Main PROPERTIES OF POLYSTYRENE CONCRETE
MAIN PROPERTIES OF POLYSTYRENE CONCRETE
Using polystyrene concrete wall blocks manufactured according to the customer's preferred dimensions, the following main properties are noted:
• Low flammability;
• High moisture resistance and frost resistance;
• Low thermal conductivity;
• High sound insulation;
• Practically not subject to rotting;
• Polystyrene concrete can be sawed, drilled, milled.
In terms of its characteristics and consumer properties, this material is closest to wood, but has greater durability, where over time its strength increases even more.
30 cm of polystyrene concrete wall is equivalent to 180 cm of brickwork thickness, the thermal conductivity coefficient in dry condition at a temperature of (25±5)°С is from 0.055 to 0.145 W/(m*K). For example, for the polystyrene concrete grade by average density D450 — 0.115. As a result, for the end user — a reduction in energy costs by 5 times.
Polystyrene concrete blocks "BREATHE" like wood, which is a natural regulation of humidity. Calculated coefficients under operating conditions (m2 h Pa) / mg at density grade D450 - 0.080.
Polystyrene concrete only gains strength over time, its service life is more than 100 years.
The temperature for using polystyrene concrete for the construction of buildings and structures is from -60℃ to +70℃, if water with a temperature of at least +8 ℃ is used.
The cost of 1 m² of a finished wall made of NORTEC polystyrene concrete blocks is cheaper than 1 m² of a brick wall with two-brick masonry by more than 60%, taking into account the requirements of level 3 thermal protection.
The rooms where the walls are made of polystyrene concrete heat up quickly and cool down slowly. Just as the cooled rooms heat up slowly.
The most important, defining characteristic of polystyrene concrete is its frost resistance, especially for edges - where the temperature can be extremely high and extremely low, especially with sharp jumps. Polystyrene concrete, depending on the grade of average density, can withstand the process of freezing and thawing up to 150-200 cycles.
The flammability class of polystyrene concrete is А1. Depending on the grade of medium density, it may correspond to the class - NF1 (non-flammable). Polystyrene concrete does not ignite and does not burn, in case of fire, the surface granules evaporate, and there is no smoldering or flame. It is important to note that when testing using a block thickness of 19 cm and a flame temperature of over 500 ° C during combustion for 2 hours. The thickness of the evaporated granules was 2 cm.
Polystyrene concrete blocks measuring 200x300x500 mm and having a density of D500 weigh no more than 17 kg. One square meter of such blocks creates a load on the ground of only up to 115 kg. Which is 5 times lighter than a brick wall 1.5 bricks thick.
Polystyrene concrete in general is used in the construction of self-supporting and non-supporting structures, in the case of using reinforcement in the construction of load-bearing walls. It can withstand a distributed load of up to 35 tons per linear meter with a wall thickness of 30 cm.
Polystyrene concrete is the only material from cellular concrete that allows "working in bending". The bending strength of concrete is 10% of the compressive strength, for polystyrene concrete this figure is 60%.
30 cm walls made of polystyrene concrete blocks dampen more than 70 dB of sound (i.e. the noise of a passing train), providing excellent sound insulation.
Polystyrene concrete contains cement, water, saponified wood resin and high-quality, environmentally friendly expanded polystyrene foam used in the food industry. It may also contain special additives to increase strength and plasticity. A system for recycling waste foam containers and packaging and secondary production has also been developed recently to prevent environmental pollution.
Polystyrene concrete absorbs only 6% of moisture, which is 4 times less than brick and wood. The possibility of fungus appearing is excluded. Polystyrene concrete does not sink in water for several months. The water permeability of polystyrene concrete is extremely low, due to which there is no need for waterproofing. The possibility of a dew point appearing inside a polystyrene concrete block is excluded.
Disadvantages of polystyrene concrete - foam plastic itself differs in density from concrete, due to the fact that the cement matrix contains expanded polystyrene granules and air pores. For this reason, polystyrene concrete has shrinkage deformation. Depending on the density and formulation, shrinkage deformation can range from 1 mm to 4 mm per 1 m. To achieve strength, reinforcement is required, and for plastering the surface of a polystyrene concrete wall with a plaster layer thickness of more than 1 cm, it is necessary to use plaster reinforcement. When constructing multi-story buildings, polystyrene concrete blocks are used only as a filler for openings with reinforcement.
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