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CA砂浆干燥收缩与自身相对湿度研究
Drying Shrinkage and Relative Humidity of CA Mortar
投稿时间:2016-02-29  修订日期:2016-05-25
DOI:10.3969/j.issn.1007 9629.2017.03.018
中文关键词:  CA砂浆  相对湿度  收缩  离缝
英文关键词:CA mortar  relative humidity  shrinkage  crack
基金项目:国家自然科学基金资助项目(51408610);中国铁路总公司科技研究开发计划项目(2013G008 A 1)
           
作者单位
王涛
WANG Tao
中国铁道科学研究院金属及化学研究所,北京100081
Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
魏曌
WEI Zhao
中国铁道科学研究院金属及化学研究所,北京100081
Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
刘子科
LIU Zike
中国铁道科学研究院金属及化学研究所,北京100081
Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
李洪刚
LI Honggang
中国铁道科学研究院金属及化学研究所,北京100081
Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
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中文摘要:
      研究了水泥乳化沥青(CA)砂浆内部相对湿度与干燥收缩以及两者之间的相互关系.结果表明:CA砂浆内部相对湿度在早龄期时较高,之后随龄期延长而下降,且降幅在90d后趋缓;CA砂浆先膨胀后收缩,约7d时达到最大膨胀值,120d后收缩趋缓;水灰比(mW/mC)、乳化沥青水泥比(mA/mC)等配合比参数对CA砂浆内部相对湿度和干燥收缩的影响均不明显;在密封养护条件下,CA砂浆试件内部的相对湿度较大且降幅较小,而干燥收缩较少且增幅较小,到后期时比脱模时略有膨胀;不密封养护CA砂浆试件在后期时收缩明显,其相对湿度与干燥收缩线性相关性较好.所得结论可为CRTSⅠ型轨道减少板角离缝提供指导.
英文摘要:
      The relative humidity(RH) and drying shrinkage(DS) of CA mortar and the relationship between them were investigated. Results indicate that RH is high in early age, decreasing with increasing in the age, and slowing down after 90 d; CA mortar shrinks after an initial expansion, the highest expansion value appear at about 7 d,and shrinkage decreases down after 120 d;the parameters of mix proportion, such as water cement ratio(mW/mC), asphalt cement ratio(mA/mC), has no significant influence on RH and DS of CA mortar; under sealed curing, RH of CA mortar is higher and slightly reduces in late stage, and DS of CA mortar is lower and slightly increases, even has a slight expansion in long term. Under open condition, CA mortar undergoes a high shrinkage at late stage,DS and RH show significant linear relation, which can provide guidance for reducing the crack between slab corner and CA mortar layer in CRTSⅠtrack.
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