Optimization and Hydration Mechanism of Composite Cementing Material for Paste Filling in Coal Mines

Table 6

Setting time and compressive strengths of samples at different ages.

Test number	Setting time (min)		Compressive strength (MPa)
	Initial	Final	8 h	16 h	1 d	3 d	7 d	28 d
Portland cement	145	265	2.4	12.8	21.5	29.7	35.8	42.5
D01	22	29	2.9	16.4	25.4	32.7	37.4	44.8
D02	18	25	2.8	18.0	24.6	34.5	39.6	46.3
D03	87	135	2.6	14.8	23.8	30.2	37.6	43.6
D04	8	13	3.2	15.4	28.3	36.4	40.8	47.3
D05	12	20	3.8	17.8	26.4	40.1	43.7	48.9
D06	70	124	3.6	17.4	28.4	38.9	43.8	50.1
D07	187	304	0.6	3.2	5.4	23.2	20.7	18.2
D08	4	8	3.6	13.4	19.3	24.7	18.3	17.2
D09	42	64	4.2	18.2	29.3	39.7	44.5	52.7
D10	85	102	1.4	7.0	12.4	24.1	23.1	21.3
D11	10	13	5.4	10.3	13.2	24.3	20.2	18.9
D12	57	68	2.1	7.9	10.5	14.2	12.1	11.7
D13	12	15	2.7	9.2	14.1	21.3	20.7	19.2
D14	38	52	3.7	6.8	8.7	19.3	18.7	17.1
D15	17	22	3.1	7.2	7.9	18.4	17.2	16.9