Transmission rate of electromagnetic wave in concrete material surface

By establishment of basic theoretical model of electromagnetic wave propagation on concrete material surface,relationship of transmission rate and concrete electromagnetic parameters was analyzed.Concrete material specimens were casted under laboratory condition and tested by electromagnetic pulse experimental apparatus.Effect and influence law of different concrete components and ages to the electromagnetic wave transmission were studied by the test result.Research shows that transmission rate in concrete material surface is only relevant with the material dielectric parameter.The greater concrete relative dielectric constant is,the smaller transmission rate in surface is.Among the concrete casting components,unit volume water content has the most obvious influence on transmission rate.The greater unit volume water content is used,the smaller transmission rate is at different ages.When concrete age is before 20d,transmission rate is growing with age rapidly;after 20d,transmission rate will be maintained at a stable value.