Assessment of Mechanical Properties and Damage of High Performance Concrete Subjected to Magnesium Sulfate Environment

Table 1

Chemical composition and physical properties of cement and mineral admixtures.

Materials	Cement	Fly ash	Silica fume
Chemical composition	Weight percentage (%)
CaO	64.70	8.38	0.77
SiO2	20.40	47.96	96.18
Al2O3	4.70	30.46	0.96
Fe2O3	3.38	5.91	0.85
MgO	0.87	2.60	0.74
SO3	1.88	1.32	0.50
K2O	0.83	1.61
Na2O		1.76
Loss on ignition	3.24
Physical properties
Specific gravity	3.15	2.31	2.22
Specific surface (m^2/kg)	362.20		2.74 × 10^4
28 d Compressive strength (MPa)	62.8