POE/SBS/C_(5)复合改性沥青的制备与性能研究

Study on Preparation and Performance of POE/SBS/C_(5) Composite Modified Asphalt

建设"海绵城市"需要沥青具备优良的渗透性能和力学性能,目前改性沥青多以苯乙烯-丁二烯-苯乙烯嵌段聚合物(SBS)为主,但存在成本高以及因链段中含有双键导致稳定性不高的缺点。以聚乙烯-辛烯共聚物(POE)、SBS和石油树脂(C_(5))作为复合改性剂,硫作为交联剂对基质沥青进行改性,研究了POE/SBS掺量的比例以及C_(5)和硫磺在改性剂中的质量分数对改性沥青软化点、延度、针入度和黏度的影响规律,确定了综合性能较好的配比。结果表明,当POE/SBS比例为0.8:9.2,总质量分数为65%,C_(5)石油树脂质量分数为5%,硫磺质量分数为4%时综合性能较好,改性沥青软化点达到91.06℃,延度达到44.3cm,针入度达到35.9(0.1 mm),黏度达到30184 Pa·s,复合改性沥青混合料动稳定度达到11613次/mm,空隙率达到24.2%,黏韧性达到21.841 N·m,满足高黏改性沥青的要求,具有较好的高温稳定性和抗车辙能力。

The construction of a"sponge city"requires asphalt to have excellent permeability and mechanical properties.At present,styrene-butadiene-styrene block polymer(SBS)modified asphalt is predominant,but it has the disadvantages of high cost and low stability due to the double bond in the chain.In this paper,polyethylene-octene copolymer(POE),SBS,petroleum resin(C_(5))and sulfur were used as composite modifiers.The influence of POE to SBS ratio,the content of C_(5) and sulfur in the modifier on the softening point,ductility,penetration and viscosity of the modified asphalt were studied.The results showed that the comprehensive performance of modified asphalt was preferred when the ratio of POE to SBS was 0.8:9.2 with a total content of 65%in the modifier and the content of C_(5) petroleum resin and sulfur in the modifier was 5%and 4%respectively.The softening point of the modified asphalt reached 91.06℃,ductility reached 44.3 cm,penetration degree reached 35.9(0.1 mm),and viscosity reached 30184 Pa·s.The obtained modified asphalt mixture had dynamic stability of 11613 times/mm,porosity of 24.2%and viscosity toughness of 21.841 N·m,it meet the requirements of high-viscosity modified asphalt and had good high temperature stability and anti-rutting ability.