石油学报（石油加工）
石油學報（石油加工）
석유학보（석유가공）
Acta Petrolei Sinica (Petroleum Processing Section)
2015年
5期
1187-1192
,共6页
梁明%辛雪%范维玉%罗辉%孙华东%邢宝东%南国枝
樑明%辛雪%範維玉%囉輝%孫華東%邢寶東%南國枝
량명%신설%범유옥%라휘%손화동%형보동%남국지
动态力学分析(DMA)%黏弹性能%动态剪切%废胶粉%改性沥青
動態力學分析(DMA)%黏彈性能%動態剪切%廢膠粉%改性瀝青
동태역학분석(DMA)%점탄성능%동태전절%폐효분%개성력청
dynamic mechanical analysis (DMA)%viscoelastic property%dynamic shear%waste rubber%modified asphalt
采用动态力学分析（DMA）方法，在动态剪切流变仪（DSR）上进行频率扫描实验，并利用广义Maxwell模型对实验结果进行拟合，得到胶粉改性沥青的离散松弛时间谱和零剪切黏度，并分析了胶粉粒径对胶粉改性沥青黏弹性能的影响。结果表明，在测定频率范围内，同一温度下改性沥青的损失模量（G″）大于储存模量（G′），且低频范围内两者差值较大；温度升高，G″和G′差别变大。在测定粒径范围内，G′和G″随胶粉粒径增加而增大，但粒径变化对胶粉改性沥青常规指标的影响较小。频率扫描结果与广义Maxwell模型拟合结果一致，计算出的零剪切黏度（η0）随胶粉粒径的增加而增加。胶粉以条状或棒状结构分散在沥青中，胶粉粒径减小，条状结构变小且分散更密集。
採用動態力學分析（DMA）方法，在動態剪切流變儀（DSR）上進行頻率掃描實驗，併利用廣義Maxwell模型對實驗結果進行擬閤，得到膠粉改性瀝青的離散鬆弛時間譜和零剪切黏度，併分析瞭膠粉粒徑對膠粉改性瀝青黏彈性能的影響。結果錶明，在測定頻率範圍內，同一溫度下改性瀝青的損失模量（G″）大于儲存模量（G′），且低頻範圍內兩者差值較大；溫度升高，G″和G′差彆變大。在測定粒徑範圍內，G′和G″隨膠粉粒徑增加而增大，但粒徑變化對膠粉改性瀝青常規指標的影響較小。頻率掃描結果與廣義Maxwell模型擬閤結果一緻，計算齣的零剪切黏度（η0）隨膠粉粒徑的增加而增加。膠粉以條狀或棒狀結構分散在瀝青中，膠粉粒徑減小，條狀結構變小且分散更密集。
채용동태역학분석（DMA）방법，재동태전절류변의（DSR）상진행빈솔소묘실험，병이용엄의Maxwell모형대실험결과진행의합，득도효분개성력청적리산송이시간보화령전절점도，병분석료효분립경대효분개성력청점탄성능적영향。결과표명，재측정빈솔범위내，동일온도하개성력청적손실모량（G″）대우저존모량（G′），차저빈범위내량자차치교대；온도승고，G″화G′차별변대。재측정립경범위내，G′화G″수효분립경증가이증대，단립경변화대효분개성력청상규지표적영향교소。빈솔소묘결과여엄의Maxwell모형의합결과일치，계산출적령전절점도（η0）수효분립경적증가이증가。효분이조상혹봉상결구분산재력청중，효분립경감소，조상결구변소차분산경밀집。
T he effects of particle size of crumb tire rubber on viscoelastic properties of modified asphalt were studied based on dynamic mechanical analysis .Frequency sweep tests were carried out on dynamic shear rheometer ,and corresponding results were fitted with a generalized Maxwell model to obtain discrete relaxation time spectrum and zero‐shear‐limiting viscosity of ground tire rubber modified asphalt . Furthermore , viscoelastic results were also verified by microscopy analysis .The frequency dependence of viscoelasticity displayed that the loss modulus of ground tire rubber modified asphalt was higher than its storage modulus at the same temperature in the studied frequency region .While the discrepancy was significant in the low frequency region as well as high temperature ,and both modulus increased as particle size increased ,contrasting that the evolution of the conventional indicator was not significant .Moreover ,a generalized Maxwell model fitted the results well and zero‐shear‐limiting viscosity enhanced with the increase of particle size .The rubber particles dispersed in asphalt in the form of bar shape and the dispersion of crumb rubber became more intensive with the reduction of particle size .
