Unlike conventional hollow core masonry units, CELCRETE is a solid block. The entire surface of the block is used in structural calculations, not just the face shell and web areas. Therefore a single CELCRETE block can safely support an axial load of 20 tonnes.
Moisture from both external and internal sources can cause damage to buildings therefore moisture protection is a primary consideration.
External moisture source is normally from rain. Internal moisture, usually in the form of humidity, can cause condensation on the surface of the walls as well as inside the wall itself.
Moist walls can allow mould and bacteria to grow, cause surface discolouration and damage to plaster and wall finishes and may generally create an unhealthy environment.
CELCRETE AAC has a structure of small air bubbles evenly distributed throughout the material.
The size of these pores is such that absorption of water into CELCRETE AAC by capillary action is minimal.
This structure enables the material to breathe. It is vapour permeable, enabling atmospheric equilibrium to be maintained, but is, unlike standard concrete, impervious to water.
All buildings must be protected from the influence of external water sources. A breathable plaster and paint system, that will not restrict the “breathing” characteristics of CELCRETE, is recommended.
Thermal protection in buildings directly influences the use of energy for heating and cooling, as well as the ability to control the room climate at comfortable levels.
Any heavy material has the ability to absorb, store and gradually release heat. This property is commonly referred to as thermal mass. One of the most important benefits of thermal mass in house construction is its ability to moderate temperature extremes.
Thermal protection for winter conditions is intended to minimise the heat loss from the building, thus allowing the building to be economically heated. Furthermore, the internal surfaces of the external elements, such as walls and ceilings, should not drop below a certain minimum temperature in order to avoid condensation. When the outdoor temperature is cold, heat from the sun (and also from heaters) can be stored in high mass elements of a building. This heat is gradually released into the home once the energy source is no longer available. In this way the mass is effectively acting as a heater long after the original source of heat has gone.
In contrast, the thermal protection for summer conditions is intended to minimise heat gain from the warm outside temperatures and sun rays, thus allowing the internal environment to be economically controlled in a comfortable state.
Thermal protection in summer is mainly determined by the capability of the exterior building elements to store and dissipate heat. This property is determined by the mass and thermal conductivity of the building material. The thermal mass and thermal conductivity establish the thermal inertia, which causes a damping and time lag of the temperature peaks. In other words the mass absorbs heat from the sun and stores it. As the heat is stored in the mass, the air in the room is not heated as much as in a lightweight building.
The heat is only released into the building when the room temperature drops below that of the mass.
The structure of CELCRETE AAC optimally combines the material properties necessary to provide excellent thermal energy efficiency for a building and additional thermal protection is not required except where the veneer block and veneer panel products are used. A 200mm CELCRETE block wall outperforms conventional wood frame and concrete masonry construction for thermal efficiency (equivalent R value). This exceptional thermal efficiency is achieved by a very low thermal conductivity (U value) along with the thermal mass effect. This is a distinct benefit of AAC construction over other conventional building systems.
The R value of a 200mm thick uncoated CELCRETE wall with 9.5mm of plasterboard directly fixed to it is 1.6 as compared with the minimum requirement of .60 for solid walls in Climate Zones 1 and 2.
Sound Absorption & Insulation
Noise control in buildings is of great significance for the health and well being of the occupants, especially in residential dwellings, since they must provide an environment that is restful and relaxing. The building envelope must also maintain privacy for the occupants. CELCRETE AAC provides a sound insulation value 7dB greater than other solid building materials of the same weight per surface area. It’s high surface mass coupled with the mechanical vibration energy damping within it’s porous structure produces a construction material with exceptional sound absorption properties.
In addition to using a wall material with superior sound insulation qualities, it is essential to construct a wall in a manner that closes off air leaks and paths by which noise can go around or through the assembly. CELCRETE’S simple construction methods help to eliminate imperfections which allow sound transmission through walls, thus providing a wall assembly which offers superior sound insulation characteristics for the occupants.
CELCRETE AAC is non-combustible so in the event of a fire can help to prevent the spread of fire to other rooms. During a fire no toxic gases or vapours are emitted from CELCRETE . Based on overseas testing CELCRETE AAC block construction provides a fire rating of 4 hours for a 150mm thick load bearing wall. Reinforced panels provide a fire rating of 4 hours for a 200mm thick panel. A 100mm thick wall panel without any additional finishing materials achieves a rating of 3 hours.
These ratings are in excess of those required for residential or normal commercial buildings.
CELCRETE is a genuine masonry construction material, not an imitation masonry product. As such it has a greater life expectancy than lighter imitation, coated products. Buildings constructed of AAC in Europe over 60 years ago are still in good condition.
CELCRETE has a low shrinkage characteristic in comparison to conventional concrete. This shrinkage also makes them compatible with the similar shrinkage movements of cement-based mortars and renders. This reduces the risks of the plaster coatings cracking.
It is not susceptible to decaying and cannot be affected by termites or similar pests.
Its strength gives it greater resistance to impact damage and it will withstand any impact likely to occur under normal conditions.
ELCRETE is an economical product to use in construction, particularly where a building has been designed in modules specifically to accommodate the dimensions of the product. When this is done, on-site cutting and wastage can be significantly reduced. This approach also adds to the speed and simplicity of construction. Likewise, does the fact that the number of components and construction steps are less with a CELCRETE building system than some other methods of construction, hence economies can be achieved that will have a favourable impact on the construction costs.
The extremely efficient thermal protection properties of CELCRETE should be of considerable help to building owners in reducing their energy consumption and costs.
While it may be possible to construct an imitation masonry building at a slightly lesser cost than with CELCRETE , the practical benefits of a solid masonry building, plus the durability and lower maintenance, must enhance the relative long term value of the investment in such a building.
CELCRETE AAC is an inert, natural and environmentally friendly construction material. Although it is made from minerals that are in abundant supply around the world, the manufacturing process makes very economic use of them and all trimming waste is recycled back into the production process.
There are no harmful pollutants generated by the production process, which is in itself very energy efficient.
Being inert the material is non-hazardous and does not emit any harmful gases or vapours.