Influence of Microwave Absorbing Coating on Concrete Microwave Deicing Property
As a new deicing method,microwave deicing technology has the advantages of high deicing rate,green and pollution-free,however,the microwave deicing efficiency has become the key to restrict the application of this technology.In order to improve the microwave deicing efficiency of concrete,a certain amount(0,3%,6%,9%,12%,15%)of 3 kinds of microwave absorbing admixtures(Fe3O4,SiC,graphite)are mixed into the coating bonding solvent to prepare the microwave absorbing coating of concrete.The open microwave emission system is used to carry out ice-free temperature rise test and microwave deicing test on concrete coated with absorbing coating.The effect of microwave absorbing coatings on concrete microwave heating efficiency and microwave deicing property are studied,and the influence of different absorbing coatings on concrete microwave deicing property are compared and analyzed.The result shows that(1)Fe3O4 microwave absorbing coating,SiC microwave absorbing coating and graphite microwave absorbing coating can increase the heating rate of concrete surface,and improve the microwave heating efficiency and microwave deicing property of concrete;(2)with the increase of the amount of absorbing admixture,the heating rate of the concrete specimen surface first increases and then decreases;(3)the optimum contents of Fe3O4,SiC and graphite are 9%,9%and 12%respectively,and graphite absorbing coating has the best improvement effect on microwave heating efficiency and microwave deicing property of concrete,followed by Fe3O4 absorbing coating and graphite absorbing coating;(4)with under the optimal contents,the microwave heating efficiency of concrete with Fe3O4 absorbing coating,SiC absorbing coating and graphite absorbing coating increase by 148.73%,81.8%and 156.95%respectively,and the microwave deicing property of concrete increase by 129.62%,67.12%and 245.11%respectively.
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