Banca de DEFESA: LUZARTT PEREIRA BARROSO COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : LUZARTT PEREIRA BARROSO COSTA
DATE: 22/08/2025
TIME: 14:00
LOCAL: meet.google.com/apt-msxs-nvk
TITLE:

INFLUENCE OF HYDROXYPROPYL METHYLCELLULOSE ON THE THERMO-MECHANICAL PROPERTIES OF LIGHTWEIGHT MORTARS WITH SAND REPLACED BY EXPANDED POLYSTYRENE POWDER

KEY WORDS:

Lightweight mortar, thermal insulation, energy efficiency, EPS, HPMC

PAGES: 21
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

With the growing demand for energy efficiency, the construction industry has encouraged the adoption of innovative materials capable of reducing energy consumption, especially in coatings applied to building envelopes. One promising alternative is the incorporation of industrial waste, such as expanded polystyrene (EPS) powder, into mortars. In addition to contributing to sustainability by preventing improper disposal of this waste, EPS can act as a lightweight aggregate, whose polymeric nature reduces the material's mass density and improves thermal and acoustic insulation due to its porous morphology. In this study, a reference mortar with a 1:3 ratio (cement:sand) was formulated, partially replacing natural sand with EPS powder in proportions of 10%, 20%, 30%, 40%, and 50%, to evaluate the impact of this change on mechanical and thermal properties with and without the use of hydroxypropylmethyl cellulose (HPMC) at 0.20% of the cement mass. Tests were performed in the fresh and hardened states to characterize the mechanical and thermal properties, as well as microstructural analyses by scanning electron microscopy (SEM). The formulation with 50% EPS and HPMC showed a 33.38% increase in thermal insulation compared to the same composition without HPMC and a 133.49% increase compared to the reference mortar. The results indicate that HPMC enhances thermal performance by inducing greater porosity in the matrix, which, in turn, compromises the material's mechanical strength.

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