In the rainy and snowy weather, the slippery snow on the road area poses a great hidden danger to the traffic safety; in the high temperature season in summer, the hardened road absorbs a lot of light and heat, and the pedestrians walk on the roasting “geothermal blanketâ€; the traditional construction process leads to the road surface. The initial flatness is low, and the adhesion between the asphalt surface layers cannot form an interlock, which causes the pavement to be easily broken and the service life is shortened. Sochi, a teacher at the School of Civil and Transportation Studies at Beijing Jianzhu University, integrated the above issues and led the research team to develop multi-functional road materials from the perspective of humanistic care.
"Snow Snow" is a good helper in removing snow.
The traditional asphalt road area is snow-treated, and the working method of centralized cleaning of closed roads is usually adopted. Not only affects the normal driving of the vehicle, but also easily blocks the road. At present, most of the domestic passive methods such as mechanical deicing and snow melting agents are used. Foreign technicians have long studied the road self-melting method and turned passive into active. Suozhi led the team to combine the actual situation in the country and finally invented the “Snow-Snow†pavement additive. By adding this self-melting snow-blocking material to the traditional asphalt material, the freezing point of the road surface was reduced, thereby suppressing road surface icing and automatic melting road. The effect of snow. The advantage of “Snow Snow†pavement additive is that according to the difference of low temperature environment between regions, the adjustment of the proportion of road composite materials can be achieved to achieve free adjustment of the freezing point of the road surface. The maximum applicable temperature can reach minus 30 ° C, and the price is only for foreign technology. half.
The “Flying Snow†deicing additive has been tested in the Chengde section of Zhangcheng Expressway and has undergone a winter test. The effect of snowmelt deicing on the road is obvious. Suo Zhi said that “Snow-Snow†greatly improved the function of the road itself to melt snow and ice, reduced the risk factor of driving, and greatly reduced the pressure of traditional snow-clearing work. In order to improve the road self-defrosting ability team, the rubber material is added to the "melting snow", and the ice and snow are peeled off by enhancing the elasticity of the road surface to cause deformation under the wheel extrusion.
"cool and cool" road temperature changer
The demand for roads in densely populated cities such as Beishangguang is also rising. The density of roads in central urban areas is large. The ability of urban hardened roads to absorb heat is far from that of green spaces. In addition, black roads make it difficult to effectively dissipate heat.
At present, foreign countries use micro-encapsulation and other complex manufacturing processes to make the road surface temperature control technology level 7-8 °C, but the temperature control material price is as high as 150,000 yuan per ton, and the temperature control pavement cost about square meters. 2 thousand yuan, about 4 times the asphalt road.
In view of this situation, the Sochi team carried out all-round improvement on the basis of the early research results, and proposed that the temperature control of the road should be “from the inside and the insideâ€, and the treatment of the heat and heat should further cure the problem. In response to the problem of heat absorption on the road surface, the research team used petroleum resin to make transparent matrix cementing materials. By matching mineral toner, the color of the road surface can be changed from black to any color, which greatly reduces the accumulation of heat on the road surface. In terms of road heat dissipation, water with low cost and good heat absorption effect is selected as the phase change temperature control material, and the active adsorption water retention modifier is independently developed and utilized, and the heat generated by the road surface is absorbed by the slow heating property. In the end, the team developed a “cool and cool†ecological temperature control compound technology to achieve a road surface cooling temperature of 13.4 ° C, which can effectively help the air temperature to drop by 4.5 ° C, and the price of this pavement material only needs about 20,000 yuan per ton. Suozhi introduced, "In the process of development of road surface temperature, it can also be combined with the construction of 'Sponge City'. By changing the pavement level, increasing the proportion of coarse aggregates to increase the porosity, while realizing the convection heat dissipation of the road surface. To better integrate surface runoff and purify infiltration to supplement urban groundwater resources, which will further alleviate urban flooding and subsidence.
"self-healing music" road band-aid
The temperature of the initial pressure of asphalt pavement is generally maintained between 110 and 140 °C, and the temperature of the re-pressing section must also be maintained at 120-130 °C. More than 6 times of rolling can ensure the stable formation of asphalt mixture. The construction and maintenance of municipal traffic roads are often carried out in the summer. The purpose is to use the high temperature environment to make the asphalt concrete easy to be compacted after paving, so as to avoid the road surface water influencing the road quality due to the low temperature hardening. This extremely high road surface temperature combined with the heat generated by the operation of mechanical equipment makes the construction environment very difficult.
In addition, road maintenance is not only extremely labor intensive, but also difficult to detect in the initial stage of road cracks. The prior art equipment can achieve a maximum of 2 mm crack detection. Once the crack cannot be repaired in time, the rainwater intrusion will greatly reduce the road bearing capacity. Partial repair of asphalt pavement requires the use of asphalt mixing plants, pavers, road rollers and other machinery. The local repair and maintenance costs are roughly 4-5 times higher than the new construction costs. This is also a major incentive for road materials to be “changed and changedâ€.
Based on the concept of bionics, Suozhi draws inspiration from the self-healing of human wounds. In the course of research, he puts forward the idea of ​​self-healing of road fissures and develops “platelets†in road materials, namely “self-healing musicâ€.
"Self-healing music" is a compounding material composed of resin and expanded cement. When a crack occurs on the road, the resin absorbs the volume of the infiltrated rainwater to expand, quickly sealing the crack, and temporarily healing the "wound" of the road surface. Subsequently, the expanded cement generates a new gel material through the chemical reaction of water to form the strength of the pavement material and functions as a tissue repair. Adding “self-healing†bionic repairing agent to the road material is like implanting the immune system into the road. When the rain comes, the self-healing agent in the road will absorb and swell, block the cracks, repair the cracks, and restore the road. According to statistics from relevant departments, if “self-healing music†is applied to the main road in Beijing, the cost of road crack repair will be saved by about 1.19 billion yuan, and the average construction cost per cover will be about 2.37 billion yuan, and it will be reduced every year. Carbon emissions are 1633.5 tons.
"Anti-Shu Bao" automatic air purifier
In addition to “melting snowâ€, “cooling down†and “saving moneyâ€, Sochi led the team to reduce the visibility of “smog†and become a hidden danger on the road. Whether it can be seen in health and roads Thinking about finding answers in irrelevant things. Xie Congcong, team leader, said: "The reason for the smog is that the content of various suspended particulates in the atmosphere exceeds the standard, and the road is characterized by a large area. If a pavement material that absorbs smog can be developed, it can effectively absorb the smog, and It can improve road visibility and achieve the effect of killing two birds with one stone.†From this point of view, the research team expands on the road that can absorb “haze†and obtains the research results of “anti-mite roadâ€. The principle is that the pavement structure uses dense gradation, and the gap between the particles is small, which can effectively prevent evaporation of water, forming a water film with a thickness of about 0.61 mm on the road surface, and absorbing the dust in the air through the water film. Under ideal conditions, it can absorb up to 51% of dust in the air. After repeated simulation experiments, and specially developed a dust suppression analyzer, it can simulate the dust storm environment in Beijing, and is used to test the amount of dust that can be absorbed by the “anti-mite road†at one time. It has been determined that the “anti-smashing road†material can absorb 6 dust storms and 9 dusts, turning the road into the respiratory system of the surface, effectively absorbing dust and other pollutants in the air, reducing the “smog†phenomenon of the city and making the road Become a veritable "automatic air purifier".
"Although technology research and development is faced with cold numbers, technology itself is to serve people," Sochi said. The research and development of multi-functional pavement materials has achieved initial success. In the future, project research and development still needs to pay more attention to humanization issues, so that the results can better meet the needs of life.
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