Banca de DEFESA: SIMONE TAIANE GAMELEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : SIMONE TAIANE GAMELEIRA
DATE: 29/08/2025
TIME: 14:00
LOCAL: A definir
TITLE:

INFLUENCE OF COATING THICKNESS ON THE ELECTRICAL PROPERTIES OF MASONRY PRISMS IN THE MICROWAVE RANGE

KEY WORDS:

Microwave propagation; electrical permittivity; signal attenuation; electrical conductivity; cement mortar coating

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

The electromagnetic performance of vertical sealing systems in buildings has become a growing concern given the increased demand for wireless connectivity in indoor environments. Masonry, traditionally studied from a mechanical and thermal perspective, also plays a significant role in the propagation and attenuation of radiofrequency signals, especially in the microwave range, where various communication technologies, such as Wi-Fi and Bluetooth, operate. In this context, understanding how mortar coatings influence the electromagnetic behavior of these systems is crucial for developing construction solutions that combine construction performance and signal efficiency. Therefore, this study seeks to experimentally evaluate the effect of a cement-based mortar coating with a 1:3 ratio (cement:sand) on the attenuation of microwave signals and the electrical properties of vertical sealing systems composed of ceramic blocks. For this purpose, masonry prisms with 1 cm, 2 cm, and 3 cm cement-based mortar coatings were constructed and subjected to laboratory analysis using electromagnetic characterization techniques in the microwave range. The tests were conducted using a nondestructive method, using the Nicolson-Ross-Weir (NRW) method and the ray tracing method. The tests provided characterization of the materials and mortar used, as well as calculated and experimental data on shielding effectiveness (SE), complex relative electrical permittivity, loss tangent, signal attenuation coefficient, and electrical conductivity for a wide frequency range (0.9 GHz to 5.0 GHz), considering different coating thicknesses. Specifically, walls coated with a thicker cement-based mortar in the material proportions studied exhibited higher electrical conductivity and dielectric loss values, reinforcing the role of the coating in reducing the propagation of electromagnetic waves through masonry. The results indicate that increasing the coating thickness increases the permittivity and the amount of signal dissipated by the masonry, leading to greater attenuation of microwave signals and improved electromagnetic shielding performance. This research contributes to the understanding of the dielectric properties of ceramic block masonry and offers technical support for the development of more efficient construction guidelines, supporting the electromagnetic performance, connectivity, and sustainability requirements of modern civil engineering.

COMMITTEE MEMBERS:
Presidente - ***.403.354-** - KLEBER CAVALCANTI CABRAL - UFERSA
Interna - 1507841 - MARIA DAS VITORIAS VIEIRA ALMEIDA DE SA
Externa à Instituição - RÍSIA AMARAL ARAÚJO - IFRN