Category: Structure & materials
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Concrete grade is the required compressive strength at 28 days, for example C30/37 means 30 MPa on the cylinder and 37 MPa on the 150 mm cube. Saudi sites mostly test cubes, so the specification must state which specimen the grade refers to. It is set for each element on the structural drawings.
Why it matters on a project
Ordering a lower grade saves little and puts the building at risk; ordering a higher grade without need raises cost and adds nothing.
Measurement and pricing
Stated on the order together with aggregate size, slump and cement type.
Common mistake
Adding water on site to ease pouring, which drops strength below the specified grade.
Frequently asked questions
What concrete grade is common in villas?
The structural drawings set it; C25 to C35 is common depending on element and exposure.
How do I check the delivered concrete is the right grade?
Through the delivery ticket, a slump test and cubes or cylinders tested at 7 and 28 days.
Related terms
- Slump testA simple site test measuring the consistency and workability of fresh concrete.
- CuringKeeping concrete moist and at temperature after pouring so it reaches its design strength.
- Reinforced concreteConcrete containing steel reinforcement to resist the tensile forces concrete alone cannot carry.
- Quality control planThe list of inspections, tests and hold points for each activity and who approves them.
Does your project need structural design and reinforcement drawings? Send the drawings or a short description and we reply within one working day.
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