Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Sulphate resisting cement is a Portland cement with low tricalcium aluminate that resists attack by sulphate salts in soil and groundwater. It is used in foundations and members against soil, especially in coastal and sabkha areas.
Why it matters on a project
Sulphates slowly break up ordinary concrete from inside. The soil report gives their concentration, and from it the designer specifies the cement and concrete type.
Measurement and pricing
Usually not priced separately but within the ready-mix price. Sulphate resisting concrete costs a little more than ordinary, as the building material price bulletin shows.
Common mistake
Using ordinary concrete in foundations to save cost when the soil report calls for sulphate resisting.
Frequently asked questions
Where is sulphate resisting cement used in Saudi Arabia?
In foundations and members against soil, especially in the Eastern Province, Jeddah, coastal areas and sabkha, and wherever the soil report calls for it.
Is the cement alone enough?
No, it needs a low water to cement ratio, enough concrete cover and good waterproofing with it.
Related terms
- Concrete grade (compressive strength)The characteristic compressive strength of concrete at 28 days, e.g. C30 or 300 kg/cm².
- Soil investigation reportThe borehole study on which the foundations are designed.
- Footings (foundations)Structural elements that transfer the building loads to the soil.
- Concrete coverThe concrete thickness between the surface and the nearest bar.
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