长沙理工大学学报（自然科学版）2025，Vol.22Issue(5)：44-53,10.DOI:10.19951/j.cnki.1672-9331.20250114001
热致形状记忆聚氨酯改性沥青自愈合性能研究
Study on self-healing properties of thermally induced shape memory polyurethane modified asphalt
摘要
Abstract
[Purposes]This paper aims to enhance the self-healing performance of asphalt materials and achieve timely and effective healing of cracks in asphalt pavements during service.[Methods]The thermally induced shape memory polyurethane(SMPU)prepolymer was prepared by the prepolymer method to modify the matrix asphalt,and the SMPU-modified asphalt(SMPU-MA)was prepared.The dynamic shear rheometer(DSR)was used to test SMPU-MA under fatigue,healing,and fatigue cyclic loading in time-scanning mode.The decay rate of dynamic shear modulus H4(a smaller H4 value indicates better self-healing performance)before and after the intermittent interval was used as an index to analyze the changing trend of SMPU-MA's self-healing performance under different conditions.The relationship between shape recovery rate and self-healing performance of SMPU-MA was established.[Findings]The self-healing performance of SMPU-MA improves with increasing rintermittent interval at the same damage level.At a damage level of 60%,the self-healing index H₄ of SMPU-MA decreases by 30.92%and 72.11%compared with that of the matrix asphalt after intermittent intervals of 600 s and 3 600 s,respectively.Under the same intermittent interval,a higher damage level leads to a more pronounced improvement in the self-healing performance of SMPU-MA.When the intermittent interval is 3 600 s,and the damage levels are 20%,40%,and 60%,the self-healing index H₄ of SMPU-MA decreases by 54.38%,56.47%,and 72.11%,respectively,compared with the matrix asphalt.The shape recovery rate of SMPU-MA is linearly and negatively correlated with H4,and the coefficient of determination is as high as 0.953 9.[Conclusions]Modifying the matrix asphalt with SMPU to enhance its shape memory characteristics plays a crucial role in improving the self-healing performance of asphalt materials.关键词
改性沥青/热致形状记忆聚氨酯/自愈合性能/形状记忆特性/形状恢复率Key words
modified asphalt/thermally induced shape memory polyurethane/self-healing performance/shape memory characteristic/shape recovery rate分类
交通工程引用本文复制引用
冯新军,朱俊杰,任泓宇,黄拓..热致形状记忆聚氨酯改性沥青自愈合性能研究[J].长沙理工大学学报（自然科学版）,2025,22(5):44-53,10.基金项目
国家自然科学基金项目(52178415) （52178415）
湖南省自然科学基金项目(2021JJ30709) （2021JJ30709）
河南省交通运输学会科研项目(YJXHZD202401) National Natural Science Foundation of China(52178415) （YJXHZD202401）
Natural Science Foundation of Hunan Province(2021JJ30709) （2021JJ30709）
Scientific Research Project of the Henan Transportation Society(YJXHZD202401) （YJXHZD202401）
