Basic HTML Version
711
IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 5
E. RIZZATTI | H. R. ROMAN
|
G. MOHAMAD | E.Y. NAKANISHI
standards as shown in Figure 12. Bedding mortar used in the ex-
perimental tests followed the recommendation of BSI-5628-1 [10],
where the proportions of cement:lime:sand by volume were 1:1:6
(Mortar – I) and 1:0.5:4 (Mortar - II). Mortars recommended in the
British standards were used because they presented minimum
Figur��������r��i�g��i�i��������r��r�����
mechanical characteristics for each type of proportioning. The wa-
ter/cement relation was adjusted to achieve a fixed consistency
of 270 mm ± 10 mm when measured on a flow table. The bed-
ding mortar was prepared using a mixer with a vertical axis. For
each mortar, six cylindrical specimen 5 cm in diameter and 10 cm
in height were moulded for 28-day compression testing following
procedures in NBR 13279 [13]. The specimens were cured in a
laboratory environment for 28 days to reproduce the conditions of
prisms and walls.
Ta�le � � Ma�� unit� Portland Cement� Hydrated lime and �and u�ed in t�e mortar�
Material
Portland cement CP II F-32
Hydrated lime CH III
Natural Sand
3
Mass unit (kg/dm )
1,12
0,64
1,33
Figure �� � �elations�i� bet�een net
and gross area for different blocks
Figur��������ri�������������������r��u����r�����u�i�g����������������������r������