Characteristics and evaluation standards of asphalt pavement pit repair materials
In order to establish a reasonable evaluation method of pit repair materials,which can be used to select repair materials with excellent performance and suitable for specific environment.The construction performance and road performance of the repair material were tested by blade resistance test,boiling test,rolling screen test,Marshall stability test,rutting test,low-temperature bending creep test and freeze-thaw split test,which were used to revise the evaluation standard of the repair material.The results showed that the adhesion grade,residual rate of rolling screen and water stability of the repair material should not be less than Grade 4,60%and 75%,respectively.The dynamic stability and maximum bending strain of hot repair material should not be less than 800 times·mm-1 and 2 300 με,respectively.And cold repair material should not be less than 600 times·mm-1 and 900 με.In terms of construction and ease,for non-storable repair materials,it is recommended to mix on site and complete the repair work as soon as possible within 30 min after preparation,and the mixing torque needs to be less than 40 N·m.In addition,the cold pit materials of cement emulsified asphalt and epoxy resin have high initial strength and high-temperature stability,which can achieve the purpose of rapid repair.It is recommended that the initial stability should not be less than 2 kN.
asphalt pavementpit repairrepair materialsrepair material performanceevaluation indicators
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