Steel and concrete are the two most used materials in the construction of buildings. Their use in foundations is crucial for the building’s stability. However, these two materials are often compared in building construction. This raises the question: Is steel stronger than concrete in building construction?
Interestingly, both steel and concrete have excellent strength. You’ll see people using both of them when building large buildings. However, steel is generally considered more durable and stronger than concrete. In this article, I will discuss these two building materials and help you choose the right one for your building’s construction.
Overview of Steel & Concrete
Before going into a strength comparison, let’s first understand the basics of these two materials.
Steel is a metal that contains iron as its primary element. On the other hand, concrete lacks metallic properties. It is made by mixing cement, small stones, water, and sand. This mixture is initially soft but becomes very solid during curing and drying. The primary use of concrete is in the construction industry, while steel is more versatile.
In the past, buildings were mainly made of concrete, with minimal use of steel. As a result, the foundations of those buildings were weak, leading to cracks.
The use of steel in modern buildings has given them stability and durability. Engineers use steel in foundation parts such as beams and columns. These steel components distribute the building’s load evenly.
This results in buildings being more stable and less likely to deteriorate even in extreme weather. Since steel is flexible, this material allows buildings to withstand earthquakes. Different types of steel differ mainly in terms of strength and corrosion resistance. Conversely, concrete is decent in terms of strength, but it cannot bend. When subjected to extreme stress, this material fractures rather than bends.
So, this makes concrete less safe to use, especially during earthquakes. Notably, steel and concrete offer distinct value propositions. As a result, people have different opinions on these building materials. Whether you should use steel or concrete depends on your individual preferences. Ideally, a combination of these materials is what most people should look for to achieve the best durability.
Is Steel Stronger Than Concrete in Building Construction?
Yes – steel is generally stronger than concrete. That’s the primary reason why steel is preferred when engineers construct large buildings. From foundation to overall structure, this metal offers excellent performance. Concrete is also a decent option, but it has some drawbacks, as it cannot resist pulling.
Some may not agree with me and consider concrete stronger. However, concrete only offers excellent compressive strength. This means it performs well under compressive forces. It struggles when exposed to tensile or flexural forces. A building can be subjected to various forces throughout its lifespan.
It would face extreme storms and earthquakes. The concrete may withstand storms, but it won’t withstand earthquakes. Eventually, the buildings will crack and can even collapse. That’s because concrete has no bending capabilities. When exposed to a pulling force, concrete without bending simply breaks.
That leads to the collapse of large buildings during earthquakes. On the flip side, steel has excellent resistance to pulling forces. It first bends before breaking, which makes steel a safer option. In the section below, I will compare these materials, steel and concrete, for building construction.
1- Compressive Strength
As I said earlier, concrete is a superior option if you want better compressive strength. This strength indicates how well a material resists compression. Imagine a material that’s being pressed by a heavy load or force. If the material is weak, it will crush; otherwise, it will hold. Both steel and concrete resist crushing and withstand the load.
Concrete behaves somewhat differently from steel, especially under compression. You’ll see concrete used at the base or foundation because of its higher compressive strength. Steel offers decent strength, but its higher cost makes it less suitable when only compressive strength is needed.
2- Tensile Strength
Steel wins the debate when it comes to tensile strength. This strength indicates the material’s ability to withstand pulling forces without breaking. When pulled, steel stretches a bit, but does not break. That’s why this material is used in the making of columns and beams of the buildings.
During earthquakes, these steel components are subjected to tensile forces. These components stretch slightly and withstand pulling forces without breaking. Conversely, concrete has very low tensile strength. When pulled, this material breaks instead of stretching. Because of this, concrete buildings are more likely to collapse in earthquakes than steel ones.
3- Flexural Strength
The material used in building must have flexural strength for better performance. This strength refers to the material’s load-bearing capacity before breaking. Material with high flexural strength can bend slightly under high loads. Steel has high flexural strength, which is suitable for large buildings.
The components, such as slabs, columns, and beams, can slightly bend. Concrete material is significantly compromised in this aspect. Why? That’s because concrete cannot bend when a load is applied to it. When the load exceeds its compressive strength, concrete fractures rather than bends. This can lead to the collapse of the buildings, especially in harsh conditions.
4- Ductility
Have you ever noticed prominent cracks on concrete buildings? That’s because of the low ductility of this material. Ductile refers to the ability of a material to bend instead of break when sudden stress is applied to it. Steel, on the other hand, has higher ductility, meaning it can bend and deform.
This makes steel an ideal choice for large buildings. Remember that flexural strength and ductility are two different, but both relate to a material’s ability to bend. Thanks to its superior ductility, steel helps prevent buildings from collapsing, no matter how old they get. Concrete buildings, on the other hand, become more prone to collapse as they age.
5- Building Durations or Lead Time
Lead time is an important parameter to consider when choosing building materials. Concrete is easy to make and does not take much time. All you need to do is mix cement, sand, stones, and water. This mixture will give you concrete ready for use in the buildings. Upon drying, this mixture firmly holds the building structure in place.
On the flip side, steel structures can take more time. The fabricators will take the measurements and then cut steel to make custom parts. These parts are then shipped to construction sites and assembled to create steel structures. This means more steps are involved, which makes steel buildings more time-consuming and complex.
6- Heat & Fire Resistance
Heat and fire resistance are important considerations when constructing buildings. If the material used is not fire-resistant, it can pose a serious threat to the building’s structural integrity. Steel is not an ideal option for fire resistance. Why? That’s because steel melts and loses strength when exposed to high heat.
Additionally, this material has high heat conductivity. This means that this steel transfers heat, which is not suitable for other building structures. On the other hand, concrete is fire-resistant and has very low heat conductivity. When exposed to heat, it maintains its strength and does not melt or degrade.
7- Corrosion Resistance & Longevity
Corrosion is a serious issue that can affect the quality and integrity of materials. Steel is prone to corrosion, especially when exposed to moisture or salty conditions. This corrosion damages this material over time. Contrarily, concrete does not corrode and remains in good condition for a long time.
Manufacturers apply an additional coating to enhance steel’s corrosion resistance. However, this coating isn’t a permanent solution, as it degrades over time. If you use steel, you’ll need to maintain it after a specific period by applying a thin coat of paint. Since concrete doesn’t corrode, it offers better longevity in construction projects.
8- Availability & Cost
Both steel and concrete are widely available in the market. What makes concrete stand out is its ease of production. You can make concrete by mixing cement, sand, water, and small stones. This mixture, when it dries, becomes hard and strong.
Producing steel is a bit more challenging. In fact, the components used in buildings require utmost precision. Dedicated manufacturers cut those pieces and then assemble them into steel structures. There is more labor cost and effort involved in making steel structures. Concrete is readily available and very cost-effective.
Concluding: Is Steel Stronger Than Concrete?
As mentioned above, steel is stronger than concrete. Steel buildings can withstand earthquakes and storms with ease. The material selection for any building is not all about the strength. There are many other factors to consider when choosing materials for building construction.
Concrete is a better choice if you need corrosion resistance and greater compressive strength. Additionally, this material works better when you’re short on time. Workers can easily mix concrete and start construction right away. Steel buildings can take longer to build and cost much more. However, their ability to resist earthquakes is far superior to that of concrete ones.