Manufacture Of Brick Tiles From Local Raw Materials, N & NE Iraq.

(JZS)Journal of Zankoy Sulaimani,dec, 2005, 8(1) Part A(31-45)
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Table 3. The particle size distribution for
the studied samples (%).
Table 4. The results of Atterberg limits and Riekeindex
for the studied samples
S.No. 20
ìm %
S.
No.
Plasticity
index
Rieke
Index
1 60 25 15 1 10.8 10
2 30 50 20 2 17.72 28.57
3 28 60 12 3 14.17 9.52
4 35 55 10 4 7.81 11.18
5 52 43 5 5 12 15
6 62 34 4 6 7.465 10.5
7 32 48 20 7 25.33 10
8 70 20 10 8 9.85 13.4
9 49 33 18 9 8.56 5.2
10 42 36 22 10 16.75 7.34
11 46 33 21 11 15.24 13.67
12 54 40 6 12 12.04 5.36
13 37 58 5 13 6.33 6.1
14 15 78 7 14 5 6
In general, a Rieke index less than 10 is
desirable for ceramic industries [19].
Hence the samples 3, 9, 10, 12, 13 and 14
may be suitable for this purpose.
The results of linear shrinkage, apparent
porosity, water absorption, bulk density
and compressive strength are shown in
tables 5, 6, 7, 8 and 9. Figures 4, 5, 6,7
and 8 are illustrate the results as diagrams.
The samples 1, 2, 3, 4, 6, 7, 10, 11 and 12
under went linear shrinkage at
temperatures 950 and 1050 °C (Fig.4).
This is directly related to water of
plastisity and particle size. It increases as
the water of plastisity increases, and the
paertricle size decrease[3, 5, 19]. The
linear shrinkage values (Table 3) for
samples 5 and 8 were not recorded
because sample 5 broke at temperature
1050 °C and sample 8 broke at
temperature 950 and 1050 °C due to high
content of calcium carbonate which is
began to decomposed at temperature 850
°C that increase the cracks and cause
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