Comparative Analysis Of Asphalt And Mixture Road Performance In Cold Environments

The quality and performance of pavement materials,a critical element of road construction,significantly affect the durability and driving safety of roads.Road materials confront great hurdles in colder regions from climatic conditions such extremely low temperatures,excessive humidity,melting of ice and snow,and are susceptible to a variety of low-temperature sicknesses.Asphalt mixture has the highest prevalence of cracking and pothole illnesses among popular pavement materials.Asphalt mixtures are vulnerable to cracking and damage because of the hardening and embrittlement of asphalt brought on by low temperatures combined with the impact of traffic loads.It is feasible to implement steps to enhance the performance of road materials,such as utilizing modifiers in asphalt or cold zone mix amounts,to address these issues.Also,an acceptable pavement structure design should be used,including settings for the reinforcement layer,drainage system,and thickness,to increase the pavement’s resilience to frost.To preserve the longevity and driving safety of the roads,it is crucial to take these illnesses and their treatments into account while designing and building roads in cold climates.To research asphalt pavement materials that can more easily withstand the cold in frigid climates.Four modifiers—SBS,Rubber powder,SBR,and TPS—are used in this study,with SBS modifiers serving as the primary modifier and the other modifiers also as auxiliary.With base asphalt that is 70#,90#,and 110#,composite modification is done.As the research subject,prepare 12 different types of composite modified asphalt,and use the fundamental performance test of asphalt to establish the ideal amount of modifier.The compatibility,interaction energy,and mechanical characteristics of asphalt and modifiers at various temperatures were examined using molecular dynamics simulation.To determine the high and low temperature rheological characteristics of various types of asphalt,dynamic shear rheological tests(DSR)and bending beam rheological tests(BBR)were performed on the modified composite asphalt.The density grading used in the asphalt mixture is AC-13.To determine the asphalt mixture’s water stability and resistance to high and low temperatures of cracking,several types of modified asphalt mixtures are subjected to freeze-thaw splitting,low temperature tiny beam bending,and high temperature rutting tests.Choose the varieties of modified asphalt that are best for pavement in cold climates by comparing their rheological performance indicators for high and low temperature and other road performance indicators.The findings of the molecular dynamics simulation demonstrate that the base asphalt in a range of grades has high compatibility with the modifier between 160 and 175 °C.Rubber powder and TPS modifier can help SBS modified asphalt’s high-temperature mechanical characteristics,while Rubber powder and SBR modifier can help SBS modified asphalt’s lowtemperature mechanical properties.The SBS/Rubber powder modified asphalt has the best rheological qualities at high and low temperatures,according to the findings of DSR and BBR tests.The 110# SBS/Rubber powder and 90# SBS/Rubber powder asphalt mixtures have the best road performance,The asphalt mixture’s road performance test reveals that the best modified asphalt blends for roads are 110#SBS/Rubber powder and 90# SBS/Rubber powder when low-temperature performance and water stability are the primary indicators and high stability is the auxiliary indicator.While 110# SBS/Rubber powder modified asphalt mixture is appropriate for regions with low winter temperatures and significant water damage,90#SBS/Rubber powder modified asphalt mixture is best for regions with high summer temperatures and little precipitation.