Abstrakt

The paper consists of two main parts: first presents study regarding the typically used pavement structures in tunnels and the second part: the first fire trials of the poroelastic SEPOR (Safe, Eco-friendly POroelastic Road Surface) mixture which was designed to be used among other uses in tunnels. In the first part of the paper different pavement materials, such as cement concrete, asphalt concrete, stone mastic asphalt and porous asphalt are analyzed from the point of view of fire resistance. The paper summarize the wide and comprehensive literature review (both technical reports, conference presentations and journal articles) and presents advantages and disadvantages of specific pavement types. In the paper also the perspective improvements and advantageous mechanisms are presented for asphalt pavements. The literature review helps the administration and technical staff to get to know the properties of each pavement and chose the best one for their application. The second part of the paper present the innovative poroelastic SEPOR pavement, which is designed to slow down the initiation of the fire. The mixture is designed using the mineral aggregate, rubber aggregate and highly SBS-polymer modified bitumen. The mixture is designed to contain at least of 15% of mass of rubber aggregate and with target of voids around 20%. Such composition allows to slow down the ignition of the fire and allow people to have more time for evacuation. The paper presents two fire trials which were conducted for the SEPOR pavement. First trial was designed to measure the temperature increase during fire on the level of the vehicle floor. The second trial was designed to measure both the temperature of the vehicle and the time of fire ignition and the development of fire. During second trial real vehicles were used in the test. The measurement were direct for the real fire conditions. The first trial showed that the SEPOR pavement shows lower trial of fire temperature development. The measured temperatures were lower and increase slower in comparison to the pavements typically used in tunnels, such as stone mastic asphalt (SMA) or cement concrete. Also the SEPOR pavement showed in some specimen the possibility to dampen the flames during the fire. The second trial showed that SEPOR pavement presents superior ability in comparison to classical asphalt pavements, such as SMA.

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