What is reinforced concrete? Uses, benefits and advantages
Concrete blocks
Reinforced concrete combines traditional cement concrete with steel reinforcement to make use of both materials' strengths. The combination is made to utilise the compressive strength of concrete and the tensile strength of steel at the same time, to provide maximum strength.
This material requires careful engineering. Insufficient reinforcement can lead to structural weakness or failure. The concrete can be moulded into various shapes, enabling innovative architectural designs.
Advantages of reinforced concrete
Strength
Excellent performance in both tension and compression makes it a leading construction material.
Economical
Its constituents are widely available and inexpensive. Production costs remain low, and maintenance expenses are minimal due to the material's durability and longevity.
Versatility
The concrete can be placed into various shapes using shuttering or formwork, to form the desired shape, form, surface, texture and size.
Durability
Structures can last up to 100 years and resist rainfall and snow. Low permeability resists water soluble chemicals such as sulfates and chlorides, making it suitable for underwater applications.
Fire resistance
Concrete will not ignite and can withstand heat for 2 to 6 hours, outperforming steel and wood.
Ductility
Steel reinforcement provides ductility, allowing structures to show distress through cracking rather than sudden failure.
Seismic resistance
Properly designed structures resist earthquakes effectively.
Ease of construction
Requires less skilled labour than steel structures.
Waste recycling capability
Industrial byproducts such as fly ash and slag can substitute for cement or aggregate, reducing environmental impact while improving concrete quality.
Disadvantages of reinforced concrete
Heavier than steel, wood and glass structures
Requires extensive formwork and shuttering, which demands significant site space and labour
Needs time to achieve full strength and is not immediately usable after construction
Quality depends on proper mixing, casting and curing
Formwork costs are high compared with alternative techniques
Shrinkage can cause cracking and strength loss
Applications
Common uses include buildings, bridges, flyovers, water tanks, roads, floating structures, foundations, marine structures, pipes, precast works, chimneys, towers, retaining walls, bunkers and silos.
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