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High fuel consumption, waste tires? Running on this road, the natural fuel consumption is high!
2021-08-28 16:02:35 【New automobile Chronicle】
Everybody knows , The cement road is noisy and bumpy , I always feel that the car's sound insulation and shock absorption are useless on such roads .
However, with the development of urban roads “ White to black ” Reconstruction project , The driving noise on many cement roads has been significantly improved ！ Because cement is very hard , The hardness of cement is not much different from that of stone ; Asphalt is an elastic and flexible material , Therefore, the rolling noise of tires can be reduced .
In addition, due to Asphalt “ soft ” Physical properties of , In terms of absorbing vibration, it is naturally better than “ Hard as a rock ” The cement floor is much better , And cement pavement in order to increase friction , And open laterally “ Anti slip groove ”, So when the tires roll , The impact of asphalt pavement is softer , The impact of cement pavement is hard impact . Asphalt pavement is obviously superior to cement pavement in terms of comfort .
Asphalt roads are “ Flexible pavement ”
But the resistance is much greater than that of cement pavement
But cement pavement is a disadvantage , There is no advantage ？
Of course not. ！ The biggest advantage of cement road is that it can save oil ！ Just because cement pavement can save hundreds of millions of oil for the country every year ！—— Cement pavement can save oil ？ Maybe it's something you've never heard of ！ But this is an ironclad fact ！
Let's make a simple analogy ：
People walk on the flagstone road , The feel of the sole of the foot is solid and firm , It's very down-to-earth , It's easy and fast to walk . But if you walk in the sand , Feet slowly sink into the sand , You need to get your feet out of the sand at every step “ Pull it out ”, Then take the next step , The sand is always “ Hold you back ”. There will always be a kind of “ Sink in ” The feeling of .
In fact, the situation is similar for cement pavement and asphalt pavement ： Cement pavement is “ Rigid pavement ” And asphalt pavement is “ flexible / Semi rigid pavement ”. In the hot summer , The softening of asphalt is very obvious , Softened asphalt will produce viscosity （ There is a slight adhesion on the sole when walking on it , I believe that careful friends go out at noon in dog days , I've experienced it countless times ）
The first reason for asphalt pavement is its low hardness （ That's why it's called “ flexible / Semi rigid pavement ”）
The second is that it will produce viscosity at high temperature , So when the tire rolls on the asphalt pavement , Roll resistance is too large .
But as a “ Rigid pavement ” Cement road , At any temperature “ A slate ”, Therefore, the rolling resistance of tire on cement pavement is obviously less than that on asphalt pavement .
Cement road can be better than asphalt road
Reduce 15% Fuel consumption of
According to the research report made by domestic universities , At the same flatness level , On ordinary highways ,60km/h At driving speed , The fuel consumption of cement pavement is less than that of asphalt pavement 8%; It's on the freeway ,120km/h At driving speed , The fuel consumption of cement pavement can be saved than that of asphalt pavement 15%.
What does that mean? ？ Let's calculate a set of numbers ： Suppose a car runs under an asphalt pavement , constant speed 60km/h The fuel consumption is 6L/100KM, constant speed 120km/h The fuel consumption is 7L/100KM, Then, under the condition of cement pavement, it becomes 5.5L/100KM and 5.95L/100KM Level up , On average, it can save fuel 0.5L~1L.
The neutral sliding distance experiments on different roads are also in line with the survey results of domestic universities ： The same tire 、 The same car 、 Under the same pressure , On asphalt pavement 20~0Km/h If the sliding distance is 110 Mi's words , So when we get to the cement pavement , Your grades will rise to 160 Meters above . It shows that the cement surface is of great significance to reduce tire rolling resistance ！
Is silence and comfort more important than saving gas ？ The car calls for fuel economy every day , But on the other hand, choose asphalt pavement for quiet and comfortable . But forget that asphalt itself comes from oil , And the same weight of asphalt is more expensive than cement 3 times ！
However, the pursuit of higher fuel efficiency is now a recognized goal , So how to balance energy conservation and comfort ？ Maybe we can only change ourselves in this period .
Like changing our driving habits
For example, use navigation software “ Avoid congestion ”
such as …… Use more energy-efficient tires
Maybe I won't drive in the end
Tesla car owners scan the code to get a free car wash
author[New automobile Chronicle],Please bring the original link to reprint, thank you.
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