Effects of water-cement ratio,sand rate and carbon nanofiber on microwave heating properties of concrete
The effects of the basic parameters of concrte on its microwave heating properties were studied by adjusting the water-cement ratio and sand rate,and the influence degree of water-cement ratio and sand rate on the mechanical properties and microwave heating properties of concrete were compared and analyzed.In order to improve the microwave heating properties of concrete,the effect of carbon nanofiber on the heating rate,temperature distribution and deicing efficiency of concrete were studied.Through dielectric constant test and resistivity test,the influence mechanism of carbon nanofiber was analyzed.The results show that the microwave heating properties of concrete are improved with the increase of water-cement ratio and sand ratio.Compared with the water-cement ratio,the change of sand rate has a greater effect on the microwave heating properties of concrete.The influence of changing sand rate on the microwave heating property of concrete is more significant than that on the mechanical property.By increasing the dielectric constant of concrete and reducing the resistivity of concrete,the carbon nanofiber enhances the dielectric loss and resistance loss ability of concrete,and then improves the microwave heating properties of concrete.The larger the carbon nanofiber content,the better the microwave heating properties of concrete.
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