摘要(Abstract):
采用简单性能试验机测试苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)占基质沥青质量分数分别为6%、 8%的干法SBS改性SMA-13型沥青玛蹄脂碎石混合料(SMA13)在不同试验温度、加载频率时的动态模量与相位角,并与常规的湿法SBS改性SMA13进行对比分析,建立各自的动态模量主曲线。结果表明:在低温5℃及常温20℃时,改性剂含量不同的干法SBS改性SMA13的动态模量差异较小,并且均比湿法SBS改性SMA13的动态模量小,表明干法SBS改性SMA13具有较好的低温柔性;在较高温度50、 60℃时,干法SBS改性SMA13的动态模量、弹性模量与黏性模量均比湿法SBS改性SMA13的大,说明干法SBS改性沥青的高温抗变形能力更强,高温稳定性更优。
关键词(KeyWords): 道路工程;苯乙烯-丁二烯-苯乙烯嵌段共聚物;沥青玛蹄脂碎石混合料;改性;动态模量
基金项目(Foundation): 国家自然科学基金项目(51908331)
作者(Author): 刘树堂,薛志超,刘兆新,马峥浩,刘源,张吉哲
DOI: 10.13349/j.cnki.jdxbn.20230306.001
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