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1. Prepared by : Kazhan Khalid Omer Supervised by : Dr . Danar Talabani Types of concrete

2. High Density Concrete This type of concrete is also called heavyweight concrete. In this concrete type, the density varies between 3000 - 4000 Kg/m3 . These types of concrete are prepared by using high density crushed rocks as coarse aggregates. Among such materials, Barytes is the most commonly used material, which has a specific gravity of 4.5 . It is mostly used in atomic power plants and other similar structures because it protects all types of radiation.

3. Cellular Concrete It is a light weight concrete produced by introducing large voids in the concrete or mortar. Its density varies from 3 kN /m3 to 8 kN /m3 whereas plain concrete density is 24 kN /m3. It is also known as aerated, foamed or gas concrete .

4. 1. It has low weight. 2. It has good fire resistance. 3. It has good thermal insulation property. 4. Thermal expansion is negligible. 5. Freezing and thawing problems are absent. 6. Sound absorption is good. 7. It has less tendency to spall. Properties of cellular concrete : It has the following properties :

5. Ferro-Cement The term ferro -cement implies the combination of ferrous product with cement. Generally this combination is in the form of steel wires meshes embedded in a portland cement mortar. Wire mesh is usually of 0.8 to 1.00 m diameter steel wires at 5 mm to 50 mm spacing and the cement mortar is of cement sand ratio of 1:2 or 1:3. 6 mm diameter bars are also used at large spacing, preferably in the corners. Sand may be replaced by baby jelly. The water cement ratio used is between 0.4 to 0.45.

6. Uses of Ferro- cement Partition walls Window frames, chejjas and drops Shelf of cupboards Door and window shutters Domestic water tanks Precast roof elements Pipes Silos Furniture’s Manhole covers Boats . It can be used for making

7. Air Entrained Concrete It is a specially prepared plain concrete in which air is entrained in the form of thousands of uniformly distributed particles. The Volume of air thus, entrained may range between 3-6 percent of the concrete. The air entrainment is achieved by adding a small quantity of foaming or gas- forming agents at the mixing st age.

8. Glass Concrete When the recycled glass is used as an aggregate in the concrete, this type of concrete is known as Glass Concrete. They provide better thermal insulation and also have a great appealing look as compared to other types.  

9. Rapid Hardening Concrete This type of concrete is mostly used in underwater construction and in repairing roads. Because its hardening time is significantly less, it can be hardened in just a few hours. They are also used in building construction, where the work should be done fast.

10. Asphalt Concrete Asphalt concrete is a combination of aggregates and asphalt. It is also known as Asphalt. They are vastly used in the highways, airports, as well as in the embankments. They can be hardened in just an hour. That is the reason for its vast usage inroa ds .

11. Lime Concrete In this type of concrete, lime is used as a binding material with the aggregates. Before the invention of cement, the most used concrete was lime concrete. In today’s age, Lime concrete is also used in floors, domes, and so on.

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