基于凝胶渗透色谱法的改性沥青中SBS降解行为研究

基于凝胶渗透色谱法的改性沥青中SBS降解行为研究摘要本研究采用凝胶渗透色谱法对改性沥青中的SBS降解行为进行了研究。结果表明，随着SBS含量的增加，改性沥青的抗拉强度下降，贯穿性和弯曲性也出现了相应的

SBS 基于凝胶渗透色谱法的改性沥青中降解行为研 究 摘要 本研究采用凝胶渗透色谱法对改性沥青中的SBS降解行为进行了研 究。结果表明，随着SBS含量的增加，改性沥青的抗拉强度下降，贯穿 性和弯曲性也出现了相应的变化。在降解过程中，SBS的分子量分布范 围逐渐扩大，分子量平均值升高，终止反应的SBS分子逐渐增多。SBS 对改性沥青的力学性能和降解行为具有显著的影响。 关键词：凝胶渗透色谱法，SBS，改性沥青，降解行为，力学性能 Abstract Inthisstudy,thedegradationbehaviorofSBSinmodified asphaltwasstudiedusinggelpermeationchromatography.The resultsshowedthatwiththeincreaseofSBScontent,thetensile strengthofmodifiedasphaltdecreased,andthepermeabilityand flexibilityalsochangedaccordingly.Duringthedegradation process,themolecularweightdistributionrangeofSBSgradually increased,theaveragemolecularweightincreased,andthe terminatedSBSmoleculesgraduallyincreased.SBShasa significantinfluenceonthemechanicalpropertiesand degradationbehaviorofmodifiedasphalt. Keywords:Gelpermeationchromatography,SBS,modified asphalt,degradationbehavior,mechanicalproperties 1.Introduction Modifiedasphaltreferstotheadditionofvariousmodifiersto theasphalttoimproveitsperformance.Amongthem, styrene-butadiene-styrene(SBS)isoneofthemostcommonly usedmodifiers,whichcansignificantlyimprovethe high-temperaturestabilityandlow-temperatureflexibilityof asphalt.However,thedegradationofSBSduringtheservicelifeof asphaltcanaffectitsperformance,andthereiscurrentlyalackof researchonthedegradationbehaviorofSBSinmodifiedasphalt.