Banca de DEFESA: MAURICEIA MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAURICEIA MEDEIROS
DATA : 19/12/2016
HORA: 09:00
LOCAL: Auditório CT
TÍTULO:

STUDY OF COATING MORTARS WITH WASTE SCHEELITE

PALAVRAS-CHAVES:

Mortar; waste; scheelite 

PÁGINAS: 85
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Construção Civil
ESPECIALIDADE: Processos Construtivos
RESUMO:

The state of Rio Grande do Norte has a large concentration of scheelite, the main source of tungsten, an important chemical element for production in various industries. When extracting the raw mineral material, tons of waste are generated and lunges in the environment. This work aims to analyze the use of this waste as a substitute for sand in the formulation of coating mortars, due to its favorable characteristics. Scheelite waste samples were collected in Brejuí mine, Currais Novos/RN, and after its initial characterization, it was observed the application of the thick residue in the mortars in study. Were analyzed mixing mortars by 1:1:6 and 1:3, both in volume with percentages of 0%, 25%, 50%, 75% and 100% of the sand replaced by scheelite thick waste. It was used Portland cement CP II-Z 32 and CH-I hydrated lime with ratio water/cement between 0.18 to 0.16 and a consistency of 260 ± 5mm. Subsequently, the mortars were analyzed in the fresh state through the consistency testing, bulk density, water retention and incorporated air content and in the hardened state by the compressive strength test and tensile strength in bending, bulk density, water absorption by immersion, water absorption by capillary and dynamic modulus of elasticity. The results showed a reasonable improvement in the properties of mechanical strength, dynamic modulus of elasticity and water retention of mortars produced with scheelite residue. However, some properties such as bulk density, water absorption by immersion and by capillarity presented results above what was found for reference mortars, causing heavier mortars, with less workability and more water absorption than reference mortars.

MEMBROS DA BANCA:
Presidente - 022.937.264-36 - ANDREZA KELLY COSTA NOBREGA - UFERSA
Externo à Instituição - ENIO FERNANDES AMORIM - IFRN
Interno - 1507841 - MARIA DAS VITORIAS VIEIRA ALMEIDA DE SA