SBS及^(60)Co辐照SBS改性沥青的制备

Preparation Methods of Asphalt Modified by SBS and SBS Irradiated by ^(60)Co

通过苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)含量、助溶剂类型及用量、加工温度、加工时间、辐照剂量率和辐照剂量条件优化实验,对SBS改性沥青制备方法、60 Co辐照SBS制备方法及辐照SBS改性沥青制备方法进行研究;通过对改性沥青结合料制品各项性能指标测试,对制备方法进行评价。实验结果表明,质量分数为15%~20%的SBS,质量分数为15%~30%的助溶剂,混匀后在100~165℃下,100~200r/min机械搅拌20~30min,升温至180~210℃,100~200r/min机械搅拌90~140min,或120~160℃下,100~200r/min机械搅拌80~100min,制得的SBS改性沥青结合料性能较好;60 Co 0.75kGy/h剂量率、30kGy剂量、真空辐照的辐照SBS改性沥青结合料性能较好。

By optimizing conditions experiments of styrene-butadiene-styrene block copoly-mer （SBS）content,cosolvent type and dosage,processing temperature,processing time, the radiation dose rate and absorbed dose,the preparation methods of SBS modified asphalt, 60 Co irradiated SBS and irradiation SBS modified asphalt have been studied;by testing the performance index of modified asphalt cement it is to evaluate the preparation methods.The experimental results show that the mass fraction of SBS is 15%-20%,the mass fraction of cosolvent is 15%-30%,blending,then at 100-165℃,100-200 r/min mechanical agitation 20-30 min,at 180-210 ℃,100-200 r/min mechanical agitation 90-140 min;or at 120-160 ℃, 100-200 r/min mechanical agitation 80-100 min,in these conditions the modified asphalt cement is better;the asphalt cement modified by SBS which was irradiated by gamma rays from a 60 Co source in vacuum at 0.75 kGy/h,30 kGy have good performance.