Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Multifield coupling study on random aggregate concrete under microwave irradiation
Highlights Multi-field simulation for microwave heating concrete is performed. The secondary development of Matlab and COMSOL Multiphysics interface is applied. Microwave induced mortar-aggregate interface behavior is investigated.
Abstract Microwave-assisted concrete aggregate recycling is a new green technology with minute pollution and low energy generation during the heating process. In this study, a random aggregate concrete model is established based on a real industrial microwave heating system. The secondary development of a MATLAB and COMSOL Multiphysics interface is applied to realize a multifield coupled numerical analysis of the electromagnetic field, heat transfer field, and mechanical field of concrete under microwave irradiation. The model is validated by experimental tests. The results show that the dielectric loss is the main factor that influences the concrete temperature variation. Tensile stress and shear stress are generated at the mortar–aggregate interfaces. A high microwave energy input leads to significant temperature and stress gradients between the aggregates and the mortar. Compared to the aggregates, the mortar suffers a larger deformation in a microwave field, finally leadings to its damage. Thus, the investigation of the thermal responses of aggregates and mortars under microwave irradiation will provide reference for the further development of microwave-assisted concrete recycling technology.
Multifield coupling study on random aggregate concrete under microwave irradiation
Highlights Multi-field simulation for microwave heating concrete is performed. The secondary development of Matlab and COMSOL Multiphysics interface is applied. Microwave induced mortar-aggregate interface behavior is investigated.
Abstract Microwave-assisted concrete aggregate recycling is a new green technology with minute pollution and low energy generation during the heating process. In this study, a random aggregate concrete model is established based on a real industrial microwave heating system. The secondary development of a MATLAB and COMSOL Multiphysics interface is applied to realize a multifield coupled numerical analysis of the electromagnetic field, heat transfer field, and mechanical field of concrete under microwave irradiation. The model is validated by experimental tests. The results show that the dielectric loss is the main factor that influences the concrete temperature variation. Tensile stress and shear stress are generated at the mortar–aggregate interfaces. A high microwave energy input leads to significant temperature and stress gradients between the aggregates and the mortar. Compared to the aggregates, the mortar suffers a larger deformation in a microwave field, finally leadings to its damage. Thus, the investigation of the thermal responses of aggregates and mortars under microwave irradiation will provide reference for the further development of microwave-assisted concrete recycling technology.
Multifield coupling study on random aggregate concrete under microwave irradiation
Zhang, Pengju (Autor:in) / Wei, Wei (Autor:in) / Shao, Zhushan (Autor:in)
05.12.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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