文章摘要
基于DSR修正试验的老化沥青低温抗裂性能研究
Study On Low-Temperature Cracking Resistance of Aged Asphalt Based on DSR Correction Test
投稿时间:2024-02-27  修订日期:2024-03-29
DOI:
中文关键词: 道路工程  老化沥青  低温性能  DSR修正试验  评价指标  预估模型  
英文关键词: road engineering  aged asphalt  low-temperature performance  DSR modification test  evaluation index  prediction model  
基金项目:国家自然科学基金项目(编号:52278431);国家自然科学基金项目(编号:51608048);福建省交通科技项目(编号:202236)
作者单位
钟国亮 长安大学 
童以文  
刘亚敏* 长安大学公路学院 
韩旭晖  
高晨光  
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中文摘要:
      为客观全面地评价老化沥青胶结料的低温抗裂性能,本文提出了DSR修正低温试验方法,基于时间-温度等效原理,利用松弛模量G(60s)和松弛速率mr(60s)两个指标,对5种不同的沥青胶结料在不同老化水平下的低温抗裂性能进行了研究,结果表明:DSR修正试验方法适用于老化沥青胶结料的低温性能评价;对于基质沥青,其低温性能衰减最快出现在短期老化阶段,并且随着老化时间的增长,松弛模量G(60s)逐渐增大,松弛速率mr(60s)逐渐减小;对于改性沥青,其低温性能衰减规律与基质沥青基本一致,但存在一个平缓过渡期;建立了低温性能随老化时间的非线性预估模型。
英文摘要:
      In order to objectively and comprehensively evaluate the low-temperature anti-cracking performance of aged asphalt binder, this paper proposes the DSR modified low-temperature test method, based on the principle of time-temperature equivalence, the low-temperature anti-cracking performance of five different types of asphalt binders under different aging levels is investigated by utilizing the modulus of relaxation, G(60 s), and the rate of relaxation, mr(60s), The results show that: the modified DSR test method is suitable for evaluating the low-temperature performance of aged asphalt binder; for matrix asphalt, the fastest low-temperature decay occurs in the short-term aging stage, and with the growth of the aging time, the relaxation modulus G(60 s) gradually increases, and the relaxation rate mr(60s) gradually decreases; for modified asphalt, its low-temperature performance decay pattern is basically the same as that of the matrix asphalt, but there exists a smooth transition period; established a nonlinear prediction model of low-temperature performance with the aging time; recommended the use of low-temperature performance evaluation indexes of the residual value of the judgment as a basis for the engineering guidance, and put forward the corresponding technical requirements for different types of asphalt.
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