混凝土在蒸养过程中的变形性能

doi:10.11896/cldb.17120058

材料导报

2019, Vol. 33

Issue (8): 1322-1327 https://doi.org/10.11896/cldb.17120058

无机非金属及其复合材料

混凝土在蒸养过程中的变形性能

李霖皓, 龙广成, 刘芳萍, 石晔, 马聪, 谢友均

中南大学土木工程学院,长沙 410075

Deformation Behavior of Concrete During Steam Curing

LI Linhao, LONG Guangcheng, LIU Fangping, SHI Ye, MA Cong, XIE Youjun

School of Civil Engineering, Central South University, Changsha 410075

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摘要为掌握蒸养过程中温度变化下混凝土的变形规律,改善蒸养混凝土的体积稳定性,采用改进的非接触式混凝土变形测试系统,研究了不同成分的混凝土在升温、恒温及降温等蒸养各阶段下的总变形和自收缩变形行为,分析了矿物掺合料、纳米颗粒、超吸水性树脂等对蒸养过程中混凝土变形的影响规律。结果表明,蒸养过程中混凝土变形呈现明显的三阶段变化特征,即升温期的快速膨胀变形阶段、恒温期的变形缓慢降低阶段以及降温期的变形快速下降阶段。相比于常温条件,蒸养过程中混凝土的自收缩变形速率显著增加,水灰比、粉煤灰、矿渣、纳米二氧化硅及超吸水性树脂的掺入均对蒸养过程中的混凝土的膨胀变形和自收缩变形有较大影响。

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关键词: 蒸养过程混凝土膨胀变形自收缩变形

Abstract: In order to grasp the deformation law of concrete under the temperature variation during steam curing, and ameliorate the volume stability of steam cured concrete, an improved non-contact concrete deformation test system was employed to study the total deformation and autogenous deformation of concrete with various compositions during heating, thermostatic and cooling process. And then the impacts of mineral admixtures, nano-particles and super absorbent polymers on concrete deformation during steam curing were analyzed. The results indicated that the deformation of concrete in steam curing process exhibited three stages, namely rapid expansion deformation in heating period, slow reduction of expansion deformation in 60 ℃ thermostatic period and sharp reduction of expansion deformation in cooling period. Compared to the standard curing, there was a significant increase in autogenous shrinkage deformation rate of concrete under steam curing condition. The factors that could exert an obvious influence on expansion and autogenous shrinkage of concrete during steam curing include water-cement ratio, doping of fly ash, slag, nano-silica and super absorbent polymer.

Key words: steam curing process concrete expansion deformaion autogenous shrinkage

出版日期: 2019-04-25 发布日期: 2019-04-28

ZTFLH:

TU528.01

基金资助: 高速铁路基础研究联合基金(U1534207)

通讯作者: scc2005@csu.edu.cn

作者简介: 李霖皓,男,中南大学土木工程学院,硕士研究生。主要研究方向为蒸养混凝土、煤矸石混凝土。龙广成,男,中南大学教授、博士生导师,教育部新世纪优秀人才

引用本文:

李霖皓, 龙广成, 刘芳萍, 石晔, 马聪, 谢友均. 混凝土在蒸养过程中的变形性能[J]. 材料导报, 2019, 33(8): 1322-1327.
LI Linhao, LONG Guangcheng, LIU Fangping, SHI Ye, MA Cong, XIE Youjun. Deformation Behavior of Concrete During Steam Curing. Materials Reports, 2019, 33(8): 1322-1327.

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http://www.mater-rep.com/CN/10.11896/cldb.17120058 或 http://www.mater-rep.com/CN/Y2019/V33/I8/1322

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