AMORIM, L.V.; http://lattes.cnpq.br/7209301206982076; AMORIM, Luciana Viana.
Resumo:
The constant looks for alternative materials of low cost and good
mechanical properties, besides the ecological problems, caused by the growing
of solid volume residues from civil construction industry, motivated the
development of this work. The main objective of this work is to study the
influence of specific area of rejects of ceramic industry and waste of civil
construction in the system pozzolana-lime, also to obtain alternative cement of
low cost.
For this purpose, two samples of lime (hydrated lime), two samples of
rejects (waste from civil construction), one sample from rejects of bricks and
tiles (from the industry) and one sample of artificial pozzolana (as reference)
were selected. All sample were characterised by chemical analysis, thermal
differential analysis, thermogravimetry and X-ray diffraction. The wastes
samples and ceramic residue were ground in a ball mill for periods of 10, 30, 60
and 90min, while the sample of artificial pozzolana, was ground in a disk mill,
with different opening between the disks, to obtain different specific areas,
determined by the Blaine method.
The pozolanic activity, as function of the specific area of the rejects and
the pozzolanics materials, was evaluated through the consumption of lime,
index of pozzolanic activity with lime and simple compression strength (for
mortars of lime pozzolana cement). Those mortars were prepared in the
proportion of 1:3 (one part of lime pozzolana cement, and three parts of
standard sand), in the normal consistency and in the compositions of 30-70%,
40-60% and 50-50% of lime and pozzolana. The specimens were cured for
periods of 7, 28 and 60 days. Additionally, it was made a statistical analyses of
the results, through simple linear correlations, to verify the correlation degree
between the specific area (of the rejects and pozzolanics materials) and the
mechanical properties of the mortars prepared with these materials.
The obtained results shown the specific area of ceramic rejects and
wastes from the civil construction has a great influence in the pozzolanic
properties.