Improve Modified Bitumen with CR and PE Waste Additives
When compared with the characteristics of bitumen, experiments such as softening point, penetration, dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR), and bending-beam rheometer (BBR) were carried out. The inclusion of CR lowered the bitumen creep stiffness at low temperature, which in turn reduced the danger of brittleness and cracking, according to an analysis of the physical and rheological performance of modified bitumen binders. At the same time, the inclusion of PE resulted in an increase in the bitumen’s stiffness when it was heated and improve modified bitumen. Two continuous twisted phases were generated in the modified bitumen, which, according to the morphology study, suggested increased rheological property and high-temperature performance. The characteristics of the bitumen were collectively enhanced with the addition of CR and PE, and this effect was seen at both high and low temperatures. Because of this, the exploitation of these two waste products not only increased the performance of the pavement when combined with the modified bitumen, but it also reduced the amount of garbage that was thrown away in landfills.
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1- The characteristics of the bitumen were enhanced by integrated modification utilizing CR and PE. This improvement was seen at both high and low temperatures.
2- The rheological characteristics of the integrated modified bitumen and those of the SBS modified bitumen were found to be equivalent.
3- The economically beneficial effects of integrated modified bitumen are much more than those of SBS modified bitumen.
4- An examination of the economic benefits:
The ideal proportions of CR and PE in relation to base bitumen are 15 percent and seven percent, respectively. In this section, the economic advantage of the integrated modified bitumen was studied and contrasted with the modified bitumen used as a benchmark in the previous section. Because the PE was mixed into the hot aggregate in real time during the on-site manufacturing, the only modified bitumen that has to be prepared is CR modified bitumen.
The consultation that was conducted in China revealed that the cost of the SBS modified bitumen that was used in this investigation is $650 per ton. Table 5 presents the costs of integrated modification’s operations in addition to the costs of the associated materials and their respective pricing. According to the information that is provided in this table, the total cost to generate one ton of integrated modified bitumen by using CR and PE was determined to be $ 551.2. This amount is about $100 less than the cost to produce modified bitumen using SBS. In light of this, it should come as no surprise that the integrated modified bitumen offers a significant cost advantage over the commercial SBS modified bitumen.
In general, polymers can provide different features to improve modified bitumen, and we will list a few of them here:
1. Increasing bitumen’s soft point, which stops asphalt from rutting in the summer and heat.
2. Reducing the bitumen penetration level that prevents rainwater from penetrating the asphalt infrastructure.
3- Making bitumen more elastic or reversible, which, most crucially, lessens cracks brought on by the cold during the winter, increases the bitumen’s resistance to long-term deformations.
However, studies and findings have revealed that using polyethylene renders bitumen more brittle at low temperatures. This should be taken into account because utilizing polyethylene polymer in cold climates not only does not improve modified bitumen, but significantly degrades its qualities.
Although modified bitumen has many advantageous qualities, its price is higher than that of bitumen 60/70, and in many low-importance situations, it is not cost-effective, thus employers prefer to use less expensive bitumen.
From diverse scientific sources, compiled by the research team of PetroNaft Co.