Effect of Nanosilica on the Fresh Properties of Cement-Based Grouting Material in the Portland-Sulphoaluminate Composite System

Table 1

Chemical composition of ordinary portland cement and sulphoaluminate cement.

Item	⁢Chemical composition (%)
	P·O42.5	R·SAC42.5
SiO2	15.80	4.23
Al2O3	5.47	11.60
Fe2O3	2.72	0.97
CaO	48.00	42.96
MgO	2.13	2.34
SO3	1.59	13.58

P·O42.5: ordinary portland cement 42.5.
R·SAC42.5: sulphoaluminate cement 42.5.