Review+materials


 * Construction materials

Exist a lot of materials for biuld structures. One of the is the stone, a natural resource very ancient and strong, a material irregular hard to cut. Other material is the brick, this is regular,is made of clay that is a thermal insulator very common. Also exist material that can be combine with the stones and the bricks, this are the cast iron, the steel and the concrete; the first is a metal that can adopt any shape, the second, the steel, is a metal that become from the iron, is a material that is more cheaper than others for the cost and the time, the iron and steel are weak to the tension. Finally, he concrete is the material most used in the construction, is a mixture between cement, water, sand and stones, is very strong, fireproof and waterproof. **