Portland Cement Type 1-42.5

Portland Cement Type 1, strength class 42.5, is produced in full compliance with the specifications set out in Iranian national standard INSO-389 and the European CE standard. This type of cement is used where high strength is required, such as in foundations, columns, bridges, tunnels and the like. The use of this type of cement in sulphate- and chloride-bearing environments is not recommended.

Some of the properties of this type of cement are given in the table below:

Chemical Properties

Composition	Value
SiO₂	20 to 23
Al₂O₃	4.8 to 5.5
Fe₂O₃	3.5 to 4.3
CaO	63.5 to 66
SO₃	≤ 3
MgO	≤ 3
Na₂O	≤ 1
K₂O	≤ 1
L.O.I	≤ 3
IR	≤ 2
Cl	≤ 0.05

Physical Properties

Physical property	Value
Autoclave expansion (%)	≤ 0.25
Blaine (m²/kg)	≤ 370
Initial setting time (minutes)	≥ 125
2-day compressive strength (MPa)	≥ 25
28-day compressive strength (MPa)	≥ 46