Influence of Nano-SiO₂ on the Consistency, Setting Time, Early-Age Strength, and Shrinkage of Composite Cement Pastes

Table 3

Setting time and early-age compressive strength of cement pastes.

Serial number	Setting time			⁢Compressive strength (MPa)
	Initial	Final	Time difference	1 d	3 d	7 d
0#	8 hr 15 min	9 hr 20 min	1 hr 5 min	12.3	27.1	34.0
A1	8 hr 10 min	9 hr 10 min	1 hr	13.0	28.4	36.7
A2	6 hr 50 min	8 hr 5 min	1 h 15 min	14.5	31.3	40.1
A3	6 hr 35 min	7 hr 55 min	1 h 20 min	15.2	35.4	45.0
B1	5 hr 50 min	7 hr 20 min	1 h 30 min	15.3	36.0	45.4
B2	5 hr 25 min	7 hr 15 min	1 hr 50 min	16.7	38.2	47.2
B3	4 hr 50 min	6 hr 45 min	1 hr 55 min	16.0	39.4	47.5
C1	9 hr 10 min	10 hr 20 min	1 hr 10 min	6.7	14.5	28.4
C2	7 hr 40 min	9 hr	1 hr 20 min	10.8	28.7	38.6
C3	6 hr 15 min	7 hr 45 min	1 hr 30 min	14.0	32.5	41.7