TITLE:
Influence of Silica Fume on the Reflectivity and Transmission Efficiency of Cement-Based Materials
AUTHORS:
Xiuzhi Zhang, Guodong Zhang, Yu Zhang, Zonghui Zhou
KEYWORDS:
Silica Fume, Cement-Based Materials, Reflectivity, Transmission Efficiency
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.2 No.9,
August
22,
2014
ABSTRACT: As a kind of mineral admixture, silica fume
has low permittivity, which will affect the electromagnetic properties of cement-based
materials. To study the effect of silica fume on the properties of cement-based
materials, the reflectivity, transmission efficiency and pore structure were analyzed
by using the vector network analyzer and mercury injection apparatus. Results
show that silica fume can make the mortar more compact and the porosity
of sample with 9% silica fume is only 17.8%, which is far lower than the control
sample; With the increase of the silica fume content, the peak of reflectivity
curve increases from -23.2 dB to -16.0 dB, and then decreases from -16.04 dB to
-28.7 dB in the frequency range of 6 – 18 GHz. Reflectivity of sample with 3%
content of silica fume is lower than other samples within 26.5 - 40 GHz; Transmission
efficiency of samples shows the trend of increase with silica fume content
increases from 0% to 6% within 8.2 - 12.4 GHz, 12 - 18 GHz and 26.5 - 40 GHz,
but when the content increases from 6% to 9%, the transmission efficiency of
samples reduces.