Different Grades of Concrete
There are different grades of concrete in the market. The selection should be done based on your requirements such as strength and cost. The grade selection is based on applications such as beams, slabs, columns and foundations. In order to beat out the drawbacks associated with the weak soil, the weight of the building should be assessed properly.
Low density concrete
The density of traditional concrete is of the order of 2200 to 2600. The self weight of light weight concrete is in between 300 and 1850 kg/m3. The dead load will be reduced drastically and the progress of building will be increased. The hauling and handling cost will be reduced. If you go for frame structure, the beam and column should carry the load of wall and floor very efficiently. The thermal conductivity of light weight concrete is very low.
High density concrete
The strength of high density concrete varies from 3360 kg/m3 to 3840 kg/m3. If iron is used as fine and coarse aggregate, the density will be up to 5820 kg/m3. Heavy natural aggregates are used in heavyweight concrete. These natural aggregates include barites and magnetite. If barites are used, the density will be around 3,500 kg/m3. It is possible to use manufactured aggregates as well such as iron or lead shot.
The density is influenced by the type of aggregate. The density of high density concrete is 45% greater than the normal concrete. It is possible to achieve very heavy strength by going for iron or lead shot and it will be in the range between 5,900 kg/m3 and 8,900 kg/m3. The typical applications include construction of radiation shields and ballasting of pipelines.
Strength is the secondary concern when you go for mass concrete. The design will be based on durability, thermal action and economy. The thermal behavior is the most distinguishing factor of mass concrete from other types of concrete. Sufficient measures should be taken while dealing with cracks that arise withthermal behavior. The structural integrity should be protected and seepage should be contained.