[1]杭美艳,孙忠科,郭艳梅.不同含气量对混凝土收缩性能的试验研究[J].西安建筑科技大学学报(自然科学版),2020,52(01):15-20.[doi:10.15986j.1006-7930.2020.01.003]
　HANG Meiyan,SUN Zhongke,GUO Yanmei.Effect of different air content on shrinkage property of concrete[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2020,52(01):15-20.[doi:10.15986j.1006-7930.2020.01.003]
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不同含气量对混凝土收缩性能的试验研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
52
期数:
2020年01期
页码:
15-20
栏目:
出版日期:
2020-03-31

文章信息/Info

Title:
Effect of different air content on shrinkage property of concrete
文章编号:
1006-7930(2020)01-0015-06
作者:
杭美艳1; 孙忠科1; 郭艳梅2
(1.内蒙古科技大学 土木工程学院,内蒙古 包头 014010; 2.呼和浩特建设工程质量监督站,内蒙古 呼和浩特 010020)
Author(s):
HANG Meiyan1;  SUN Zhongke1;  GUO Yanmei2
(1. School of Civil Engineering, Inner Mongolia University of Science & Technology, Inner Mongolia Baotou 014010, China; 2. Hohhot Construction Project Quality Supervision Station, Inner Mongolia Hohhot 010020, China)
关键词:
含气量;  早期收缩;  后期收缩;  图像处理;  孔隙率
Keywords:
air content;  early shrinkage;  later shrinkage;  image processing;  porosity
分类号:
TU528.042
DOI:
10.15986j.1006-7930.2020.01.003
文献标志码:
A
摘要:
通过试验研究了不同含气量对路面常用C35混凝土流动性、抗压强度、早期收缩、后期收缩的影响并通过图像处理的手段分析孔隙率和分级孔隙率对90 d收缩的影响.结果表明:混凝土的流动性随着含气量的升高先增大后减小,含气量为6.5%时坍落度达到最大值165 mm.抗压强度随含气量的升高而降低.混凝土的含气量越高对早期收缩变形的抑制越明显,当含气量为8.0%时72 h收缩率最小; 7 d以前混凝土的收缩率随着混凝土含气量的升高而减小; 14～90 d混凝土收缩率随着含气量的升高而增大.含气量为4.6%时混凝土的流动性、抗压强度和收缩性能得到较好的平衡.图像法分析可知孔隙率越大90 d混凝土收缩率越大,其中孔径为1 000～2 000 μm的气孔对90 d收缩贡献最大而10～100 μm的气孔对90 d收缩贡献最小.该方法简便快捷为今后工程应用提供了很好的理论依据.
Abstract:
In this paper, the effects of different air content on the fluidity, compressive strength, early shrinkage and late shrinkage of C35 concrete are studied experimentally, and the effects of porosity and graded porosity on 90 day shrinkage are analyzed by means of image processing. The results show that the fluidity of concrete increases first and then decreases with the increase of air content, and the maximum slump is 160 mm when air content is 6.5%, and the compressive strength decreases with the increase of air content. The higher the air content of concrete, the more obvious the restraint of early shrinkage deformation. When the air content is 8.0%, the shrinkage rate of 72 hours is the smallest; before 7 days, the shrinkage rate of concrete decreases with the increase of air content of concrete; and after 14 days to 90 days, the shrinkage rate of concrete increases with the increase of air content. When the air content is 4.6%, the fluidity, strength and shrinkage of concrete can be well balanced. The image analysis shows that the larger the porosity is, the larger the shrinkage of concrete in 90 days. The pore size of 1 000～2 000 μm contributes the most to the shrinkage in 90 days, while the pore size of 10～100 μm contributes the least to the shrinkage in 90 days. This method is simple and fast, which provides a good theoretical basis for future engineering applications.

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备注/Memo

备注/Memo:
收稿日期:2019-03-15修改稿日期:2020-01-17基金项目:内蒙古自然科学基金项目(2018MSO534)第一作者:杭美艳(1964-),女,教授级高工,硕士生导师,主要从事新型混凝土及混凝土外加剂、固体废弃物的建材化方面的研究.E-mail:136100841@qq.com通讯作者:孙忠科(1995-),男,硕士研究生,主要从事超高性能混凝土力学性能和普通混凝土耐久性研究.E-mail:sunzhongke66@163.com
更新日期/Last Update: 2020-04-25