| With the rapid development of China’s national economy,the traffic volume continues to grow.Under the working conditions of high-intensity vehicles and harsh weather conditions,many road sections are prone to cracking,local bulging,wavy rutting,potholes,sinkage and other diseases.In order to ensure the service quality and service life of the pavement,it is necessary to maintain the pavement with such diseases in time.As a kind of preventive maintenance technology,micro-surface treatment technology is vigorously promoted in China because of its high economic efficiency,fast opening traffic,anti-wear and anti-skid performance.At present,high carbon ferrochrome slag is mostly treated by stacking,and therefore resulted in its low utilization efficiency.Based on the scarcity of stone resources and the current situation of the low utilization efficiency,the feasibility and road performance of using high-carbon ferrochrome slag for micro-surfacing technology is studied in this thesis,which has good economic benefits.Besides,it realizes the reuse of industrial waste,which is beneficial to environmental protection and sustainable development of national economy.In order to prepare a modified emulsified asphalt with excellent performance for micro-surface mixtures,this thesis selects slow cracking and fast setting emulsifiers and SBR latex as raw materials for the preparation of modified emulsified asphalt,and conducts research and analysis of modified emulsified asphalt with different emulsifier amounts.Combined with the material properties and equipment conditions,five emulsifier content of modified emulsified asphalt is produced.The influence of emulsifier dosage on stability,high temperature and low temperature performance of modified emulsified asphalt was evaluated by standard viscosity test,1d storage stability,three index test,DSR test,BBR test and other tests on the emulsion and its evaporation residue The standard viscosity of asphalt was tested by the emulsion and its evaporated residue.Finally,the optimal dosage of emulsifier is 2.0%,and the modified emulsified asphalt prepared according to this dosage is stable,reliable and excellent performance.The particle size distribution,physical properties and chemical composition of high-carbon ferrochrome slag aggregate were tested by sieving test,basic aggregate properties test and chemical analysis to analyze the feasibility of its application as aggregate in the micro-surface mix.Subsequently,the grading design of high-carbon ferrochrome slag micro-surface mix was carried out,and the blending method and blending ratio of high-carbon ferrochrome slag was determined to replace 0-3mm aggregate according to 0%,20%,30%,40%,50% and 60% under the premise of satisfying the grading of MS-3 micro-surface minerals.Subsequently,the optimum oil to stone ratio at the micro-surface was determined by mixing test,wet wheel abrasion test with 1h water immersion,and load wheel sticky sand test for different high-carbon ferrochrome slag blending amounts of 8.3%,8.4%,8.5%,8.5%,8.5%,and 8.5%,respectively.The wear resistance,water stability,rutting resistance,high-temperature stability,low-temperature crack resistance,early strength,and skid resistance of the mixes with different amounts of high-carbon ferrochrome slag at the micro-surface were determined by the wet wheel wear test,rutting deformation test,high-temperature rutting test,low-temperature bending test,cohesive force test,structural depth test,and pendulum value test.Through the above road performance test and the analysis of scanning electron microscope imaging results,the optimal mixing ratio of high carbon ferrochrome slag is determined to be 30% under the premise of good comprehensive performance of the mixture and large mixing of high carbon ferrochrome slag.Under this ratio,the early strength,high temperature stability and low temperature crack resistance of the mixture are the strongest,and the other road performance can meet the specification requirements. |
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