Reinforced concrete: meaning and measurement

Prepared by Eng. Ahmed Fathy, Projects Manager · Last reviewed: 8 November 2026

Definition

Reinforced concrete is concrete with steel bars cast inside it, so the concrete carries compression and the steel carries tension. It is the main structural material for villas and residential buildings in Saudi Arabia.

Why it matters on a project

Its quality depends on three things together: the mix, placing the bars correctly with the right cover, and curing after the pour. A weakness in any of them shortens the building's life.

Measurement and pricing

Concrete is measured in cubic metres per element, rebar in tonnes and formwork in square metres.

Worked example

A 30 × 60 cm column 3.20 m high: volume = 0.30 × 0.60 × 3.20 = 0.576 m³ of concrete.

Common mistake

Reducing concrete cover to make pouring easier, so the steel corrodes early, especially in footings and wet areas.

Frequently asked questions

What concrete cover is right for the rebar?

The designer sets it by element and exposure; it is larger in footings against soil than in internal slabs.

When can the formwork be removed?

It depends on the element, weather and specification; column sides come off sooner than soffit formwork under slabs and cantilevers.

Related terms

Reinforcement (rebar)Steel bars placed inside concrete per bar-bending schedules to strengthen structural elements.
Concrete grade (compressive strength)The characteristic compressive strength of concrete at 28 days, e.g. C30 or 300 kg/cm².
CuringKeeping concrete moist and at temperature after pouring so it reaches its design strength.
Slump testA simple site test measuring the consistency and workability of fresh concrete.
Footings (foundations)Structural elements that transfer the building loads to the soil.

Reinforced concrete