Banca de DEFESA: Ricardo Perim Real

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : Ricardo Perim Real
DATA : 21/02/2018
HORA: 14:00
LOCAL: Centro Federal de Educação Tecnológica de Minas Gerais
TÍTULO:

Assessment of the use of rice husk ash as a mineral admixture in high performance concrete.

PALAVRAS-CHAVES:

Key-Words: High performance concrete, rice husk ash, properties, durability, chemical additives, mineral admixtures, microstructure.

 

PÁGINAS: 78
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
SUBÁREA: Estruturas
ESPECIALIDADE: Estruturas de Concreto
RESUMO:

High performance concrete (HPC) is a special type of concrete that has better mechanical properties and durability over conventional concretes, without damaging the material properties in its fresh state (workability). In addition to the traditional components of the concrete, when producing HPC, mineral admixtures and chemical additives are used to improve the microstructure of the material and ensure good workability even at lower water/cement ratios. Rice husk ash (RHA) is an agricultural residue whose use as a mineral admixture in concrete has been studied and explored recently. The theoretical review presented in this study shows the great amount of studies developed by the scientific community on the use of this agricultural byproduct. In order to evaluate this use, the present study proposes a series of tests that will be performed on cylindrical specimens (10 x 20 cm) of HPC with levels of cement substitution by the residue of 10% to 20% by mass. The tests will evaluate the behavior of the concrete in its fresh state (slump test) and in its hardened state (modulus of elasticity, compressive strength, water absorption, mercury intrusion porosimetry and rapid chloride permeability test), in order to investigate rheological, mechanical and durability properties. A pilot study, whose results are presented in this qualification proposal, performed the physicochemical characterization of the HPC constituent materials, with emphasis on mineral admixture (chemical composition, granulometry, density, surface area, morphology and mineralogical composition). In addition to this characterization, preliminary tests (slump test, modulus of elasticity and compressive strength) were performed in specimens with the same dosage as those that will be produced in the final study, however, with the use of plasticizer additive and upper water/cement ratio. The results were satisfactory and indicate the behavior expected of the concrete in the final study, when a superplasticizer additive and a lower water/cement ratio will be used.

MEMBROS DA BANCA:
Interno - CONRADO DE SOUZA RODRIGUES
Interno - FLAVIA SPITALE JACQUES POGGIALI
Externo à Instituição - JOÃO BATISTA SANTOS DE ASSIS - PUCMinas
Presidente - NILTON DA SILVA MAIA