基于MSCR与测力延度试验的阻燃改性沥青高低温性能评价  

Evaluation of High and Low Temperature Performance of Flame-retardant Modified Asphalt Based on MSCR and Force Ductility Test

作　　者：刘安刚 周庆福 胡义成 刘青海 王松林 LIU Angang;ZHOU Qingfu;HU Yicheng;LIU Qinghai;WANG Songlin(Hubei Changjiang Road and Bridge Co.Ltd.,Wuhan 430077,China;Urban Investment Operation Co.Ltd.,China of Construction Third Engineering Bureau,Wuhan 430070,China;School of Transportation,Wuhan University of Technology,Wuhan 430063,China;Hubei Highway Engineering Research Center,Wuhan 430063,China)

机构地区：[1]湖北长江路桥有限公司,武汉430077 [2]中建三局城市投资运营有限公司,武汉430070 [3]武汉理工大学交通与物流工程学院,武汉430063 [4]湖北省公路工程技术研究中心,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2022年第4期713-717,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：湖北长江路桥股份有限公司科研项目(CJLQ/BSGS/QTHT/002—2020)。

摘　　要：为了评价阻燃SBS改性沥青的高温抗车辙性能,制备了七种包含不同阻燃剂不同掺量的SBS改性沥青,采用不同温度下多重应力蠕变恢复试验测试改性沥青在蠕变加载过程中的应力响应特征,以0.1和3.2 kPa两种应力水平下的不可恢复蠕变柔量J_(nr)和蠕变恢复百分率R作为阻燃改性沥青的高温抗车辙性能评价指标.为了评价阻燃SBS改性沥青的低温抗裂性能,采用测力延度试验分析阻燃改性沥青的拉伸特性及拉伸变化机理,提取拉伸柔量f、韧性比R作为阻燃改性沥青的低温抗裂性能评价指标.结果表明:添加14%有机阻燃剂AP428的SBS改性沥青的平均回复率最大,随温度改变量最小;添加14%有机阻燃剂APA428的SBS改性沥青的韧性比最大;无添加的SBS改性沥青的拉伸柔量最小.综上所述,应选择阻燃剂的种类为有机阻燃剂AP428,适宜掺量为沥青质量的14%.In order to evaluate the high-temperature rutting resistance of flame retardant SBS modified asphalt,seven kinds of SBS modified asphalt with different flame retardants and different content were prepared.The stress response characteristics of modified asphalt during creep loading were tested by multiple stress creep recovery tests at different temperatures.The unrecoverable creep compliance Jnr and creep recovery percentage R under two stress levels of 0.1 and 3.2kPa were used as evaluation indexes of high temperature rutting resistance of flame retardant modified asphalt.In order to evaluate the low-temperature crack resistance of flame-retardant SBS modified asphalt,the tensile characteristics and tensile change mechanism of flame-retardant SBS modified asphalt were analyzed by force ductility test,and the tensile compliance F and toughness ratio R were extracted as the evaluation indexes of low-temperature crack resistance of flame-retardant modified asphalt.The results show that the average recovery rate of SBS modified asphalt with 14% organic flame retardant AP428 is the highest,and the change with temperature is the smallest.The toughness ratio of SBS modified asphalt with 14% organic flame retardant APA428 is the highest.The tensile compliance of SBS modified asphalt without addition is the smallest.The type of flame retardant should be selected as organic flame retardant AP428,and the appropriate dosage is 14% of the asphalt mass.

关 键 词：道路工程 阻燃改性 MSCR 测力延度 

分 类 号：U414.1[交通运输工程—道路与铁道工程]