2014年7月上 施工技术 第43卷第13期 CONSTRUCTIONTECHNOLOGY 141 DOI:10. 7672/sgjs2014130141 布敦岩沥青改性沥青混合料低温抗裂性能试验研究* 高峰",王永志",李营营",文龙²,裴承润”,李国伟,李小薇” (1.许昌大成建设(集团)有限责任公司,河南许昌461000;2.北京市市政工程研究院,北京100037; 3.北京市公路桥梁建设集团有限公司,北京100068;4.北京市交通委员会路政局,北京100053; 5.孝义市住房和城乡建设局,山西孝义032300) [摘要】通过弯曲试验和冻断试验研究了经受紫外老化前后的布敦岩沥青(BRA)改性沥青混合料的低温抗裂性 能,结果表明:紫外老化前BRA改性沥青混合料破坏应变比基质沥青混合料提高248uE,冻断温度降低0.2℃C,变化 均不大;紫外老化后BRA改性沥青混合料比基质沥青混合料提高1310ut,提高幅度超过1倍。
这表明,BRA改性 沥青混合料在多因素耦合作用下的低温抗裂性能比基质沥青混合料更优,其路用性能衰变速率更慢。
同时,结合 试验结果提出了沥青混合料的开裂曲线,并尝试建立了沥青混合料的开裂计算模型。
[关键词]公路工程;浙青;布敦岩沥青;低温抗裂性能;试验; [中图分类号】U414【文献标识码】A[文章编号]1002-8498(2014)13-0141-04 ExperimentalResearch onLowTemperature Anti-cracking Performance ofBRAModifiedAsphaltMixtures (1.Xuchang Dacheng Construction (Group)Co.,Lad.,Xuchang,He’nan 461000,China; 2.Bejing Municipal Engineering Research Instiute,Bejing 100037,China: 3.Bejing Roads and Bridges Construction Group Co.,Ltd.,Beijing 100068, China; 4.Road Administration of Bejing MunicipalCommissionofTransport,Bejing100053,China; 5.Xiaoyi Municipal Bureau of Housing and Urban-Rural Deelopment,Xiaoyi,Shanxi 032300,China) Abstract;Bending test and freeze-off test were studied before and after aging the Buton rock asphalt (BRA) modified asphalt mixture with stand UV aging crack resistance at low temperature. The results show that UV aging former BRA modified asphalt mixture failure strain than asphalt mixes to improve 248μ,freeze-off temperature decreases 0.2°C. After UV aging BRA modified asphalt mixture than asphalt mixture at low temperature cracking resistance is better than the multivariate coupling matrix asphalt, the road performance slower decay rate. Meanwhile, bined with the test results, this paper presented cracking curve, and tried to establish a putational model of cracking of asphalt mixture. Key words:road construction; asphalt; Buton rock asphalt(BRA); low temperature anti-cracking performance;testing 0引言 点高、含氮量高、黏度大、抗氧化性和水敏感性强、 岩沥青是古代石油渗透在岩石夹缝中,经过长耐候性好、抗微生物腐蚀能力强、不含蜡、分子量 达亿万年的沉积、变化,在热、压力...