Development of a Zero-Cement Binder Using Slag, Fly Ash, and Rice Husk Ash with Chemical Activator

Table 7

Strength of mortar as influenced by types of activators.

Mortar	Activators; (5% by weight)	Compressive strength (MPa) at different ages
		3 days	7 days	14 days	28 days
Z-Cem 1	Ca(OH)2	—	2.61	6.59	18.10
	KOH	—	4.66	5.45	20.26
	NaOH	9.21	13.25	18.12	22.12
Z-Cem 2	Ca(OH)2	—	2.38	5.60	6.10
	KOH	—	3.32	6.20	26.35
	NaOH	10.24	14.65	20.12	28.32
Z-Cem 3	Ca(OH)2	—	5.22	10.42	13.35
	KOH	—	15.20	22.55	30.60
	NaOH	12.12	16.22	21.23	33.12
Z-Cem 4	Ca(OH)2	—	5.50	13.76	20.65
	KOH	—	9.53	19.10	27.46
	NaOH	13.87	20.12	34.15	42.24
Z-Cem 5	Ca(OH)2	—	6.30	12.70	14.90
	KOH	—	12.40	28.21	30.52
	NaOH	10.12	14.12	26.13	30.22
OPC	—	24.94	30.32	35.08	44.08