Table 4:
According to the ASTM C618 [
8
] chemical requirements of natural pozzolan.
Metakaolin
Pozzolan, Class N
Composition of Oxide
94.12
70
SiO
2
+Al
2
O
3
+Fe
2
O
3
, (min %)
0.45
4
SO
3
, (max %)
0.71
10
Loss on ignition, (max %)