Banca de DEFESA: OTAVIO JOAQUIM DA SILVA JUNIOR

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : OTAVIO JOAQUIM DA SILVA JUNIOR
DATE: 16/02/2023
TIME: 14:30
LOCAL: Pós-Graduação em Engenharia Civil
TITLE:

Influence of Physical and Mechanical Properties on Sound Insulation of Gypsum Block

KEY WORDS:

Gypsum paste, Gypsum block; Composites, Sound insulation.

PAGES: 159
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The sound insulation of vertical fences against airborne noise is a function of their internal properties, such as density, stiffness and damping, and increasing sound insulation requires knowledge of these properties and their influence on microstructural behavior. This research aims to characterize the physical, mechanical and microstructural properties of the gypsum paste, and the acoustic properties of seals made with precast gypsum blocks, produced with gypsum and additions of natural perlite, expanded perlite, vermiculite and alumina, being correlated the internal properties of the materials with their sound insulation capacity. The analysis of the acoustic properties was extended to two specific conditions, double walls with elastic separation and composite block with stone wool plate. The acoustic characterization of the plaster blocks was carried out by tests of structural reverberation time and sound reduction index (R). The composites directly affected the mechanical properties of the plaster block, reducing its density and, consequently, its mechanical capacity. The granular additions, expanded perlite and vermiculite, suffered the greatest reductions, reaching losses of 50% in compressive strength. The microstructural changes, observed in the scanning electron microscope (SEM), were perceptible when the water/plaster ratio was modified, with the increase in the water/plaster ratio providing a greater spacing between the crystals, making them thinner and elongated. The acoustic analysis showed that the application of viscoelastic material between the walls significantly contributes to reducing the structural reverberation time, directly affecting the critical frequency and contributing to an increase in the sound reduction index. The sound insulation of the composite blocks of vermiculite and alumina showed the highest efficiency in sound insulation capacity, promoting gains of up to 20% with only 5% of addition. This work is expected to contribute to the production of plaster blocks with greater acoustic efficiency, providing the civil construction market with alternatives to guarantee the necessary acoustic insulation.

COMMITTEE MEMBERS:
Presidente - 1152919 - ARNALDO MANOEL PEREIRA CARNEIRO
Externa à Instituição - STELAMARIS ROLLA BERTOLI - UNICAMP
Externo à Instituição - MARCO ANTONIO SILVA PINHEIRO - UFSM
Externa à Instituição - YÊDA VIEIRA PÓVOAS - UPE
Externo à Instituição - ÂNGELO JUST DA COSTA E SILVA - UPE