To make concrete a mixture of portland cement (10-15%) and water (15-20%) make a paste. This paste is then mixed with aggregates (65-75%) such as sand and gravel, or crushed stone. As the cement and water mix, they harden and bind the aggregates into an impenetrable rock-like mass.
What Is Concrete Made Out Of?
Concrete is a construction material composed of cement, aggregate (generally a coarse aggregate made from crushed rocks such as limestone, or granite, plus a fine aggregate such as sand), water, and chemical admixtures.
Concrete is the most widely used construction material in the world. It has a wide variety of applications, from large–scale structures such as dams and bridges, to small–scale projects such as driveways and patios.
The main ingredient in concrete is cement. Cement is a powder made from a combination of calcined lime and clay. The exact proportions of these ingredients vary depending on the type of cement being manufactured.
Once the cement is mixed with water, it begins to chemically react and harden. This process is known as hydration. The water–cement ratio is critical to the strength and durability of concrete.
In order for concrete to set and harden, it must be mixed with an aggregate. The most common aggregates used in concrete are sand and gravel.
However, other materials such as glass beads, crushed stone, or slag can also be used. The aggregate is mixed with the cement and water, and then placed into forms. The forms can be made