- Qualities of the honeycomb brick
- Physical characteristics
- Rolled masonry
- Advantages of masonry called "thin joint"
The honeycomb brick is able to dispense a wall of insulated insulation. The performance of the honeycomb brick is supported by the "thin-joint" installation system obtained by the "rolled masonry" technique.
The brick is as old as the world, and it's not just an expression. Taking soil with a consistent structure, giving it a shape, drying it in the sun and using it to build one's house was the basic idea of all the civilizations that settled down. Solid and massive, the terracotta brick has evolved into a brick with internal recesses, long called "hollow brick". Then, starting from this model, the researchers endeavored to improve it to reach the cellular brick.
Qualities of the honeycomb brick
Brick is a noble material, directly derived from nature. By its properties, it contributes largely to respect for the environment:
- It has a natural and durable insulation.
- It does not require any cooling energy in summer.
- It does not require the addition of synthetic insulation.
- It is simple to install and allows a fast, durable and solid construction.
- It is well adapted to seismic standards.
The so-called "hollow" brick was the first great progress. Its internal recesses, separated by partitions, were horizontal and only cut from those of the adjacent brick by the vertical joints, thick and roughly masonry. The primary goal was to lighten the material which, for the same weight, could fill a larger volume and thus allow a faster installation.
From this structure, laboratories have sought to obtain insulation performance as a priority. Starting from horizontal interior recesses, they multiplied the walls of separation, working forms, thicknesses and capillarity. But above all, it is by modifying the axis of the cells (now mostly vertical) and that of the direction of laying bricks that they have achieved great results. The first dimension given now corresponds to the face of the brick constituting the facing of the wall, even if this dimension is smaller than that constituting the thickness of the wall.
On the other hand, it is this dimension (thickness expressed in cm) that identifies the type of brick.
The brick R 50, format 250 x 500 x 249 mm, so officially has a length of 25 cm (siding) for a width of 50 cm (thickness of the wall) and a height of 24.9 cm (+ 1 mm thin seal to make the 50 cm).
Warning, this order is that of the new European standards!
By developing a new grouting process, "the thin joint", much faster, cleaner, more efficient and more economical than traditional joints, engineers have revolutionized the art of building.
In addition, for certain high-performance models, the addition of combustible grains such as sawdust, cardboard or recycled polystyrene (0.3%) further enhances the qualities of the material: during cooking, the beans are burnt and save money. energy and disappear completely by creating small air bubbles that improve the thermal insulation.
Thus, these new materials that are available in a complete range and several thicknesses, mounted with thin joints (1 mm) can bring only thermal and acoustic insulation performances capable of meeting the requirements of the RT 2005 and especially those envisaged by the RT 2012.
The technique of masonry called "rolled" or "thin joint" alone constitutes a small revolution in the building profession. To the point that most materials (concrete block, cellular concrete, etc.) have adapted to this new way of masonry.
The mortar is deposited in a thickness of 3 mm on the field of the cells by a kind of roller associated with a tank filled with mortar. The product is delivered in bag with bricks. Just add the indicated amount of water and spoil it with a propeller. The weight of the brick on the seal thus deposited is sufficient to reduce it by compression to 1 cm thick.
The success of this technique is conditioned:
- on the one hand, by the perfect flatness of the starting slab, made of a classic mortar and rigorously controlled (levels, metal plates and large construction rule);
- on the other hand, by the perfect flatness of the bricks whose tolerances are brought back (at the factory) to + or - 0.5 mm.
Once the first row is perfectly placed, the rest requires only attention and controls.
Advantages of masonry called "thin joint"
This type of masonry is a great source of savings:
The realization of a thin joint (1 mm) makes it possible to reduce the consumption of mortar of + 90% compared to the realization of a masonry in traditional joints.
Directly noticeable savings since the mortar delivered in bags with the bricks is also included in their price. So, more sand or cement trucks to intervene on the site and especially big reduction of the quantities of water necessary for mixing and cleaning.
Another important benefit stems from thin-walled masonry is the time saved by this type of masonry.
The precision of application of the seal Roller avoids mortar recoveries and recoveries.
The perfect calibration of bricks contributes to the simplicity of the installation thus to a speed of execution that could not authorize the conventional laying with thick joint.
- The economy of material avoids the renewal of the preparations and the return of wheelbarrows to the cement mixer of the building site.
- Indeed, it takes only 10 l of special mortar for thin-jointed masonry, 6 m2 of 20 cm bricks!
- Thus, only 170 kg of thin joint mortar is used for 20 tonnes of bricks instead of the usual 15 tonnes of thick joint mortar required for 26 tonnes of cement-based cement for the same job site, resulting in a saving in handling of nearly 15 tons.
- Thin-jointed masonry offers better strength than thick-jointed masonry. Lab tests put it at 50% higher.
- The interlocking vertical joints, together with the fineness of the horizontal joints of the rolled masonry, eliminate the thermal losses of the thick joints of the traditional masonry and contribute to the performance of the honeycombed bricks by appreciably improving the thermal coefficient "U" of the finished wall.
- Finally, this type of masonry makes it easy to keep a site clean, the quantities of aggregates and waste materials being very reduced.
(photos / visuals: © Wienerberger, except special mention)
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