1200 Kg/m3 Formula : Underfloor heating

Lightweight concrete properties

Lightweight-aggregate concrete has a substantially lower bulk density than that of concrete made with gravel or crushed stone. This lower bulk density results in a light concrete necessary for the making of slabs and other building elements. The characteristic of the product offers the possibility to produce concrete with a wide range of densities and strengths while providing undeniable thermal and sound insulation.

The use of wood aggregates instead of gravel in a concrete mix provides several advantages :

• Lightweight aggregate concrete offers considerable weight advantages over other form of concrete and can be used in many different applications. 

• Lightweight concrete can be an alternative to the heavy weighted concrete for prefabrication production, energy efficient buildings, reduce dead load and speed of construction. 

• Lightweight concrete masonry units are up to 40% lighter than traditional concrete masonry units and still meet strength and drying shrinkage requirements for normal weight concrete masonry units.

Designers, builders and owners must become aware of the energy-saving potential of lightweight concrete used as insulating fill for floors and roofs :

• Lightweight concrete is an effective material in enhancing sustainability as compared to other construction materials. 

• Of currently used construction material, wood is the only one that is renewable. 

• Used in floor slabs, insulating concrete made of wood particles minimizes heat loss into the ground, prevents moisture condensation on the floor surface during hot and humid weather, and increases year-round comfort. 

Agresta’s research and development department, with the help of partners and a test center, developed formulas optimized for construction, renovation and interior design. Those formulas are composed of our wood aggregates “AGRESLITH-C” and cement, and each is adapted to one type of slab.

Properties of the  1200 Kg/m³ formula

• In every room and on any support.
• For the coating of underfloor heating.
• Stocks 350Kg of CO2/m3, the screed will contain 80% of wood chips after it has dried.
• The slab must be at least 7cm thick.
• Better thermal diffusion.
• Homogeneous temperature.
• Stabilizes the temperature of the slab.

Characteristics of the 1200Kg/m3 formula

Agreslith-C properties 

• Size : 4 / 10 mm

• Lenght : 20 mm

• Dry density (12 % humidity) : 150 kg/m³

• Average density after delivery : 220 kg/m³

• Thermal conductivity: 0.07 W/m.k.

• Specific heat (10 % humidity): 0.446 Wh/kg.K

• Thermal diffusivity: 0.00057 m²/h

Warning

• Minimum thickness of 10 cm
• Do not pour concrete below 5°C
• Do not use a screed pump

General precautions before pouring

• Put a polyethylene film with sufficient covering
• Take precautions to avoid perforating the film.
• Install control joints, expansion and contraction joints,… especially in large areas and in narrowing surfaces (doors, hallways, level differences)
• Install level references

General precautions after pouring

• During the hardening, do not operate on the slab
• Protect the structure from solar radiations, airstreams and rain.
• 24 to 48 hours after the pouring, install contraction joints if they were not installed before.

Mixture

Respect the order of introduction of these elements in the concrete mixer :

                Water > Cement > Sand > Agres Fibres > Agreslith-C

• Do not use a screed pump. The mix can be carried on a conveyor or a wheelbarrow.
• Wait for the mix to be homogeneous and progressively add fibers and wood.
• Mix for 2-3 minutes until the aggregate is uniformly covered with cement.
• Spread the concrete. Set the lattice tiling to half height of the screed or use polypropylene fiber.
• Cover the slab with a polyethylene film for 5 days.

Quality approach

Agresta uses monitoring tools to measure the efficiency of its products. Every day several samples are selected and analyzed in order to ensure a homogeneous quality of the production. Each step of the production is managed by an experimented team.

Samples

In order to perform tests of implementations, Agresta can deliver samples of wood chips. If you are interested, please contact Agresta’s sales department or contact us via our contact form.

References

Bag

• 52.5 liters bags
• Weight : Approx. 11 Kg
• Dimensions : L = 400mm, l = 600 mm, h = 150 mm
• 12 layers of 5 bags (homogeneous pallets of 60 bags)
• 9 layers of 5 bags ( homogeneous pallets of 45 bags)
• Pallets are filmed and protected

Big-Bag

• Maxi-bag of 500 Liters
• Weight : approx. 95 Kg
• Opening at the bottom and top handle
• Reusable

Bulk

• 90m³ Truck

Shipping

• Products will be shipped 5 working days after your request.