Crack damage evolution in concrete coarse aggregates under microwave‑induced thermal stress

Yuan, Yuan; Shao, Zhushan; Qiao, Rujia; Guo, Xuan; Wang, Weitao

doi:10.1007/s43452-022-00419-3

Artykuł - szczegóły

Tytuł artykułu

Crack damage evolution in concrete coarse aggregates under microwave‑induced thermal stress

Autorzy

Yuan Yuan , Shao Zhushan , Qiao Rujia , Guo Xuan , Wang Weitao

Wybrane pełne teksty z tego czasopisma

http://www.springer.com/journal/43452

Identyfikatory

DOI

10.1007/s43452-022-00419-3

Warianty tytułu

Języki publikacji

Abstrakty

Coarse aggregates of waste concrete can be efficiently separated from mortar under microwave irradiation. However, the microwave-induced damage in aggregates are restricting mechanical properties of the aggregates for replacing natural aggregates. Since damage evolution in rocks treated by microwave are influenced by mineralogy and microwave operating parameters, such as power and irradiation time, understanding the microwave weakening mechanism of rocks is necessary to assess and control the damage of aggregates for recovery of high-quality concrete coarse aggregates. This article develops an approach for evaluating crack damage evolution in aggregates exposed to microwave by combining theoretical analysis with experimental investigation. A theoretical heat source-matrix model based on electromagnetic and thermal properties of mineral components is established for microwave heated aggregates. Substituting microwave irradiating parameters and mineralogy of the aggregates into the model, corresponding temperature fields and thermal stress fields are solved. Cracks in aggregates after microwave exposure are observed using scanning electron microscopy (SEM) and quantified in terms of crack length, density and intensity. Crack damage varied with microwave energy is assessed by crack length and density. Crack propagation is further discussed by contrast of stress intensity factor (SIF) at the crack tip and fracture toughness of the aggregate. Cracking behavior analyzed by SIF of cracks is consistent with that obtained from quantitative analysis on SEM images. The results suggest that granite shows a stronger resistance to thermal stress damage compared with basalt under microwave exposure, and a multistage microwave treatment should be adopted for recovery of various aggregates.

Słowa kluczowe

concrete coarse aggregate microwave heating thermal stress cracking behavior damage evolution

kruszywo betonowe ogrzewanie mikrofalowe naprężenie termiczne

Wydawca

Springer
Wrocław University of Science and Technology

Czasopismo

Archives of Civil and Mechanical Engineering

Rocznik

2022

Tom

Vol. 22, no. 3

Strony

art. no. e108

Opis fizyczny

Bibliogr. 57 poz., rys., tab., wykr.

Twórcy

autor

Yuan Yuan

yuanyuan@xauat.edu.cn

School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
Postdoctoral Station of Architecture, Xi’an University of Architecture and Technology, Xi’an 710055, China

autor

Shao Zhushan

shaozhushan@xauat.edu.cn

School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

autor

Qiao Rujia

School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China

autor

Guo Xuan

School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

autor

Wang Weitao

School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023)

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-919db253-eda0-44d7-a0a9-3412cc56285b