STUDY ON RADIO WAVE TRANSPARENCY IMPROVEMENT OF CONCRETE FOCUSING ON INTERNAL WATER CONTENT

Abstract

 This study investigates the radio wave transparency of different types of concrete and the influencing factors, and finds the conditions that improve radio wave transparency. The goal is to actively control the radio wave propagation environment through the physical properties of the concrete itself, rather than through communication devices. The study begins by reviewing the theoretical equation for electromagnetic wave propagation in concrete and the water form in concrete. It then discusses the effect of water on radio wave transparency. Radio wave transparency tests were conducted on plate specimens with controlled internal water content. The results confirmed that reducing the evaporable water by low water-powder ratio alone did not improve the radio wave transparency. However, simultaneous reduction of evaporable and non-evaporable water using geopolymer instead of cement paste in addition to low water-powder ratio greatly improved the radio wave transparency.