The Latest Solution of Asphalt Pavement Cracking -- Zirconium Tungstate
Some asphalt pavements often have long, thin, split cracks or web, this kind of situation, we usually call it "cracking".
There are many reasons for cracking, and some vehicles overrun the load too much, and some asphalt material reasons, here we discuss briefly the material factors.
In general, the cause of asphalt pavement cracking of pavement is extreme temperature or temperature fatigue effect. In short, the asphalt pavement has experienced a large expansion and contraction, and once the temperature stress exceeds the fracture strength of asphalt concrete, cracks will arise. Moreover, the cracks in the road is just the beginning, the days later, more sun and rain and traffic rolling, asphalt mixture on the temperature changes will become increasingly sensitive, when the ambient temperature is too high, resulting in high temperature rut; temperature is too low, crack extension re-cracking. It will soon turn into a pothole, and eventually a collapse or even more serious road damage. As a result, pavement cracking is one of the typical diseases of asphalt pavement, the cost of road maintenance at the highway department is staggering every year.
If there is any effective and feasible way to prepare for the rainy day? More and more scholars have come to think that the key is to reduce the sensitivity of the asphalt road to temperature. As is known to all, asphalt mortar plays a decisive role in the performance of asphalt mixture during the process of asphalt synthesis. Therefore, a certain amount of low temperature negative thermal expansion material to the mortar to modify the asphalt is the key to improve the low temperature crack resistance of asphalt mixture. So who can complete the bridges and road protection? Some scholars think of the excellent performance of the negative thermal expansion material zirconium tungstate.
So, is it feasible to solve the problem of asphalt cracking with zirconium tungstate material? Some scholars have done some research on it. Zirconium tungstate is a new type of material. The research report shows that it has different thermal characteristics, such as thermal expansion and cold expansion, in the range of 0 ~ 1005K, some scholars believe that a certain amount of asphalt is added to the asphalt mortar, it can neutralize the thermal expansion and contraction effect of asphalt pavement, and greatly enhance the anti cracking ability of asphalt pavement. In the course of the study, scholars use zirconium tungstate instead of mineral powder as filler of asphalt mortar and compare with traditional asphalt, the results show that the advantage of zirconium tungstate modified asphalt is higher than traditional asphalt, which results in higher adhesion work and tensile strength. That is to say, the resistance to cracking increases greatly, and the disadvantage is that the water loss ability of zirconium tungstate is slightly weaker than traditional asphalt. With the deepening of research, the improvement and upgrading of zirconium tungate is only a matter of time.
The performance of the modified asphalt for zirconium tungstate is good, but to be honest,the cost of preparing zirconium tungstate material is still on the high side, and it is not practical for large-scale projects such as highway asphalt paving, this is also the distance from the laboratory to industrial promotion, but in any case, the use of zirconium tungstate modified asphalt is very promising.
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