Banca de DEFESA: ZODINIO LAURISA MONTEIRO SAMPAIO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : ZODINIO LAURISA MONTEIRO SAMPAIO
DATA : 25/04/2017
HORA: 10:00
LOCAL: Auditório do Laboratório de Cimentos da UFRN
TÍTULO:

Structural lightweight concrete formulation with residues and low consumption of cement

PALAVRAS-CHAVES:

Structural lightweight concrete; porcelain tile polishing residue; tire rubber residue. Limestone residue

PÁGINAS: 114
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

The high-energy demand involved in the construction industry and the increasing consumption of concrete made this material an ideal option for the recycling of by-products from various industries such as: porcelain polishing residue (PPR); Tire rubber residue (TRR) and limestone residue (LSR). These residues often lack a treatment that will contribute to the degradation of the environment. Lightweight concrete (LWC) has been used in civil construction due to its benefits, which include: reducing the concrete's dead weight; increase of useful area; handling and less costly transport operations; Increased thermal and acoustic insulation and fire resistance. In the production of lightweight concrete, usually part or all of the aggregates are replaced by lightweight aggregates such as expanded clays (EC), TRR, pome stone, expanded vermiculite and others. LWC usually consume more cement because of the low strength of porous aggregates used in manufacturing. In this sense, the use of by-products that will increase the volume of the concrete without damaging the properties, can be a viable option in the production of low cost and sustainable LWC. The general objective of this work was to analyze the mechanical and thermal behavior of structural lightweight concrete (SLWC) produced with EC in replacement of the aggregate and with the addition of PPR, TRR and LSR to replace the small aggregate. And finally create a low-cost SLWC with good mechanical properties with minimal cement consumption. For this purpose, a 2³ factorial design was used for the choice of SLWC with the best performance in terms of consistency, mechanical properties and density. Subsequently, reductions of 10, 20 and 30% of cement were performed on SLWC that presented better performance and were characterized by mechanical tests. The best SLWC mix resulting from the combination of mechanical properties and cement consumption was characterized by: permeability tests; Flexural strength; TG/DTA; XRF; XRD; SEM; Thermal capacity; Thermal conductivity and thermal diffusivity. Finally, an economic analysis of the feasibility of the use of SLWC obtained with the reduction of cement was carried out. The results showed that residues contents around 21% presented better combination of properties. By maintaining the amount of residue at optimum levels it was possible to produce an economically viable CLE with good rheological, mechanical and thermal properties with a minimum cement consumption.

MEMBROS DA BANCA:
Presidente - 1298936 - ANTONIO EDUARDO MARTINELLI
Externo ao Programa - 1804366 - JULIO CEZAR DE OLIVEIRA FREITAS
Externo ao Programa - 671.403.354-00 - KLEBER CAVALCANTI CABRAL - UFERSA
Externo à Instituição - SANDRO MARDEN TORRES - UFPB
Externo à Instituição - ULISSES TARGINO BEZERRA - IFPB