Banca de DEFESA: PLINIO CAMPOS DE ASSIS NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PLINIO CAMPOS DE ASSIS NETO
DATE: 27/04/2023
TIME: 09:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Use of Vermiculite in the composition of the inert fraction of Mortars: Study of the anhydrous, fresh,hardened and thermal properties of Mortars

KEY WORDS:

Lightweight mortar. Fine aggregate. Fine vermiculite. Superfine vermiculite. Thermal performance.

PAGES: 123
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The climate changes caused by industrial activities have been generating thermal discomfort in the world population, thus the search for air conditioners is increasing steadily. However, the use of these devices leads to higher energy consumption in buildings. Therefore, public policies have been created to establish minimum parameters to improve the thermal performance of buildings, such as Law No. 10.295 and NBR 15.575/2013. The construction industry constantly seeks solutions to meet the requirements of these laws, one of the possibilities is the use of cementitious composites with low specific weight, such as thermal mortars, which reduce the heat flow of a sealing element between two environments, this allows reducing the use of cooling equipment.  Studies on thermal mortars suggest the use of vermiculite in mortars as a solution to reduce heat flow in walls, however vermiculite is a lightweight aggregate with high water absorption, the use of it in coating mortars causes a loss of workability compared to traditional mortars. Given this, this study sought to analyze the particle size composition of the inert fraction of mortars produced with vermiculite and the influence of this parameter on the anhydrous, fresh, hardened and thermal properties. Through the state of the art study, the basic trait of this research and the percentages of vermiculite used were determined, thus the mortars produced in this study presented a trait 1:1:6 (cement: lime: aggregate) in volume and the sand was partially replaced by vermiculite in the proportions of 20%, 40% and 60%, and the influence of particle size and hydration state of the lightweight aggregate was evaluated, for this purpose vermiculites with fine and super fine particle size grading were used, and in the dry and wet state. Based on the properties of the materials used, the consumption in mass for each component of the mortars was found, and the amount of water was determined from the spread obtained on the consistency table. In the fresh state the water consumption required to obtain a 260 ± 5 mm spread, incorporated air content, density in the fresh state, and water retention were studied. In the hardened state, mechanical resistance, water absorption by capillarity, bulk density, void index, thermal conductivity, heat transfer rate and thermal transmittance were evaluated. Based on the results collected, the mortar with 60% super fine dry vermiculite stands out as having the most satisfactory thermomechanical performance.

 

COMMITTEE MEMBERS:
Presidente - 1152919 - ARNALDO MANOEL PEREIRA CARNEIRO
Externa ao Programa - 1492780 - ERIKA PINTO MARINHO - nullExterno à Instituição - JOSE GETULIO GOMES DE SOUSA - UNIVASF
Externa à Instituição - KAROLINE ALVES DE MELO MORAES - UFAL