Question 6. What's the difference between 'cement' and 'concrete'?

Often people use the two terms cement and concrete interchangeably, believing there is no difference between the two. However, cement is actually an ingredient of concrete. Concrete is essentially a blend of aggregates and paste. The aggregates consist of sand gravel and/or crushed stone; the paste is water and cement. Cement comprises 10 to 15 percent of the concrete mix. Over many years the cement and water harden bringing the aggregates closer together, making the concrete stronger, a process known as hydration. This process continues on for a very long time, therefore concrete keeps getting stronger over many years.