TYPES OF CONCRETE RARELY USED IN BUILDING CONSTRUCTION
1) Normal-strength concrete
2) Light-weight concrete
3) Air entrained concrete
4) High-Strength concrete
5) High performance concrete
6) Self-consolidated concrete
7) Shotcrete concrete
8) Previous concrete
This type of concrete is produced by mixing basic concrete ingredients. Strength of it varies between 10 MPa to 40 MPa. The initial setting-time is 30 to 90 minutes depending cement properties and weather condition.
The unit weight of this type of concrete is less than the concrete made of basic ingredients. Normally unit weight varies from 240 kg/m3 to 1850 kg/m3. The strength of light-weight is 7 MPa to 40 MPa
3)Air entrained concrete
Air entrained concrete is the fabulous invention in concrete technology. It is produced by mixing air entraining admixture with normal concrete. The strength of this concrete type is lower than normal concrete.
This type of concrete is produced by selecting high quality aggregate, lowering w/c ratio and mixing admixture to concrete. The strength of this, is about 6000 psi.
5)High performance concrete
This special type of concrete strength can be 10000 psi to 15000 psi. That mean, it is super high strength. And it’s also high durable.
Its name describe about it. This doesn’t need any vibration for compacting. It’s compacted by its own weight. That’s why it’s also called self-compacting concrete. It has the high workability which is measured 650-750 mm on a flow table. That’s the reason for its another name, flowing concrete.
This concrete is applied onto structure or into frame by shooting with a nozzle. This technology uses compressed air to shoot. In this concrete application, placing and compaction undergo at same time due to air force.
This concrete contains 15% to 20% voids of its volume when set. These voids allow water to pass through it.
Concrete can be various types depending on mixing process, application methods, mixing compositions, chaseatesistic, performance etc. But the types of concrete, I discussed in this article, isn’t based on any specific purpose. Those are the common types of concrete.