Question

Iron or steel is used in reinforcement in concrete because:

• A. Concrete has high coefficient of expansion than iron or steel.
• B. Concrete has low coefficient of expansion than iron or steel.
• C. Both have nearly equal coefficient of expansions
• D. Iron or steel is a good conductor of heat.

Answer 1

The correct option is C Both have nearly equal coefficient of expansions

Steel has higher tensile strength and ductility which concrete lacks, also it is cheaper than glass fibres and Fibre-reinforced-polymer (FRP) rebars.Also steel has good shear strength which FRP and glass fibres lack.

One problem with steel reinforcement is concrete's alkalinity, which causes corrosion. Use of FRP rebars dramatically reduces problems relating to corrosion and can be used where steel would not be acceptable (eg: MRI machines have huge magnets hence steel structure for the machine is inacceptable).Iron or steel is used in reinforcement in concrete because

both have nearly equal coefficient of expansions