Banca de DEFESA: JESSIKA MAYARA CLAUDINO IDALINO FRANÇA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JESSIKA MAYARA CLAUDINO IDALINO FRANÇA
DATE: 10/04/2026
TIME: 14:00
LOCAL: SALA 406 PGTEC
TITLE:

Impact of expanded vermiculite on the electrical permittivity of mortars.

KEY WORDS:

Signal Propagation; Electrical Permittivity; Lightweight Mortars; Wi-Fi Systems; Building Performance.

PAGES: 51
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

Microwave signal propagation characteristics, such as power loss and speed within buildings, significantly determine the operational performance of mobile devices in indoor environments. These characteristics are determined by the electrical properties of the walls that constitute the masonry of these buildings. The present study aims to experimentally evaluate the shielding effect of lightweight cement-based mortar rendering, with a 1:3 mass ratio (cement:sand), on microwave signal attenuation and the electrical properties of vertical sealing systems composed of ceramic blocks. For this purpose, masonry prisms were constructed with 2 cm thick lightweight cement-based mortar rendering, varying the percentage of sand substitution by vermiculite (0%, 25%, 50%, 75%, and 100%). The tests were conducted using non-destructive methods, specifically, the Nicolson-Ross-Weir (NRW) method in conjunction with the ray tracing method. Through the presented methodology and an extensive battery of tests utilizing frequency sweep instrumentation, experimental and theoretical data were collected to quantify Shielding Effectiveness (SE), complex relative permittivity, loss tangent, attenuation coefficient, and material conductivity of the materials over a broad frequency range, taking into account the different compositions of the mortars. The results indicate that an increase in vermiculite concentration led to a reduction in permittivity and the amount of signal dissipated by the masonry, resulting in lower microwave signal attenuation and reduced electromagnetic shielding performance.

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