenna and propagated towards the edges and the interior of the specimens.…”

Section: Introductionmentioning

confidence: 99%

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Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

Zheng

et al. 2022

Deep Underground Science and Engineering

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Microwave fracturing of rocks before mechanical breakage could improve the performance of mechanical excavators and reduce environmental impacts. Previous research focused on the microwave fracturing of intact rock blocks.By using an open-ended antenna, this paper investigates the effect of pre-existing joints on the microwave fracturing of the Singapore Bukit Timah granite blocks. The results show that the specimens are weakened in the manners of cracking, spalling, melting, or a combination of them. The crack number and the total crack length produced by microwave treatment of jointed rock blocks are slightly smaller than those in the intact rock blocks. The interaction between joints and microwave-induced cracks can be summarized into the following four patterns:(1) microwave-induced cracks become arrested so that the crack propagation is terminated; (2) microwave-induced cracks penetrate the joints and continue to propagate; (3) microwave-induced cracks become deflected along the joints; and (4) microwave-induced cracks propagate forward following the joints. The smaller the approach angle between the microwave-induced crack and the preexisting joint is, the more microwave-induced cracks tend to be arrested at the joint. Increasing the approach angle between the microwave-induced crack and the joint can increase the chance of microwave-induced crack penetrating the joint. The results also show that the smaller the distance is between the microwave radiation point and the joint, the easier it is for microwave-induced cracks to penetrate the joints; otherwise, the microwave-induced crack is more likely to be arrested at the pre-existing joint.

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“…Sketch of the microwave fracturing of the Bukit Timah granite blocks (revised from Zheng et al [2022])…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

Zheng

et al. 2022

Deep Underground Science and Engineering

Self Cite

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Towards Microwave-Assisted Comminution of a Volcaniclastic Kimberlite: Permittivities, Heating Behaviour, and Grindability

Forster,

Le,

Mehr

et al. 2023

Proceedings of the 62nd Conference of Metallurgists, COM 2023

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Effect of Irradiation Spacing on Fracturing of Hard Rocks Using an Open-Ended Microwave Antenna

Zheng,

Ma,

Zhao

et al. 2024

Lecture Notes in Civil Engineering

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Heating-Dominated Fracturing of Granite by Open-Ended Microwave: Insights from Acoustic Emission Measurement

Cited by 12 publications

References 48 publications

Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

Effect of joints on microwave fracturing of the Bukit Timah granite using an open‐ended antenna

Towards Microwave-Assisted Comminution of a Volcaniclastic Kimberlite: Permittivities, Heating Behaviour, and Grindability

Effect of Irradiation Spacing on Fracturing of Hard Rocks Using an Open-Ended Microwave Antenna

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