基于流变学的复合改性橡胶沥青黏弹特性研究

发布时间：2018-05-10 13:41

本文选题：流变学理论 + 橡胶沥青　；参考：《土木工程学报》2017年01期

【摘要】：基于流变学理论评价复合改性橡胶沥青的黏弹特性,采用动态剪切流变仪分别对基质沥青、改性沥青、不同添加剂下的复合改性橡胶沥青、干法橡胶颗粒及工厂化橡胶沥青进行滞回环试验,从残余变形、弹性贮能、耗散能、弹性比例和复合弹性模量等指标进行评价改性剂对橡胶沥青的复合改性作用及黏弹性能影响,并对试样进行应变扫描、温度扫描、频率扫描和时间扫描等常规动态剪切流变试验。结果表明:在高温条件下,复合改性橡胶沥青性能明显优于基质沥青和改性沥青;不同改性剂对橡胶沥青复合改性明显,其中PE改性剂可以提高橡胶沥青的抗永久变形能力,但是抗疲劳特性较差,岩沥青可以增加橡胶沥青的刚度、黏性流动和抗疲劳性能;脱硫胶粉与改性剂的溶胀作用明显;工厂化橡胶沥青和干法橡胶颗粒的抗疲劳特性明显,应根据不同应用场合的需求对橡胶沥青进行复合改性。
[Abstract]:Based on rheological theory, the viscoelastic properties of composite modified rubber asphalt were evaluated by dynamic shear rheometer. Dry rubber particles and industrial rubber pitch were tested by hysteresis loop test, from residual deformation, elastic energy storage, energy dissipation, The effects of modifier on the composite modification and viscoelastic properties of rubber asphalt were evaluated by elastic ratio and composite modulus of elasticity. The specimens were scanned by strain and temperature. Routine dynamic shear rheological tests such as frequency scanning and time scanning. The results show that the properties of the modified rubber asphalt are obviously better than those of the base asphalt and the modified asphalt at high temperature, and the composite modification of rubber asphalt is obvious with different modifiers, among which PE modifier can improve the resistance to permanent deformation of rubber asphalt. But the fatigue resistance is poor, rock asphalt can increase the stiffness, viscosity flow and fatigue resistance of rubber asphalt; the swelling effect of desulfurization rubber powder and modifier is obvious; the fatigue resistance of industrial rubber asphalt and dry rubber particles is obvious. Compound modification of rubber asphalt should be carried out according to the requirements of different applications.
【作者单位】：广西交通科学研究院;广西道路结构与材料重点实验室;高等级公路建设与养护技术材料及装备交通运输行业研发中心;西安建筑科技大学;
【基金】：西部交通建设科技项目(2011-318-788-1280)
【分类号】：U414

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