Study on Low Temperature Crack Resistance of SMA-13 Asphalt Mixture in Coastal Area
The paper selects polyester fiber as an admixture and prepares SMA-13 semi-circular specimens with polyester fiber content of 0%,0.3%,0.35%,0.4%,0.45%and 0.5%.The lower semi-circular bending test of sodium sulfate-dry-wet cycle is carried out at different times,0,2,4,6,8 respectively.And the dry-wet cycle of water is used as a parallel control group.With the increase of the times of dry-wet cycles,the low temperature performance of the salt-dry-wet cycle specimen group and the parallel control group de-crease;salt-dry-wet cycle has more effect on the specimen than water-dry-wet cycle,and the low temperature performance degradation amplitude of the specimen after water-dry-wet cycle is small.The macro evaluation index KIC of polyester fiber specimens with 0.4%content has good performance under the condition of dry-wet cycle of each solution,and the measured data are higher than those of oth-er fibers.Combined with the SEM scanning electron microscope test,the polyester fiber with a content of 0.4%can form a better fiber mesh lap structure,conducive both to the improvement of the integrity of the specimen and to the uniform transmission of load.
asphalt mixturelow temperature crack resistanceSCB testSEM scanning electron microscope test
万方数据
维普
