High-rise buildings are made of concrete, but they will burn up after a fire. Why? concrete waterproofing additive

Concrete is among the most heat-resistant and fireproof building products to day. It is primarily made of sand, accumulations, concrete and water mixed in a certain proportion and does not consist of combustible components. From one more viewpoint, concrete is likewise a kind of masonry, such as common red blocks and stones, which will certainly not burn.

Concrete is composed of a selection of aggregates, and they will certainly not be ruined by fire unless they are exposed to high temperatures of countless levels Celsius. Note that this is about destruction, not melting. Normally talking, in order to affect the concrete structure, the called for temperature should reach at the very least 1100 ℃. Such a temperature is additionally far higher than the temperature level of a general high-rise fire. In an extra severe high-temperature state, concrete will not shed, however it will certainly decay and end up being weak. The decay caused by exceptionally high temperatures is called "stripping" in academia.

Take a solid firewall as an example. If it is revealed to a high temperature of 1099 ℃ for up to 4 hours, the concrete will certainly not show any structural damages. If it is a general timber structure, this temperature and period will permit it to burn and break down entirely.

Security of concrete

As for the performance of concrete is worried, concrete itself will certainly not catch fire and can avoid the spread of fire to a particular degree. It is non-flammable by itself, so the flame can not enhance the fire by shedding concrete. Stiff foam board is very common in home decoration. When the concrete is put, the construction team normally lays a layer of stiff foam in between the concrete wall surfaces. Inflexible foam can play a certain role in insulation. In the design of modern high-rise buildings, several homes usually set up cords and a large number of electrical devices products in the wall surface for beautiful layout.

Furthermore, this layer of stiff foam can also play a role in insulation. In winter months, the wall will not lose warmth rapidly, triggering the house to cool down promptly. Certainly, from the perspective of material selection, the stiff foam itself is not combustible and will certainly thaw when exposed to heats. Nonetheless, it is not eliminated that this layer of material will not melt in extreme atmospheres.

The state of different accumulations during the heating process, but because some structures reduced edges in terms of products, it should be non-flammable rigid foam, and this layer of foam will enter contact with electrical cords.

Over time, it isn't very easy to ensure that the wire will certainly not short-circuit due to maturing and ignite the foam in the wall surface. Based upon the possible reasons for fire and the scenario of fire getting out of control discussed above, the majority of the moment, it is triggered by human neglect. For example, unextinguished cigarette butts or randomly piled combustible materials that automatically combust because of high temperature, etc

On top of that, the style of high-rise buildings themselves additionally aids the spread of fire to a specific extent. The upright passages in skyscrapers are longer, which makes it simpler for fires to travel through fire passages, lift shafts and other areas to create a "chimney effect." In the chimney result, interior air increases or falls along a space with an upright incline, therefore triggering air convection to be improved. The most common is the procedure of a boiler, where hot air increases with the smokeshaft and leaves at the top of the smokeshaft. As the warm air in the smokeshaft escapes, exterior air is ultimately pulled in to load the gap in the combustion-supporting products, making the fire much more fierce.

For example, in the Garley Building fire in Hong Kong in 1996, when the structure was changing lifts, employees built bamboo scaffolding in the lift shaft. However later on, when the workers were welding and reducing steel, the high-temperature metal pieces that fell in the elevator shaft ignited the wood debris and structure products in the elevator entrance hall on the 2nd floor. This created a large fire, and the fire was so intense as a result of the large amount of combustibles and sufficient burning conditions that the building eventually became a catastrophe.

Consequently, the cause of fire in high-rise buildings is not the building itself but human elements. This is why, up until today, there are still security administration companies that continue to emphasize the issue of fire security in skyscrapers.

Distributor

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