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Original scientific fruits, International advance level
DTC phase change energy storage and temperature adjustment road material

   Nowadays, "the Fifth Generation Road" has been initiated in the world,one of its core technologies is to harness solar energy, and let road become power provider for itself. It is not argued that this new technology will lead road construction enter a new era.

   DTC phase change material can fundamentally improve the performance of bituminous mixtures, this additionalmaterials just like "space suit", it can store energy by itself and transition temperature at different environmental temperatures, and due to distinguished with ordinary bituminous mixtures materials sensitivity for road temperatures, it can overcome many effects, for example, reducing the incidence rates of high-temperature wheel rut, low-temperature cracking and other damage to concrete. Finally, it can get the goal that prolong *4% fatigue life of bituminous mixtures, improve the adaptive capacity at different extreme temperature, and almost double the service life.

   DTC phase change materials can improve the adaptive capacity of bituminous mixtures fundamentally.

   Using phase-change energy storage and temperature adjustment mechanism, it can actively control the work temperature of bituminous pavement by releasing latent heat of phase change material when the temperature cooled, while store latent heat of phase change material at high temperature. Consequently, its abilities can extend the time that bituminous pavement work in the mild temperature and then improve the work environment.

   Enhance the adaptabilities for extremely low temperature, large temperature difference and so on. Through "peak load shaving" effects in extreme temperature.It means at the same environmental temperature level, when general temperature of bituminous pavement lower than 0 centigrade, while DTCs' usually can keep in 4 centigrade. In this situation, the road release latent heat of phase change material to remove ice resulted from snowing, freezing rain and frozen. Thus, the traveling safety can be ensured. Treasure our life by contain unblock of highroad.

   Release energy. According to the new perspective that controls the temperature of bituminous pavement actively, we use those features to initiatively control the extreme work temperature and the range. In the end, we can achieve the goals that improve road's adaptive capacity and dampen the temperature range. Especially, improving the capacity of road that solving troubles in extreme weather.
   The substance that can store heat energy and control temperature which is being called Phase Change Material, and also be known as latent heat energy storage materials. It is mainly through phase change to store energy and In order to fundamentally improve the performance of bituminous mixtures and avoid high-temperature wheel rut and low-temperature cracking, our technology can enhance the intelligence in control road's temperature to reach innovation in the field of road research, and then reduce the rates of risks.
 
Expert Meeting

Identification and project application meeting

 
Comprehensive characteristics
   DTC can be got from plants by using critical fluid extraction technology and frozen segregation. The second step is alkalinzation and chelate. Ultimately composite the novel compounds through chemical shield. Therefore, it can rise road's hot melt and ductility, there are also many other benefits, for example, stopping and lighten frosting and frozen phenomenon effectively. This a new invention, all advantages of it can reduce the occurrence rates of low-temperature cracking and also prolong the road's service life.
 
1. Double the service life of the road.
.   1) The performance of bituminous mixtures can gets fundamentally change. DTC through chemical looping grafting, firstly the long carbon chain in bituminous will shear and then shield with the hydroxide radical. All of those reactions can lead bituminous become more steady, its soften point will grow as the temperature rising and also it will become more flexible as the brittle point decline when temperature drop.

   Following is the comparative map between general bituminous pavement and DTC, when environmental temperature reaching extreme low. Chart 1is when environment temperature last in **5 centigrade, the temperature of DTC higher than general road **4 centigrade, especially from 5 to *0 centigrade. It means that DTC has function to control the temperature of bituminous pavement. The work principle is that making use of the feature of DTC.First it can release potential hot when temperature decline and store hot when temperature rising to control its own work temperature. Afterwards, it can limit the effects for working temperature as far as possible. It will become reality that extending the work time in working temperature by delaying the cooling time and improving the work environment.
  
 

     From those charts we can know that DTC can make use of solar energy to reduce the peak and valley value in extreme low temperature, when the temperature changed to **8 centigrade. Afterwards, bituminous less embrittlement in extreme low temperature and avoid generating cracks because stress,minimum the temperature difference and improve the adaptive capacity are the ultimate aims.
   

   2) Compare with general road, using DTC can decrease the 7% stress of bituminous pavement during the process of temperature reduction. It is benefit for bituminous pavement against the stress in low temperature during the process of fast cooling in the season of autumn change into winter.

   3) DTC can enhance accumulated dissipated energy of bituminous mixtures, extend its fatigue life in different temperature about *4%, improve the its resistibility for cold cracking.

   4) Due to bituminous mixtures has good effects on declining the stress and extend the fatigue life in different temperature,DTC can reach the goals that prevented disease related to temperature in some degree.

   5)After adding DTC , the thermal characteristics of bituminous mixtures are changed, it slowing the temperature decrease rate, and delayed the time that low temperature appears, and the stress reduce in different temperature no matter in fast cooling or continuous low temperature. At the same time, its flexural strength get improved, which lead low temperature and temperature fatigue cracks decrease.

   6)According the data of Marshall test and pavement performance test, our company discovers the precise parameter of how much DTC should be added, and then insures the function of temperature adjustment and making full use of its performance. All in all, the ending goals are enhancing road's ability to adapt any environment, solving the worldwide problems of temperature shrinkage crack and permanent deformation of rutting and so on.
 
2. Look out mobile security of black ice thoroughly.
   1)When temperature below 8 centigrades, the road can release plenty of potential hot, which is more than phase change potential heat ****0 times.

   2)When temperature changes drastically, especially in autumn and spring, black ice will become the most dangerous ingredients of accident. However, DTC in the road can use solar energy to store heat, those hot can reduce the difference between bituminous pavement and environment. Therefore, the hazards of black ice can be eliminated thoroughly.
 

   3)The application effects
   Following is when environment temperature drop to *5 centigrade dramatically, general road just last from 4 to 0 centigrade, while DTC can keep 7 to 3 centigrade. And this process can be extended 6 hours until 8 o'clock in the next day. All of those mechanisms can avoid frozen happen in depth.
 

 
3. Prevent the damage produced by freezing rain and frost zone.
   1)When environment temperature suddenly change to 0~**5 centigrade, ice is the most Destructive factor, which is formed by freezing rain and snow. What is more, the highway is totally paralyzed. DTC can prevent road from freezing, as a result of the temperature of bituminous pavement can keep in 3 to 5 centigrades higher than general road about 3 to 4 centigrades, when environment temperature change from *5 to **5 centigrade suddenly.


   2)Currently, DTC can melt 0.*6mm ice   
   3)Following is a comparative map of practical application.

 
4. Melting snow and reducing the harm from environmental greening.
   DTC road phase transition temperature materials can improve the service life of the pavement, reduce icing road accidents and traffic paralysis, improve the green environmental protection, avoid freight tools and bridge damage of traditional snow melting material and overcome the pollution of land, plant, water quality, environment.

The environmental temperature is **5℃,  temperature of DTC asphalt mixture road cooling effect compared with the general road

DTC phase change materials added to the road & road without DTC phase change materials

 
5. safety and reliablility.
   1) DTC 's safety and reliablility in the applying process.
   2) DTC is safe and reliable in when mix asphalt, construction, paves road and so on.
   3) Application safe and reliable.
     A. The result from Marshall detection.
     B. Low-temperature crack resistance.
     C. Stability.
     D. Freeze-thaw split test.
     E. The pavement performance of DTC.

 
6. Construction is simple and easy to do.
   Before mix bituminous mixture, the workers should put PCM on the side of feeding port. First step is dry mixing mineral aggregate and fiber, and then inject asphalt *0 seconds, the second step is adding PCM all at once, which doesn't to need extend the time to mix.