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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 5
E. RIZZATTI | H. R. ROMAN
|
G. MOHAMAD | E.Y. NAKANISHI
Figure �� � Fai�ure mode of grouted and ungrouted prims (MENDES [8])
4.1 Clay for laboratory production of ceramic units
One of the first challenges of this work was to study the ideal clay
composition for block fabrication. The clay mixture should have
plasticity when mixed in water, so it can be shaped, contain suf-
ficient strength for keeping that shape and be able to fuse particles
at high temperature. The plasticity of the clay and the influence of
the drying and burning protocols depended on the particle size and
the minerals present in the clay. To produce units on a small scale,
clays were composed of colloidal particles with diameter smaller
than 0.005 mm. The final product, (i.e., the clay blocks) should
have physical properties such as aspect, dimension, squareness
and flatness that meet the according to the standardized recom-
mendations presented in Table 02 of NBR 15270-2 [9].
LINDNER [12] helped to develop a clay mixture for these stud-
ies. Two types of clay were used for fabrication of the units. The
clays were subjected to blending, grinding and homogenization.
Ta�ela � � Dimensional tolerances related to the average of effective dimensions
DIMENSION
Dimensional tolerances
related to the individual
measurements (mm)
Dimensional tolerances
related to the average
(mm)
Thickness (T)
± 5
± 3
Heigth (H)
± 5
± 3
Length (L)
± 5
± 3
Deviation from square (D)
3
Frog on bed faces (F)
3