Effect of Chloride Ion on Free Nitrite Ion in Cement

Table 1

Chemical composition and physical characteristics of ordinary Portland cement.

Item	Cement
Composition (mass % as oxide)
Calcium oxide (Cano)	62.24
Silica (SiO2)	20.89
Alumina (Al2O3)	5.44
Iron Oxide (Fe2O3)	3.96
Magnesium oxide (MgO)	1.71
Sulfur trioxide (SO3)	2.65
Physical characteristics
Initial setting time (min)	160
final setting time (min)	280
Compressive strength (MPa)	25.6(3d) 48.5(28d)
Flexural strength (MPa)	5.12(3d) 7.05(28d)