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'.