Research on the Road Performance of Solvent Based Cold Patch Asphalt Mixture
Based on similar compatibility theory and volatility screening three organic solvents,mixed with linear SBS modifier,SK70#A grade asphalt to make a new solvent-based cold patch asphalt,using simplex-centroid design method to determine the ratio of each component,through the rotary viscosity,adhesion,storage stability,volatility index to evaluate its performance.Based on the empirical formula method and paper tracing method to determine the cold patch oil to stone ratio,according to the early strength of the preferred molding and curing process,to investigate the pavement performance of cold patch asphalt mixture including self-made,a-type,ZY-type,emulsification type.The results show that the best performance of asphalt cold patch with 65％solid content,35％diluent and 3％linear SBS,and the difference of upper and lower rotational viscosity is 968 MPa·s,the volatility of three days is 7.3％,and the adhesion reaches the level 5 of boiling method;the best oil-stone ratio of LB grade cold patch is 4.5％,the early strength of second compaction and 60 ℃ curing molding reaches 9.53 kN,strength formation in 2 d and the early strength of cold patch is significantly increased to 9.53 kN after 1％cement is mixed inside.The early strength of cold patching material is significantly increased to 13.44 kN,which indicates that the internal cementing can effectively improve the early strength of solvent type cold patching material;the improved graded self-made cold patching material has better pavement performance compared with a-typecold patch asphalt mixture and ZY-type cold patch asphalt mixture,and the water stability is better than emulsified cold patching material,and it also overcomes the shortcomings of conventional solvent type cold patching material such as slow formation of early strength and poor durability.
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