不同S/B比例的SBS改性沥青的分散形态及性能

以两种组成比例不同的SBS(791、792)为例，研究了S／B质量比对改性沥青分散形态与性能的影响。结果表明：S／B不同的SBS由于与沥青的相容性不同，对改性沥青的分散形态与性能有所不同。同等质量分数下，S／B高的SBS改性沥青的针入度较小。小用量范围内S／B低的改性沥青软化点高；用量超过5％后，S／B高的改性沥青软化点则较高。S／B低的改性沥青的5℃延度较好，弹性恢复率也较优。当SBS含量为5％时，S／B低的改性沥青的稳定性更好。

Morphology and Properties of SBS Modified Asphalt of Different S/B Ratio

The influence of varied S/B ratio of SBS on the morphology and proper ties of modified asphalt was studied. The r esults showed that the compatibility o f SBS with asphalt was different because of the varied S/B ratio of SBS, which m ade the morphology and properties of SBS mo dified asphalt different at same cont ent of SBS. The penetration of the modified asphalt with high S/B ratio was lowe r than that of the asphalt with low S/B rati o at the same concentration. The sof tening point of the modified asphalt with l ow S/B ratio was higher at small cont ent. When the content of SBS was more than 5 %, modified asphalt with high S/B ra tio had higher softening point. Modified as phalt with low S/B ratio had better d uctility as well as elastic recovery. The m odified asphalt with low S/B ratio had better stability at 5 % SBS content.