CRTSⅠ型CA砂浆动态受压损伤试验

发布时间：2018-01-28 23:30

本文关键词： CA砂浆应变率抗压强度动态损伤损伤槛值　出处：《建筑材料学报》2014年05期 　论文类型：期刊论文

【摘要】：在电子万能试验机上对现场取样的水泥乳化沥青砂浆(CA砂浆)试件在应变率1×10-5~1×10-2s-1下进行动态单轴抗压试验,分析了动态荷载下CA砂浆的抗压强度、弹性模量及临界应变随应变率的变化规律.结果表明:CA砂浆的抗压强度随应变率的增加而增大,CA砂浆的抗压强度、弹性模量及临界应变与应变率之间呈幂函数关系,并给出了抗压强度、弹性模量及临界应变受应变率影响的经验公式.以切线模量的退化来度量CA砂浆的损伤程度,分析了CA砂浆动态损伤槛值随应变率的变化规律:当加载到相同的应变时,应变率越低,CA砂浆的损伤程度越严重;随着应变率的增大,CA砂浆损伤应力槛值及损伤应变槛值均增大;当应变率较高时,应变率对损伤应力槛值与平均抗压强度的比值和损伤应变槛值与平均临界应变的比值影响不大.
[Abstract]:Dynamic uniaxial compression tests of cement emulsified asphalt mortar (CA) specimens were carried out at strain rate of 1 脳 10 ~ (-5) and 1 脳 10 ~ (-2) s ~ (-1) on an electronic universal testing machine. The variation of compressive strength, elastic modulus and critical strain with strain rate of CA mortar under dynamic load is analyzed. The results show that the compressive strength of CA mortar increases with the increase of strain rate. The compressive strength, elastic modulus, critical strain and strain rate of CA mortar are power function, and the compressive strength is given. Empirical formula of elastic modulus and critical strain affected by strain rate. The damage degree of CA mortar is measured by the degradation of tangent modulus. The variation of dynamic damage threshold of CA mortar with strain rate is analyzed. The lower the strain rate is, the more serious the damage of CA mortar is. The damage stress threshold and damage strain threshold of CA mortar increase with the increase of strain rate. When the strain rate is high, the strain rate has little effect on the ratio of the damage stress threshold to the average compressive strength and the damage strain threshold to the average critical strain.
【作者单位】：西南交通大学高速铁路线路工程教育部重点实验室;西南交通大学土木工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2013CB036202) 国家自然科学基金资助项目(51008258,51208439)
【分类号】：TU578.1
【正文快照】： 向[1].CRTSⅠ型板式无砟轨道是一种应用最多、最为成熟的无砟轨道结构型式[2],由钢轨、扣件、轨道板、水泥乳化沥青砂浆(CA砂浆)充填层以及混凝土底座板等组成.其中CA砂浆是一种由水泥、乳化沥青、细骨料、水及铝粉等组成的有机-无机复合材料[3],是填充于板式无砟轨道的轨道板

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