Effect of Different Activators on Rheological and Strength Properties of Fly Ash-Based Filling Cementitious Materials

Table 7

Analysis results of orthogonal test for compressive strength of slurry.

Test No.		A	B	C	D	Compressive strength (MPa)
		Lime dosage	Gypsum dosage	NaOH dosage	Na2SO4 dosage	3 d	7 d	28 d
FH-1		1 (8)	1 (4)	1 (1)	1 (2)	0.73	3.43	15.87
FH-2		1	2 (5)	2 (2)	2 (3)	0.75	5.17	16.93
FH-3		1	3 (6)	3 (3)	3 (4)	1.32	5.77	17.53
FH-4		2 (12)	1	2	3	1	6.53	13.4
FH-5		2	2	3	1	1.51	7.87	12.67
FH-6		2	3	1	2	0.78	2.87	13.6
FH-7		3 (16)	1	3	2	1.43	6	10.8
FH-8		3	2	1	3	1.05	3.33	14.33
FH-9		3	3	2	1	0.81	5.4	13.67
Comprehensive strength at 3 d	K1	2.8	3.16	2.56	3.05
	K2	3.29	3.31	2.56	2.96
	K3	3.29	2.91	4.26	3.37
	K1 = K1/3	0.933	1.053	0.853	1.017		C > A > D > B
	K2 = K2/3	1.097	1.103	0.853	0.987
	K3 = K3/3	1.097	0.97	1.42	1.123
	Range	0.164	0.133	0.567	0.136
Optimal scheme		A2 or A3	B2	C3	D3		A2B2C3D3 or A3B2C3D3
Compressive strength at 28 d	K1	50.33	40.07	43.8	42.2		A > B > D > C
	K2	39.67	43.93	44	41.33
	K3	38.8	44.8	41	45.27
	K1 = K1/3	16.78	13.36	14.6	14.07
	K2 = K2/3	13.22	14.64	14.67	13.78
	K3 = K3/3	12.93	14.93	13.67	15.09
	Range	3.84	1.58	1	1.31
Optimal scheme		A1	B3	C2	D3		A1B3C2D3