Additional Cast ‘Thick Sheet’
The steel construction is regarded as a self-supporting structural component and calculated without consideration of the cross-section of the concrete and designed, for example, to resist fatigue. The concrete is used solely to add weight and for adjustments with respect to the eigenfrequency, as well as for damping vibrations. A bonding course must be provided to ensure the bond, depending on the loading and the quality of the surfaces.
Effective Sandwich Construction ‘Thin Sheet’
The steel construction is calculated as a hybrid construction with a thickness of 5 mm to 8 mm. Interaction between concrete and structural steel requires a secure and durable bond, based on a mechanical effect. This can, e.g., be achieved through toothed rails, rail blades or similar means. A cost-efficient composite action can be established via head stud dowels. In this way a complete or a flexible bond can be achieved.
|Maximum particle size||4.5 mm|
|Compr. strength 3 / 7 / 28d fcm,cube 40mm||70 / 80 / 90 MPa|
|Flexible tensile strength after 3 / 7 / 28 days fctm, prism 40mm||10 / 10 / 10 MPa|
|Static modulus of elasticity Ec||32,000 MPa|
|Dynamic modulus of elasticity E||40,000 MPa|
|Poisson’s ratio μ||0.20 [-]|
|Density of the hardened concrete ρc||2,300 kg/m³|
|Thermal expansion αT at 20°C||12.4 · 10-6 K-1|
|Thermal conductivity λ||2.7 W/mK|
|Specific thermal capacity cp||1.0 J/gK|
|Log. damping decrement Λ||0.035 (D=0.56 %)|
|Processing time||60 min.|
|Yield||1,000 kg durfill mixed with water results in 440 liter cast|
|Package size||paper bags per 40 kg ea.
tank truck per 25 tons ea.
|Minimum quantity||1 palette with 35 bags ea.
equivalent 1.4 tons
Cement-bound concrete is a durable material that has been time-tested for centuries. Less energy is consumed for its manufacture and less CO2 emitted than in the production of reaction resin concrete (mineral cast), steel or cast iron. No surface treatment as sandblasting is required. No solvents are required for casting, the fresh but not yet set material is cleaned with water. Not used, hardened material may be disposed of in landfill or in road construction.
You can download the material properties of durfill, together with instructions for preparation of the substrate, instructions for installation, bases of analyses, literature for effectivity, service providers, system partners, as well as the durfill safety data sheet under downloads. A video shows the vibration damping characteristics of durfill. Further you can watch the production, mixing and pumping processes from the silo as well as the flow behavior of durfill under videos.