Dielectric Properties Of Concrete Research Articles

Effect of local sand ratio toward compressive strength and dielectric properties of concrete

In this work, we report the effect of local sand ratio on compressive strength and dielectric properties of concrete. Concretes were made by mixing Portland cement mixed with local sand in various compositions of 1:2, 1:3.1:4.1:5, 1:6, and 1:7. These mixtures were printed in the form of 5×5×5 cm3 and have maintained (soaked) for 27 days. Specimens were characterized on the 28th day. Compressive strength was tested using the compression test and dielectric test with a series LCR meter. The compressive strength test results show that the more significant sand addition in the mixture decreases the compressive strength. Dielectric test results reveal that the higher addition of sand in the mixture reduces the dielectric constant. These results indicate that the dielectric constant measurement can be used as an alternative method for the investigation of concrete quality.

Kinetic Study of Portland Cement Hydration with Ground Penetrating Radar

The variations of dielectric constant and the amplitude of reflected EM wave of concrete during the first 3 days are measured with Ground Penetrating Radar (GPR) at 20 oC. The amplitude decreases sharply after mixing with water, and then increases till a stabilized stage, followed by a gradual decline. The relative dielectric constant decreases with increasing hydrating time. The results show that the dielectric properties of concrete can be used as an effective way of studying the kinetics of concrete setting and hardening process at early ages.