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基于多应力蠕变回复试验的沥青结合料高温性能评价 被引量:18
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作者 王超 张金喜 +1 位作者 宋萍萍 王文涛 《北京工业大学学报》 CAS CSCD 北大核心 2013年第12期1849-1854,1860,共7页
为了更好地评价沥青结合料的高温路用性能,基于动态剪切流变仪(DSR)的应用,选用基质沥青和SBS改性沥青,在通过震荡试验确定沥青PG高温等级的基础上,采用多应力蠕变回复(MSCR)试验对比分析和评价了沥青结合料的高温抗车辙性能.结果表明,... 为了更好地评价沥青结合料的高温路用性能,基于动态剪切流变仪(DSR)的应用,选用基质沥青和SBS改性沥青,在通过震荡试验确定沥青PG高温等级的基础上,采用多应力蠕变回复(MSCR)试验对比分析和评价了沥青结合料的高温抗车辙性能.结果表明,现有规范中的震荡试验得到的车辙因子指标G*/sinδ可以很好地评价基质沥青的高温性能(不适用于改性沥青);而MSCR试验得到的回复率R能很好地表征改性沥青的延迟弹性,蠕变柔量J nr则可以考虑取代车辙因子作为沥青结合料高温性能评价的新指标.此外,SBS改性沥青的应力敏感性问题比基质沥青更为显著. 展开更多
关键词 沥青结合料 高温抗车辙性能 震荡试验 多应力蠕变回复试验
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常规设备对Superpave沥青路面永久变形的预测
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作者 张超 杨瑞华 孙洪燕 《中南公路工程》 2007年第3期90-93,共4页
优质路面(Superpave)沥青混合料组成设计方法中对永久变形的预测采用的方法和设备是一般试验设计单位无法满足的。利用沥青路面分析仪(APA)和马歇尔稳定仪研究了影响沥青混合料抗车辙性能的各个因素,并分析了间接拉伸强度和混合料的抗... 优质路面(Superpave)沥青混合料组成设计方法中对永久变形的预测采用的方法和设备是一般试验设计单位无法满足的。利用沥青路面分析仪(APA)和马歇尔稳定仪研究了影响沥青混合料抗车辙性能的各个因素,并分析了间接拉伸强度和混合料的抗车辙性能的关系,为合理预测沥青混合料的车辙病害提供了重要依据。 展开更多
关键词 沥青混合料 抗车辙性能 间接拉伸强度
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Grain boundary segregation induced strong UHTCs at elevated temperatures:A universal mechanism from conventional UHTCs to high entropy UHTCs
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作者 Fu-Zhi Dai Bo Wen +3 位作者 Yinjie Sun Yixiao Ren Huimin Xiang Yanchun Zhou 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2022年第28期26-33,共8页
Ultra-high temperature ceramics(UHTCs)exhibit a unique combination of excellent properties,including ultra-high melting point,excellent chemical stability,and good oxidation resistance,which make them promising candid... Ultra-high temperature ceramics(UHTCs)exhibit a unique combination of excellent properties,including ultra-high melting point,excellent chemical stability,and good oxidation resistance,which make them promising candidates for aerospace and nuclear applications.However,the degradation of hightemperature strength is one of the main limitations for their ultra-high temperature applications.Thus,searching for mechanisms that can help to develop high-performance UHTCs with good high-temperature mechanical properties is urgently needed.To achieve this goal,grain boundary segregation of a series of carbides,including conventional,medium entropy,and high entropy transition metal carbides,i.e.,Zr_(0.95)W_(0.05)C,TiZrHfC_(3),ZrHfNbTaC_(4),TiZrHfNbTaC_(5),were studied by atomistic simulations with a fitted Deep Potential(DP),and the effects of segregation on grain boundary strength were emphasized.For all the studied carbides,grain boundary segregations are realized,which are dominated by the atomic size effect.In addition,tensile simulations indicate that grain boundaries(GBs)will usually be strengthened due to segregation.Our simulation results reveal that grain boundary segregation may be a universal mechanism in enhancing the high-temperature strength of both conventional UHTCs and medium/high entropy UHTCs,since GBs play a key role in controlling the fracture of UHTCs at elevated temperatures. 展开更多
关键词 UHTCs High entropy ceramics Grain boundary segregation high-temperature strength Machine learning potential
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