The BPE or Concrete Ready
This is an industrial product at a concrete plantIt is ready to use as the name suggests and a mixer truck with the book cost of the workshop where the work is taking place. He is ready to be used directly with the chute of the truck mixer or with a mat or a concrete pump.
Reinforced concrete
This is a assembling the composite mechanical properties of concrete and those of steel is an alloy of iron and carbon in a small proportion. To strengthen its tensile strength, it is necessary to add structural steel that is resistant to towing but also the pressure. This allows a better balance given the shortcomings of this material and prevents the opening of microcracks after traction.
It François Hennebique who invented reinforced concrete in 1866. It was the material used for the construction of the bridge Camille de Hogue Châtellerault 1899, is characterized by improved resistance to compression. However, this is not the case in front of the traction.
The prestressed concrete
It combines concrete and framing method called preload which was invented by E. Freyssinet in 1928The first is strong in compression but it is not the case vis-à-vis the traction, it cracks and breaksIt therefore only cover the frames but can not play roles in the strength.
This technique allows to reach the steel, causing the material to be compactedIt promotes the strength of it, extends the reach of carrier materials and stabilizes the forces of external loads.
High performance concrete or HPC
Its lifetime is long, it is resistant to frost and compression and it reduces the amount to be used. Resistance as high as 50 MPa and 35 MPa against 30 for the traditionalIt requires only a small amount of water
It is also known for its fluidity due to superplasticizers. This ensures easy use and a more adequate absorptionIt is not necessary to do so stirring to obtain smooth surface.
The shotcrete
It is similar to the type usually has the same constituents as the latter but its uniqueness lies in its shaping. It is operated at high speed with compressed air and the objective is to avoid casting. It is the force of the impact on the surface is compressed and this also helps fight against shortening.
This technique is advantageous because the forms are no longer required. It only needs a unique range of support and it can also be implemented on rounded surfaces and discontinuous. |
