Items/ Indexes

National Standard

Internal controlled indexes

Cement MgO (%)

≤ 5.0

3.80

Cement SO 3 (%)

≤ 3.5

2.30

Cement loss on ignition (%)

≤ 5.0

2.01

Cement fineness (%)

≤ 10.0

1.00

Setting time (min)

≥ 45

190

Final setting time

≤ 600

245

Strength(MPa)

3-day compressive strength

≥ 22.0

23.30

3-day bending strength

≥ 4.0

5.1

28-day bending strength

≥ 6.5

7.2

28-day compressive strength

≥ 42.5

47.5