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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 2
Study of the reuse of construction residues in concrete employed by blocks manufacture
aggregates by CDR;
E3 – a mix of concrete with 80% replacement of natural aggre-
gates by CDR;
E4 – a mix of concrete with 100% replacement of natural aggre-
gates by CDR;
Cylindrical concrete specimens were moulded, with dimensions
10 x 20 cm, for performing the following tests: determination of
compressive strength (NBR5739:2007 [16]), tensile strength by
diametrical compression (NBR7222:1994 [17]) and determination
of water absorption by immersion (NBR9778:2009 [18]). Concrete
blocks were also made using vibro - presses. The size of con-
crete blocks selected were 14x19x39 cm (Figure 4). The blocks
were submitted to tests to determine the compressive strength
and water absorption capacity, as in NBR12118:2007 [19].
the granulometric composition as seen on NBR7211:2009 [15]. The
tests results obtained are described in Table 1.
Selection of dosages of Concrete with and without CDW
The mix proportions of concrete, in mass, selected for this study
was: 1:3,5:3,0:2,5:0,80 (cement: fine sand, medium sand: gravel:
water). From the mix proportion considered as reference concrete
were produced with increasing incorporation of CDW in substitu-
tion of aggregates in the following proportions:
E0 – reference concrete mixture;
E1 – a mix of concrete with 20% replacement of natural aggre-
gates by CDW;
E2 – a mix of concrete with 50% replacement of natural
Figure 1 – Civil Construction Waste
Figure 2 – Recycled fine aggregate
Figura 3 – Recycled coarse aggregate
Figura 4 – Moulded Concrete Blocks