Structural Material: Concrete

What’s the difference between cement and concrete? And why it matters to your project.

 

Do you get annoyed when you hear people say, “My head literally exploded”?

Then, you’ll relate to this post.

No one is pouring “cement” for a project today. Why? Because “cement” is NOT “concrete.” (We don’t care what Merriam-Webster says!)

 

Cement is an ingredient. Concrete is the finished material.

 

Cement (specifically portland cement) is a fine gray powder made from limestone, clay, cement rock and other materials that have been heated and ground down. On its own, it doesn’t do much. But mix it with water, sand and rock, and you get concrete—one of the strongest and most widely used structural materials in the world!

How’s that for a big difference?

Cement vs. concrete. Learning the difference is a piece of cake.

 

One of our engineers literally fell off her chair when she found out her son just learned about “cement” that day in school.

“No, dear, they were NOT pouring cement. They were pouring concrete!”

The analogy she gave her son can help us all remember the difference: “Think of it like baking a cake. The cement is the flour, and the concrete is the cake. The flour is just one component that makes it work.”

 

As structural engineers, we are the bakers. And just like baking a cake, the mixture matters.

Why the difference between cement and concrete matters to your project.

 

For structural engineers, architects, contractors, owners and developers working on commercial projects, the distinction shows up in real ways. It helps if we’re all speaking the same language when talking about concrete specifications, mix designs or pours.

Concrete has a mix design. Cement is just one variable in it. When MP-Squared structural engineers specify concrete for slabs, columns, piers or walls, we specify a precise mix: compressive strength (measured in PSI), water-to-cement ratio, aggregate size, admixtures and more.

The cement content is one dial among many. Changing it affects the concrete’s behavior, including its workability, its cure time, its strength gain and its durability. Concrete air-content and admixtures can affect the concrete performance as much as the cement type used.

 

Cement vs. concrete—a quick-reference guide

	Cement	Concrete
What it is	A fine powder, a binding agent	A composite structural material
Main ingredients	Limestone, clay, minerals	Cement + water + sand + aggregate
Structural use	Not structural on its own	Slabs, walls, columns, piers…
Ordered as	Bags or bulk powder	Ready-mix by the cubic yard
Specified by your structural engineer	As part of a mix design	As a finished material with strength requirements

 

The bottom line

 

Concrete is what gets poured, placed and cured on your project. Cement is what helps it bind together. As your structural engineer, we think about concrete every day—in terms of its strength, its behavior under load and its long-term durability.

If you’re planning a new building or concrete-restoration project and need a structural engineer who’ll work closely with your team to achieve success, we’d be happy to connect. (We promise to be low-key about the whole cement/concrete thing.😊)

MP-Squared Structural Engineers is a client-focused structural engineering firm based in Madison, Wisconsin, celebrating 20+ years in business. We provide efficient, accurate and thoughtful designs of new industrial, commercial and institutional buildings as well as building strengthening, retrofits, evaluations and the design of equipment support structures. Meet our team.