Table 4:
According to the ASTM C618 [
13
] chemical requirements of natural pozzolan.
Composition of Oxide
Pozzolan, Class N
Metakaolin
SiO
2
+Al
2
O
3
+Fe
2
O
3
, (min %)
70
94.12
SO
3
, (max %)
4
0.45
Loss on ignition, (max %)
10
0.71