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What are the advantages and disadvantages of emulsified asphalt compared with hot asphalt?
What are the advantages and disadvantages of emulsified asphalt compared with hot asphalt?
January 25th, 2022
emulsified asphalt,asphalt,hot asphalt
1、 Good road performance
When hot asphalt is used as bonding layer, because the original pavement is at normal temperature, the sprayed hot asphalt solidifies rapidly and is no longer popular, so it is difficult to ensure the uniformity of distribution; The asphalt content of emulsified asphalt can be adjusted arbitrarily according to the distribution amount and the specific situation of the distributor.
2、 Energy conservation
When hot asphalt is used for road construction, a large amount of energy is generally used to heat asphalt materials and mineral aggregate. In order to maintain the due temperature of asphalt at all times during the construction process, repeated heating and continuous heating are often required, which will not only increase energy consumption, but also consume a lot of human and material resources, but also cause the aging of asphalt materials.
Cloudy and rainy days and low-temperature seasons are unfavorable times for hot asphalt construction, as well as the season in which many diseases of asphalt pavement occur. The use of emulsified asphalt for pavement maintenance can immediately construct after the rain and quickly open the traffic, which can not only reduce the cost caused by shutdown and machine downtime, but also reduce the spread and expansion of diseases.
5、 Reduce environmental pollution and improve construction conditions
Due to the high heating temperature (160 ~ 180) and long heating time of hot asphalt, the harmful substances in asphalt diffuse into the environment, causing environmental pollution and great harm to the health of construction personnel. Moreover, due to the high temperature of hot asphalt, the probability of scalding of construction personnel will be increased.
Emulsified asphalt is cold mix construction, which does not need heating, which avoids the burn and scald accidents caused by burning asphalt and the fumigation of asphalt steam paving high-temperature mixture.
In addition to the above advantages, emulsified asphalt also has some weaknesses
(1) It is necessary to add asphalt emulsifier and emulsified asphalt production equipment, which increases the cost accordingly, but in the long run, this cost will be saved in a certain period of time;
(2) Because emulsified asphalt mixture contains water, its forming strength is slower than that of hot asphalt mixture;
(3) low content emulsion increased transportation cost, which also led to the development of emulsified asphalt products with high content.
It can be seen that emulsified asphalt also has a certain scope of application and methods, but it still has many advantages compared with hot asphalt. The overall social, economic and environmental benefits are much higher than hot asphalt.
When hot asphalt is used as bonding layer, because the original pavement is at normal temperature, the sprayed hot asphalt solidifies rapidly and is no longer popular, so it is difficult to ensure the uniformity of distribution; The asphalt content of emulsified asphalt can be adjusted arbitrarily according to the distribution amount and the specific situation of the distributor.
2、 Energy conservation
When hot asphalt is used for road construction, a large amount of energy is generally used to heat asphalt materials and mineral aggregate. In order to maintain the due temperature of asphalt at all times during the construction process, repeated heating and continuous heating are often required, which will not only increase energy consumption, but also consume a lot of human and material resources, but also cause the aging of asphalt materials.
During prime coat oil construction, if diluted asphalt is used, the content of kerosene and gasoline may reach 50%, but high permeability emulsified asphalt only contains 5% ~ 10% or does not contain kerosene or gasoline. Environmental friendly penetrant is used, so the use of emulsified asphalt has very important saving value.
During the long term construction application, it is found that there are few phenomena such as oil bag, wave and wave in the high temperature season. In addition, because emulsified asphalt is cold construction, the repeated heating of asphalt is reduced, the aging phenomenon of asphalt is reduced, and the stability and durability of pavement are enhanced.
4、 Extend the construction seasonCloudy and rainy days and low-temperature seasons are unfavorable times for hot asphalt construction, as well as the season in which many diseases of asphalt pavement occur. The use of emulsified asphalt for pavement maintenance can immediately construct after the rain and quickly open the traffic, which can not only reduce the cost caused by shutdown and machine downtime, but also reduce the spread and expansion of diseases.
5、 Reduce environmental pollution and improve construction conditions
Due to the high heating temperature (160 ~ 180) and long heating time of hot asphalt, the harmful substances in asphalt diffuse into the environment, causing environmental pollution and great harm to the health of construction personnel. Moreover, due to the high temperature of hot asphalt, the probability of scalding of construction personnel will be increased.
Emulsified asphalt is cold mix construction, which does not need heating, which avoids the burn and scald accidents caused by burning asphalt and the fumigation of asphalt steam paving high-temperature mixture.
In addition to the above advantages, emulsified asphalt also has some weaknesses
(1) It is necessary to add asphalt emulsifier and emulsified asphalt production equipment, which increases the cost accordingly, but in the long run, this cost will be saved in a certain period of time;
(2) Because emulsified asphalt mixture contains water, its forming strength is slower than that of hot asphalt mixture;
(3) low content emulsion increased transportation cost, which also led to the development of emulsified asphalt products with high content.
It can be seen that emulsified asphalt also has a certain scope of application and methods, but it still has many advantages compared with hot asphalt. The overall social, economic and environmental benefits are much higher than hot asphalt.
