we are passing hotter than ever, At least that’s the feeling when we watch the news, listen to the radio, read the news and of course go out. And the worst part is that we expect the heat wave to get stronger later this week.
At the same time, the temperature in the rest of Europe is also worrying. This year we have seen the hottest June on record in Finland since 1844. The image of cold and rainy London is almost nostalgic. really, They expect to reach 42º,
The records are so heterogeneous that they are creating unpredictable conditions. United Kingdom This is not summer country. The realization is that its railway tracks are crumbling and the roads are melting. What happens that in Spain we don’t have these problems with high temperatures?
A road to every part of the world
Although at first glance it seems that they are all the same, the roads present small differences that differences between countries, The technical requirements they face are not the same in cold Scandinavian and hot Cordoba.
And this is a real problem now that London and Casares are not that far away, meteorologically. When a road is built, the volume of vehicles passing through it is taken into account, but the amount of rain or salt resistance in case of snow cover is also taken into account.
In Spain, the problems are different. In much of our country, there is a lot of meteorological obsession. high temperature that we reach in summer. As the UK experiences southern European temperatures, its roads are melting.
The asphalt we drive with our car is a mixture of stones and compacted sand, with a mixture of bituminous material printed on it that gives resistance to the top layer, but at the same time enough elasticity So that the asphalt on which they walk is not broken when vehicles pass by. This last layer used is a bitumen binder, which is not always used with the same consistency.
With the said binder, a hard layer is produced on which the traffic rolls and, at the same time, acts as a bond for the lower layers of stones and sand. The more cohesive this bitumen, the less elastic it is. as it states Francisco Jose Lucas OchoaRepsol’s director of technical and business development posted on his Twitter account the construction of Spanish roads under PG3 rules, which, in turn, are based on european rules,
yes, #MondayofRoadsThis is a good time to explain some things about what happens when it’s so hot (like in the last few weeks) and ASPHALT on our streets.
This is a recurring theme in the press, so I hope this mini serves you pic.twitter.com/VuM4dHuIOM
— Kurro Lucas (@curro_lucas) 23 August 2021
They specify the stability that bitumen binders must have when constructing roads. In warmer regions, a harder bitumen is used, which is classified as 35/50, while in colder regions 50/70 is designated bitumen, which is softer but reaches its softening point earlier. goes.
This means that Spanish asphalt Better resists high temperatures Compared to those used in the United Kingdom, but it is also less flexible and therefore more prone to breakage if the forces of the vehicle are not adequately distributed across the lower layers of sand and stones. Ochoa explains that “the internal friction of coarse aggregates” comes into play here.
Why do they use less consistent bitumen in the United Kingdom (and other colder countries in Europe)? Because being more flexible, it also supports fatigue better. In fact, the most consistent bitumen is also used on British roads, but they are intended for roads where heavy traffic operates on a recurring basis.
How do we fix it?
Beyond the fact that the construction of new highways considers the impacts resulting from the presence of climate change and extreme temperatures that are breaking down historical recordThere are other short-term solutions.
For example, to glue asphalt and lower its temperature. The idea of cold asphalt is not unique to the United States. in France, in the same year, they try Lower the temperature of the asphalt with water, Shortly before Tour de France cyclists pass through established sections, a tanker truck floods the road to reduce temperatures and the risk of the ground melting.
If the road surface starts to melt the bitumen into the tarmac then the Spready Mercury is all set and ready – sometimes we spread sand using grits to maintain the integrity of the surface.
— Richard Davis (@rgdavies) 15 July 2022
In the UK, for now, the strategy is paste asphalt material, In this case, you are choosing spread a small layer of sand So that, once the asphalt melts, it can attain consistency. Thus, the floor regains its strength and guarantees that the vehicle does not lose its grip.
On other occasions, graphene has been used, but also with the use of less dark colors for asphalt or to whiten a large surface. Indeed, the same strategy is being adopted on train tracks in the United Kingdom, as has already been done in Austria, which also suffers from high temperatures.
Another good example of how every asphalt is a world is cold asphalt. In the United States they have studied how to lower this surface temperature to avoid damage in extreme regions such as Phoenix. The Secret: Add Another Layer of Asphalt Mixed With Other Materials soap and water,