Influence of Microwave-absorbing Material on Mechanical Property and Heating Characteristics of Cement Mortar
Aiming at the current research gap concerning the unclear impact of microwave-absorbing materials on the heating characteristics and mechanical properties of microwave-absorbing mortar,the optimal choices,such as iron powder,graphite,carbon fiber,steel fiber and magnetite powder,are selected for absorptive materials,and microwave-absorbing mortar is prepared.Combining with the use of infrared thermal imaging and cyclic microwave heating methods,the mechanical strength,heating characteristics,temperature field distribution and microwave cyclic durability performance of absorptive mortar composed of different materials are studied.The result shows that(1)Carbon fibers have the optimal effect on improving the microwave heating characteristics of mortar,the addition of a small amount of carbon fiber significantly enhances the heating properties of microwave-absorbing cement mortar,and 1.5%carbon fiber content is able to increase the heating rate of cement mortar by 1.59 times.(2)Graphite and steel fibers also improve the heating characteristics of mortar effectively,1.5%content of graphite and steel fibers are able to increase the heating rate of cement mortar by 1.19 and 1.16 times respectively.(3)Different types of microwave-absorbing materials have various impacts on the mechanical properties of cement mortar,and the incorporation of iron powder decreases the flexural strength of mortar;the addition of graphite improves the flexural strength of cement mortar,but the degree of improvement decreases with increasing graphite content;steel fibers increase the strength at lower proportions;whereas the flexural strength of carbon fiber microwave-absorbing cement mortar increases with the addition of carbon fiber,and 1.5%carbon fiber content is able to improve the flexural strength of cement mortar by 1.13 times.(4)The study shows that among the various microwave-absorbing materials selected,carbon fibers can simultaneously enhance the microwave heating properties and mechanical strength of mortar,as well as provide good microwave cycling durability,making it suitable as a microwave-absorbing additive material for de-icing road surfaces.
road engineeringmechanical strengthtemperature field optimizationmicrowave-absorbing concreteheat conducting material
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