Influence of Nanomodified Waterproofing Agent on the Performance of Rigid Waterproof Concrete in Underground Engineering

Table 1

GB175-2007 quality standard for ordinary Portland cement.

Insoluble matter (%)		≤0.75
Insoluble matter (%)		≤5.0
Sulfur trioxide (%)		≤3.5
Loss on ignition (%)		≤5.0
Chloride ion (%)		≤0.06
Fineness (%)		≤10.0
Setting time	Initial setting (h:min)	≥0:45
	Final coagulation (h:min)	≤10:00
Flexural strength	Three days (MPa)	≥3.5
	Twenty-eight days (MPa)	≥6.5
Compressive strength	Three days (MPa)	≥16
	Twenty-eight days (MPa)	≥42.5
Stability		Qualified