Banca de DEFESA: RAQUEL FERREIRA DO NASCIMENTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RAQUEL FERREIRA DO NASCIMENTO
DATE: 01/11/2021
TIME: 15:00
LOCAL: https://meet.google.com/ycn-nftv-sri
TITLE:

EFFECT OF HYDROXYPROPYLMETHYLCELLULOSE ON LIGHT THERMAL MORTARS BASED ON EXPANDED VERMICULITE

KEY WORDS:

Thermal insulation, low density, HPMC, vermiculite.

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

Insulating and low-density cementitious materials have been increasingly studied in order to improve thermal insulation conditions in buildings and the possibility of reducing the weight of buildings. One of the ways to develop this type of material is through the use of light aggregates or additives that allow the incorporation of air. Thus, the present study aims to verify the influence of the use of Hydroxypropylmethylcellulose (HMPC) on the thermal and mechanical properties of light mortars based on expanded vermiculite, with replacement of sand by light aggregate in the proportions of 0%, 20%, 40 %, 60% and 100%, for sets of mortars with and without HPMC. To determine the properties of the fresh and hardened state of the mortars, the tests of compressive strength and tensile strength in bending, water absorption by immersion, mass density, modulus of elasticity and water loss by evaporation were performed. The thermal performance was obtained through the simplified method of NBR 15575-3 (ABNT, 2013) and through a simulator. The results indicate that the incorporation of HPMC causes an increase in the material's void index, promoting a reduction in mechanical strength and elastic modulus. This fact does not constitute an obstacle to its use, because, for a coating mortar, it is important to have flexibility in order to acquire a greater possibility of absorbing deformations. It is also noted that the incorporation of HPMC produces a mortar with lower mass density, reflecting in a lighter material with high thermal insulation capacity, in such a way that the 100% vermiculite composition can insulate approximately 20°C, while the complete system (mortar+brick+mortar) insulates approximately 43ºC, values that are higher when compared to the mortar without HPMC. Thus, it is concluded that the incorporation of HPMC allowed an increase in thermal insulation in light mortars based on vermiculite, due to the increase in the void ratio provided by this additive, directly influencing the mechanical properties of the material.

BANKING MEMBERS:
Presidente - 671.403.354-00 - KLEBER CAVALCANTI CABRAL - UFERSA
Interna - 1717461 - LUCIANA DE FIGUEIREDO LOPES LUCENA
Interno - 022.621.844-96 - MARCOS ALYSSANDRO SOARES DOS ANJOS - IFRN
Externo à Instituição - WENDELL ROSSINE MEDEIROS DE SOUZA - UFERSA