Effect of Wetting and Drying Cycle on the Behavior of Teff Straw Ash-Stabilized Expansive Soil

Table 5

Chemical requirement for pozzolana [1].

Chemicals	Pozzolans class
	N	F	C
(SiO2) + (Al2O3) + (F2O3) (min. in percent)	70	70	50
SO3 (max. in percent)	4	5	5
Moisture content (max. in percent)	3	3	3
Loss of ignition (max. in percent)	10	12	6