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长期荷载作用下水泥乳化沥青砂浆的徐变特性
Creep Characteristics of Cement Emulsified Asphalt Mortar under Long Term Load
投稿时间:2018-11-28  修订日期:2019-01-31
DOI:103969/j.issn1007 9629202002005
中文关键词:  水泥乳化沥青砂浆(CA砂浆)  徐变  荷载  应力水平  混凝土
英文关键词:cement emulsified asphalt mortar(CA mortar)  creep  load  stress level  concrete
基金项目:国家自然科学基金重大项目(11790283);高铁联合基金资助项目(U1534207)
              
作者单位
宋昊
SONG Hao
中南大学土木工程学院,湖南长沙410075
School of Civil Engineering, Central South University, Changsha 410075, China
曾晓辉
ZENG Xiaohui
中南大学土木工程学院,湖南长沙410075
School of Civil Engineering, Central South University, Changsha 410075, China
谢友均
XIE Youjun
中南大学土木工程学院,湖南长沙410075
School of Civil Engineering, Central South University, Changsha 410075, China
龙广成
LONG Guangcheng
中南大学土木工程学院,湖南长沙410075
School of Civil Engineering, Central South University, Changsha 410075, China
傅强
FU Qiang
西安建筑科技大学土木工程学院,陕西西安710055
School of Civil Engineering, Xian University of Architecture and Technology, Xian 710055, China
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中文摘要:
      连续测试了加载3a的水泥乳化沥青砂浆(CA砂浆)徐变,分析了应力水平对其徐变和徐变度的影响以及徐变后CA砂浆的力学性能与孔结构.结果表明:CA砂浆徐变速度远大于普通混凝土,应力水平为05时CA砂浆10d的徐变速度为普通混凝土的3~4倍,且徐变度是普通混凝土的几十倍;应力水平对CA砂浆的徐变有严重影响,在低应力水平下,徐变在300d后几乎不再增长,而高应力水平下,徐变在后期仍增加明显;徐变后的CA砂浆强度有所提高;Ⅱ型CA砂浆变形能力有明显退化,Ⅱ型CA砂浆的长期承载力仅为其抗压强度的40%左右;徐变使CA砂浆孔结构发生变化,应力水平对孔结构演化有较大影响,这可能与长期荷载作用下沥青黏性流动、界面滑移和水的迁移等有关.
英文摘要:
      The creep of cement emulsified asphalt mortar(CA mortar) loaded for 3 years was tested continuously. The influence of stress levels on the creep and creep degree of CA mortar was analyzed, and the mechanical properties and pore structure of CA mortar after creep were analyzed. The results show that the creep rate of CA mortar is much faster than that of ordinary concrete. The CA Mortar with a stress level of 05 is 34 times that of ordinary concrete in 10d, and the degree of creep of CA mortar is several dozen times that of ordinary concrete. The stress level has a serious impact on the creep of CA mortar. When the stress level is low, the creep does not increase after 300d, but at high stress level, the creep still increase significantly in the late stage. The strength of CA mortar after creep has increased, and the deformation ability of type Ⅱ CA mortar has been significantly degraded. The long term bearing capacity of type Ⅱ CA mortar is only about 40% of the compressive strength. The creep also changes the pore structure of CA mortar, and the stress level has a great influence on the pore structure evolution. This may be related to the viscous flow of asphalt, interface slip, and water migration under long term load.
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