Agriculture Reference
In-Depth Information
Table 1
Typical Components of Brickearth (Lamb and Shepherd, 1996, 68-70).
Components
%
Silica (SiO 2 )
79.59
Alumina (AI 2 O 3 )
9.88
Ferric oxide (Fe 2 O 3 )
4.78
Magnesia (MgO)
0.95
Lime (CaO)
0.96
Soda (Na 2 O)
0.82
Potash (K 2 O)
2.10
Titania (TiO 2 )
0.80
Phosphorus pentoxide (P 2 O 5 )
0.06
Nitric acid (HNO 3 )
0.06
Table 2
Aspley House Brick Sample - Chemical Analysis (Ceram Research, 1996).
Components
%
Silica (SiO 2 )
82.7
Alumina (AI 2 O 3 )
8.53
Ferric oxide (Fe 2 O 3 )
4.88
Magnesia (MgO)
0.58
Lime (CaO)
0.36
Soda (Na 2 O)
0.18
Potash (K 2 O)
1.41
Titania (TiO 2 )
0.67
Phosphorus pentoxide (P 2 O 5 )
0.09
Chromium sesquioxide (Cr 2 O 3 )
0.01
Manganic oxide (Mn 3 O 4 )
0.03
Zirconia (ZrO 2 )
0.07
Barium oxide (BaO)
0.03
The use of brickearth from within the curtilage of Aspley House would
have reduced brick costs by 50% or more. Searle (1936, 67) states '…an acre
1ft. [305 mm] deep, or about 1,600 cubic yards [1.223 m 3 ] of clay, will make
1,000,000 bricks'.
 
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