Studying the effect of using a mixture (synthetic polymer: natural polymer) on the rheological properties of asphalt

Abstract

The rheological modification of asphalt is currently the most important concern of workers in this field, whether a person is a chemist or a civil engineering worker. Several methods are used in rheological modulation processes. The rheological modification with polymeric materials is still the one that has taken the largest space in this field In this study, we dealt with the rheological modulation processes with polymeric mixtures. It used a mixture of materials that have proven effective in the field of rheological modulation and others that did not give the desired results. In this study, a mixture of a synthetic polymer, which is ethylpene vinyl acetate, and a natural polymer, which is wood, were used. Use this mixture with different weights of both polymers and for a total of 1 gram. The asphalt was treated with the above mixture with 1% by weight of sulfur at 180 ° C for a period of one hour The rheological properties of the modified samples were measured, which included measuring the ductility, penetration and softining point as well as calculating the penetration index coefficient and the percentage of the separated asphaltens. After that, the best sample obtained from the above treatment was taken and several interactions were conducted on it in order to determine each of: The optimum percentage of sulfur, The optimum temperature for modification process, The optimal time to perform the rheological modification processes, The effect of the addition process sequences on the properties of the axis asphalt was also studied. After that, the best sample obtained from this study was taken and was measured (Marshal, chemical immersion and as well as studying the effect of aging on this sample). The study gives good results in the field of asphalt resistance to the deformation processes that were carried out on it.

Effects of Different Natural Factors on Rheological Properties of SBS Modified Asphalt

“…CI H others = H all aging − H TO+UV aging H all aging − H unaged (7) where CI H TO is the contribution index of thermal oxygen to asphalt natural aging; CI H UV is the contribution index of UV action to asphalt natural aging; CI H others is the contribution index of other factors to asphalt natural aging; H TO aging is the complex modulus of thermal oxygen aging asphalt at 45 • C, kPa; H TO+UV aging is the rutting factor of thermal oxygen + UV aging asphalt, kPa; H All aging is the rutting factor of all-weather aging asphalt, kPa; and H unaged is the rutting factor of unaged asphalt, kPa. According to Equations ( 5)-( 7), the effects of thermal oxygen, UV light and other factors on natural aging were calculated.…”

“…Simulated environment factor is relatively single, which did not consider the interaction between multiple factors and the coupling effect. It also ignored the influence of rainfall, acid and alkali and various kinds of chemical medium, simulation results and the actual service environment of asphalt pavement is having a bigger difference [7]. In addition, the coupled action of different environmental factors impact on the asphalt performance has a bigger difference.…”