冻融循环条件下SBS改性沥青混合料的水稳定性研究

UNDER THE CONDITION OF FREEZE-THAW CYCLE SBS MODIFIED ASPHALT MIXTURE OF WATER STABILITY STUDIES

在我国北方寒冷地区,冬、春季更替时沥青路面材料长时间处于含水、低温冰冻状态及温度交替变化过程中,因水分和温度的共同作用引起的冻融循环而导致路面开裂现象较为普遍。本文对SBS改性沥青混合料试件进行多次冻融循环后进行劈裂试验,利用空隙率和冻融劈裂抗拉强度随冻融循环次数增加的变化规律来评价SBS沥青混合料的水稳定性。研究结果表明:SBS改性沥青混合料的强度及水稳定性受多次反复冻融影响衰减显著。

In the cold regions of northern China,when spring replaces winter the pavement material will be in water content,low temperature frozen state and temperature alternately in the process of change for a long time,which caused by freezing and thawing of the moisture and temperature lead to pavement cracking phenomenon is more common.I made SBS modified asphalt mixture specimen freezing and thawing cycles before the splitting test,using the variation of porosity and freeze-thaw splitting tensile strength increased with the freeze-thaw cycles to evaluate the SBS asphalt mixture waterstability.The results show that： the strength and water stability of SBS modified asphalt mixture by repeatedly freezing and thawing affect the attenuation significantly.