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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 2
R. C. C. Lintz | A. E. P. G. A. Jacintho | L. L. Pimentel | L. A. Gachet-Barbosa
sive strength and tensile strength by diametrical compression for
the cylindrical specimens, at 28 days. Figures 7 and 8 show the
results from the compression tests of concrete blocks, at 14 and
28 days. Figures 9 and 10 show the rates of water absorption by
immersion for the cylindrical specimens and values of water ab-
sorption capacity of concrete blocks, respectively. Both absorption
tests were performed at 28 days of curing.
Through the analysis of data from the characterization tests, it was
observed that the natural aggregates have higher specific and sin-
gle densities than the recycled aggregates, confirming the results
The mixture was made in intermittent concrete mixer of inclined
axis (NBR5738:2008 [20]), and later the specimens were moulded
on the vibrating table and cured, submerged in a tank of saturat-
ed water with lime, for 28 days, according to the specifications of
NBR5738:2008 [20]. After curing, the cylindrical specimens were
rectified for execution of the tests and the blocks capped.
3. Results and discussion
Figures 5 and 6 show the results obtained from tests for compres-
Table 1 – Physical characterization of aggregates
Material
Specific
mass (Kg/l)
Unitary
Mass (Kg/l)
Maximum dimension
Feature (mm)
Fineness
Modulus
Granulometric
Qualification
Natural
Fine
aggregate
2,62
1,47
2,4
1,93
zone 2
fine sand
Natural
Fine
aggregate
2,90
1,63
4,8
2,74
zone 3
medium sand
Natural
Coarse
aggregate
2,86
1,64
9,5
6,67
gravel 0
Natural
Fine
aggregate
2,34
1,33
4,8
2,38
zone 3
recycled
medium sand
Natural
Coarse
Aggregate
2,55
1,46
9,5
3,36
recycled 0
gravel
Figure 5 – Results of average compressive
strength of cylindrical specimens
Figure 6 – Results of tensile strength by average
diametrical compressive of cylindrical specimens