| 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. |
| 关键词: CA砂浆 相对湿度 收缩 离缝 |
| DOI：10.3969/j.issn.1007 9629.2017.03.018 |
| 分类号: |
| 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） |
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| Drying Shrinkage and Relative Humidity of CA Mortar |
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WANG Tao, WEI Zhao, LIU Zike, LI Honggang
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Metals and Chemistry Research Institute, China Academy of Railway Sciences, Beijing 100081, China
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| Abstract: |
| 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. |
| Key words: CA mortar relative humidity shrinkage crack |
