Asphalt Binder Desulfurization Process Is Urgently Necessary to Handle
It is urgently necessary to handle a significant number of used tires, and it has been established that crushing used tires into crumb rubber powder for asphalt modification is a good solution.
what is Asphalt Binder Desulfurization
In this article, we are going to talk about the asphalt binder desulfurization process.
In addition to having good high and low-temperature performance, durability, and aging resistance, crumb rubber-modified asphalt can also lessen illnesses and noise on the pavement, which has numerous application possibilities.
Desulfurized crumb rubber modified asphalt was created in this work using a mechanochemical approach to desulfurize crumb rubber powder.
The physical properties of modified asphalt were examined after the effects of desulfurization process variables such as desulfurized type, desulfurized content, and desulfurization mixing temperature and duration were taken into account.
The test findings demonstrated that the viscosity of crumb rubber powder-modified asphalt might be decreased by mixing it with desulfurized.
Additionally, combining crumb rubber with a desulfurizer could increase the storage stability of asphalt modified with crumb rubber powder.
The desulfurization process of a chosen organic disulfide (OD) desulfurized was optimized as follows: the OD desulfurized content was 3%, the desulfurization mixing temperature was 160 °C, and the mixing time was 30 min.
This was done based on the physical characteristics of crumb rubber powder-modified asphalt.
In order to further investigate the desulfurized crumb rubber powder changed asphalt's modification method, Fourier infrared spectroscopy research was done.
The modification of asphalt by crumb rubber powder is primarily a physical alteration because there is no breakage and no creation of chemical linkages.
Numerous waste rubber tire products have accumulated due to the fast growth of the rubber and automotive industries.
By 2016, there were 13.
07 million tons of used tires in China, and that number is continually rising quickly every year.
China is predicted to have the largest collection of used tires worldwide.
The buildup of trash tires causes considerable environmental harm in addition to being a waste of rubber resources.
Recycling used rubber provides significant economic and societal benefits as a result.
It has been discovered that adding crumb rubber powder to asphalt as a modifier can successfully improve the bitumen's technical characteristics, enabling the modified asphalt mixture's road performance and service quality to satisfy the needs of road traffic operations.
The pavement can be kept in better condition for longer by using a crumb rubber-modified asphalt mixture, which has outstanding high and low-temperature performance, weatherability, elasticity, and anti-aging capabilities.
It can also be used to minimize pavement thickness and traffic noise.
The dry process rubber modification of asphalt mixtures, which is equivalent to polymer-modified mixtures, on the other hand, exhibits outstanding field performance.
Picado-Santos et al.
investigated the functional properties of a dry-process crumb rubber asphalt pavement that had been operational for eight years following restoration, including roughness, skid resistance, texture, and a quality index.
The comparison results demonstrated that dry-process crumb rubber asphalt pavement operated in a very robust manner.
In their analysis of the dry procedure for the inclusion of crumb rubber from waste tires, Rodriguez-Fernandez et al.
discovered that mixes containing crumb rubber have adequate performance and are less prone to aging than a typical polymer-modified combination.
The cracking and rutting performance of all the field sections was good to exceptional according to Rath et alinvestigation.
's into the impacts of a chemically engineered dry-process ground tire rubber modification in bitumen and mixes.
Although the crumb rubber powder used in regular crumb rubber modified asphalt was subjected to a vulcanization process, it had a relatively solid three-dimensional network structure and low activity, making it difficult to be compatible with asphalt and frequently accompanied by a significant amount of crumb rubber particles.
This is not the case for wet-process modified rubber asphalt.
Ordinary crumb rubber modified asphalt made from vulcanized crumb rubber powder has a number of drawbacks that restrict its development and use, including poor high-temperature storage stability, easy segregation, high viscosity, and complicated construction.
According to a pertinent study, desulfurization technology can be used to produce rubber powder with a high surface activity, which lowers the viscosity of vulcanized crumb rubber powder modified asphalt.
It has been demonstrated that the desulfurized crumb rubber modified asphalt has good storage stability, low-temperature performance, and workability.
Desulfurized crumb rubber-modified asphalt is also more environmentally beneficial since it emits fewer hazardous gases.
In order to increase the stability of crumb rubber modified asphalt, it is therefore required to desulfurize and activate the vulcanized crumb rubber powder.
Asphalt Process methods
Due to the drawbacks of standard crumb rubber-modified asphalt, researchers partially activated the desulfurization process on crumb rubber powder before creating desulfurized crumb rubber-modified asphalt.
Desulfurized crumb rubber-modified asphalt was first developed and tested in the United States in the 1970s.
Later, numerous studies focused on this issue; Ye et al.
used a fluorescence microscope to detect the characteristics of three different types of modified asphalt by observing the microstructure of three different types of crumb rubber powder in asphalt: regular crumb rubber powder, dynamic desulfurized crumb rubber powder, and high-speed shear desulfurized crumb rubber powder.
The findings indicated that dynamic desulfurization could reduce the performance of regular crumb rubber-modified asphalt while destroying the internal vulcanization structure of crumb rubber and improving the compatibility between crumb rubber powder and asphalt.
In addition to increasing the swelling capacity of asphalt crumb rubber powder, high-speed shear desulfurization also helps to prevent agglomeration.
Therefore, high-speed shear desulfurized crumb rubber powder can enhance the performance of asphalt.
Ibrahim et al.
created crumb rubber asphalt using scrap rubber that had been gamma-treated.
When compared to untreated crumb rubber, it was discovered that the qualities of crumb rubber modified asphalt created from gamma-treated waste rubber were greatly improved at higher temperatures, lower temperatures, and aging resistance.
Under the reaction circumstances of high temperature and high shear rate, Lin et al.
investigated the impact of crumb rubber dissolving on the physical characteristics of asphalt.
The outcomes demonstrated that crumb rubber molecules quickly disintegrated, deteriorated, and depolymerized under the conditions of high-temperature reaction, hence lowering their average molecular weight.
It is hypothesized that regular crumb rubber powder may undergo a desulfurization reaction at high temperatures, but that if the temperature is too high, crumb rubber-modified asphalt will age.
SEM, component analysis, and infrared spectroscopy were used by Ma et al.
to study the desulfurized crumb rubber changed asphalt modification mechanism and test the modified asphalt and mixture's performance on roads.
The outcomes demonstrated that desulfurized crumb rubber modified asphalt had a distinct modification process than regular crumb rubber modified asphalt.
The desulfurized crumb rubber powder can have a clear chemical reaction with asphalt, which causes the two to behave quite differently.
Desulfurized crumb rubber-modified asphalt, which is better for dense combinations than regular crumb rubber-modified asphalt, has a lower viscosity and higher storage stability.
Juganaru et al.
added crumb rubber that had been partially desulfurized to asphalt.
The dispersion of desulfurized crumb rubber in asphalt was more even when observed under a fluorescence microscope.
Desulfurized crumb rubber powder-modified asphalt had much higher adhesion than vulcanized crumb rubber-modified asphalt, which can make rubber asphalt easier to deal with.
Asphalt Binder Desulfurization Process
Numerous researchers have examined the conditions and desulfurization process of waste tire rubber powder, including the desulfurization procedure and popular desulfurization techniques.
According to the study, desulfurization of common crumb rubber powder could be induced by high temperature, high-speed shear, gamma radiation, and other factors.
After desulfurization, the crumb rubber powder's spatial structure changed and its molecular weight decreased, which significantly improved the powder's compatibility with asphalt and helped to address some of the flaws in crumb rubber modified asphalt, such as easy segregation and poor high-temperature storage stability.
There are, however, limited investigations on the desulfurized crumb rubber modified asphalt production method and the road performance of modified asphalt mixture.
A heat treatment based on the thermal environment, a chemical method using chemical adjuvants, and a mechanochemical method using chemical adjuvants combined with mechanical force to accelerate the chemical reaction are currently the most widely used methods for activating rubber desulfurization.
To increase the surface roughness and activity of rubber powder, the mechanochemical approach can be used to desulfurize and activate additives through broken rubber.
The mechanochemical approach is also well suited for large factory production because of its advantages of simple equipment, high production efficiency, low cost, and little smell.
As a result, desulfurized crumb rubber powder-modified asphalt was created in this work using a mechanochemical approach to desulfurize the crumb rubber powder.
Desulfurization's impacts on the physical characteristics and microscopic characterization of asphalt treated with crumb rubber powder were thoroughly investigated.
As the mixing temperature rises, it can be seen that the desulfurized crumb rubber powder modified asphalt's viscosity at 180 °C and softening point alter in a manner that is similar to that of other modified asphalt types.
The fall in viscosity at 180 °C and the softening point at mixing temperatures between 60 °C and 120 °C were both mild.
Desulfurized rubber powder-modified asphalt had significantly lower viscosity and softening point at 180 °C when the mixing temperature was 120 °C.
This is due to the desulfurization and activation of the crumb rubber powder under the influence of the OD desulfurized and mechanical force, which improved the compatibility of the powder with asphalt and reduced the size of the crumb rubber powder's particle core.
As a result, the desulfurized crumb rubber powder modified asphalt's high-temperature performance declined, and the corresponding viscosity somewhat dropped.
Desulfurized crumb rubber powder modified asphalt showed some similar variable trends in the penetration and ductility at 5 °C.
Desulfurized crumb rubber powder modified asphalt steadily rose with longer mixing times when the mixing temperature was lower than 120 °C.
When the mixing temperature was above 120 °C, desulfurized crumb rubber powder modified asphalt penetrated the asphalt much more deeply.
Desulfurized crumb rubber powder modified asphalt's ductility at 5 °C gradually improved with longer mixing times.
Analysis reveals that to increase the compatibility of crumb rubber powder with asphalt, OD desulfurized and mechanical force were used to desulfurize and activate it with the raw crumb rubber's original qualities.
The consistency of the desulfurized crumb rubber powder modified asphalt would be lowered and the related ductility could be improved when the desulfurized crumb rubber powder was used to alter base asphalt.
how can you buy asphalt and do this process
In conclusion, the desulfurization impact of crumb rubber powder was not readily apparent at low mixing temperatures, and the viscosity reduction of desulfurized crumb rubber powder modified asphalt was insufficient.
The mixing temperature must be greater than 120 °C concurrently.
As a result, for the tests that followed, mixing temperatures of 140 °C and 160 °C were used.
Desulfurized crumb rubber powder was then made and used to modify base asphalt under test settings that included mixing at 140 °C for 120 minutes.
It was discovered that while the viscosity of the modified asphalt greatly fell, so did the softening point.
However, because of the excessively long mixing time, it proved unsuitable for mass production.
Since this was the case, 160 °C was chosen as the ideal mixing temperature.
Desulfurized crumb rubber modified asphalt was created in this work using a mechanochemical approach to desulfurize crumb rubber powder.
The physical properties of modified asphalt were examined after the impacts of the desulfurization process factors, including desulfurized type, desulfurized content, and desulfurization mixing temperature and time had been taken into account.
For the desulfurization treatment, two commercial regenerants labeled as OMC, activators labeled as OD, as well as home-made desulfurized labeled as DES and crumb rubber powder, were used.
The viscosity of desulfurized crumb rubber powder modified asphalt can be reduced by the three desulfurized, of which OD and OMC can simultaneously lower the softening point;
The chosen OD desulfurizes desulfurization procedure is optimized as follows: the desulfurization mixing temperature is 160 °C, the desulfurization mixing period is 30 minutes, and the OD desulfurized concentration is 3%;
According to the Fourier infrared spectrum analysis, the desulfurization treatment had no effect on the functional groups of the asphalt that had been modified by crumb rubber powder, and the modification was primarily physical.
Future studies are urgently needed to determine the performance and defining characteristics of each modified asphalt binder as well as the impact desulfurization agents have on rubber.
you can conect us an buy high quality asphalt from our company.
read more:
Asphalt
asphalt emulsion
Asphalt PAH Biomarkers
Rubber Asphalt
How useful is this article to you?
Average Score
5
/
Number of votes:
1
