Preparation of Magnesia Insulation Materials by Calcination of Walnut Shell Powder by Silica Sol Impregnation

Table 3

Samples’ proportioning scheme.

Composition (ω/%)		Ws10	Sws10	Sws15	Sws20
Porous magnesia aggregates	8-5 mm	10	10	10	10
	5-3 mm	10	10	10	10
	3-1 mm	20	20	20	20
	1-0 mm	15	15	15	15
Untreated walnut shell powder		10
Treated walnut shell powder			10	15	20
Calcium aluminate cement		6	6	6	6
Midrange magnesia powder		27	27	22	17
Silica fume		2	2	2	2
Sodium polyphosphate (additive)		0.02	0.02	0.02	0.02