INFLUÊNCIA DE ADIÇÕES MINERAIS POZOLÂNICAS E DE FINOS DE PEDREIRA NAS PROPRIEDADES MECÂNICAS E NA MICROESTRUTURA DO CONCRETO AUTO-ADENSÁVEL
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Data
2007-08-27
Autores
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Universidade Federal de Goiás
Resumo
For the benefits of its properties in fresh state, self-compacting concrete
(SCC) demands a high powder content in the composition, nearby 450kg/m³. The
quarry dust, resultant material of the coarse aggregate production, can b considered
as an economic and sustainable alternative for the development of the SCC.
As well as the quarry dust, mineral additions, is used in conventional
concretes and can also be used in the self-compacting concrete, with the same kind
of benefits.
Using the mix design for SCC developed by Tutikian (2004) a study for
evaluation of the SCC mechanical properties were done, where natural sand had
been partially replaced by quarry micaschist, granite and gneiss - and cement for
silica fume, metakaolin and calcined clay pozolan.
The test methods for fresh state used was Slump-flow (FURNAS, 2005a),
U-Box (FURNAS, 2005b), Entrained air (NM 47, 2002) and Specific gravity (9833,
1997). Cylindrical test specimen 100x200 mm had been molded for tests -
compressive strength (NBR 5739, 1994), modulus of elasticity (NBR 8522, 1984),
splitting tensile strength (NBR 7222, 1994) and flexural strength (NBR 12142, 1991) -the age of 28 days. Samples using the mixture1: 4,5 had been analyzed by
scanning electron microscope (SEM).
The results show that it can be possible the use of different additions for
the production of high quality SCC. We detach the small variability of the specific
gravity, as well as the entrained air, wide presented low values.
For concretes with same compressive strength, the values of modulus of
elasticity had varied between 5 and 60% and the splitting tensile strength and flexural
strength had been remained between 10 and 15%
Descrição
Palavras-chave
Adições minerais , concreto auto-adensável , finos de pedreira , microestrutura , propriedades mecânicas , mechanical properties , microstructure , mineral additions , quarry dust , self-compacting concrete , 1. Concreto - Adição mineral 2. Concreto auto-adensável
3. Concreto Propriedades mecânicas 4. Microestrutura
Citação
ARAÚJO, Janaína das Graças. Influence of the mineral additions and the quarry dust in the
mechanical properties and the microstructure of the self-compacting concrete. 2007. 171 f. Dissertação (Mestrado em Engenharias) - Universidade Federal de Goiás, Goiânia, 2007.