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拉应力作用下早龄期混凝土相对湿度响应试验研究

赵海涛 丁健 杨果 相宇 徐文 陈育志

赵海涛, 丁健, 杨果, 相宇, 徐文, 陈育志. 拉应力作用下早龄期混凝土相对湿度响应试验研究[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220134
引用本文: 赵海涛, 丁健, 杨果, 相宇, 徐文, 陈育志. 拉应力作用下早龄期混凝土相对湿度响应试验研究[J]. 西南交通大学学报. doi: 10.3969/j.issn.0258-2724.20220134
ZHAO Haitao, DING Jian, YANG Guo, XIANG Yu, XU Wen, CHEN Yuzhi. Experimental Investigation of Relative Humidity Response in Early-Age Concrete Under Tensile Stress[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220134
Citation: ZHAO Haitao, DING Jian, YANG Guo, XIANG Yu, XU Wen, CHEN Yuzhi. Experimental Investigation of Relative Humidity Response in Early-Age Concrete Under Tensile Stress[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20220134

拉应力作用下早龄期混凝土相对湿度响应试验研究

doi: 10.3969/j.issn.0258-2724.20220134
基金项目: 十四五国家重点研发计划(2021YFF0500800);国家自然科学基金(U1965105,51878245)
详细信息
    作者简介:

    赵海涛(1978—),男,教授,研究方向为混凝土早龄期性能与裂缝控制,E-mail:zhaoht@hhu.edu.cn

  • 中图分类号: TU528.1

Experimental Investigation of Relative Humidity Response in Early-Age Concrete Under Tensile Stress

  • 摘要:

    为系统研究早龄期混凝土内部相对湿度对不同水平拉应力的响应规律,设计恒定轴拉下混凝土内部相对湿度测试方法,试验研究了不同拉应力下的相对湿度响应规律,并基于试验结果和理论分析,给出早龄期混凝土单面干燥条件下相对湿度与拉应力的线性模型. 研究结果表明:拉应力施加会造成混凝土内部相对湿度瞬时下降,当拉应力从0.8 MPa增加到3.2 MPa时,混凝土深度分别为50、75、100 mm处的相对湿度变化值从0.5%、0.4%和0.3%增加到0.8%、0.7%和0.6%;随着拉应力逐渐增大,相对湿度下降值逐渐增大;在相同拉应力下,距离混凝土暴露面近的相对湿度对拉应力的响应更为显著;拉应力持荷状态下相对湿度会逐渐恢复,恢复时间约2.5 h,在压应力持荷状态下也出现了类似现象,恢复时间约20.0 h,拉应力持荷状态下相对湿度恢复时间更短.

     

  • 图 1  相对湿度测点位置及端部丝杆对中措施

    Figure 1.  Location of relative humidity measuring point and alignment method of end screws

    图 2  相对湿度测量

    Figure 2.  Relative humidity measurement

    图 3  拉应力状态下的相对湿度测量

    Figure 3.  Relative humidity measurement under tensile stress state

    图 4  不同拉应力水平下相对湿度曲线

    Figure 4.  Relative humidity curves under different tensile stress levels

    图 5  拉应力状态下水分重分布

    Figure 5.  Water redistribution under tensile stress state

    图 6  2.4 MPa拉应力下相对湿度和变形对比曲线

    Figure 6.  Comparison curves of relative humidity and deformation under tensile stress of 2.4 MPa

    图 7  压应力状态下的相对湿度曲线

    Figure 7.  Relative humidity curve under compressive stress state

    图 8  相对湿度与饱和度之间的关系

    Figure 8.  Relationship between relative humidity and saturation

    图 9  动弹性模量和静弹性模量与龄期的关系

    Figure 9.  Relationship between age and dynamic and static elastic moduli

    图 10  由相对湿度变化以及静、动弹性模量差产生的应变差值

    Figure 10.  Strain difference caused by static and dynamic modulus difference and relative humidity variation

    图 11  相对湿度变化引起应变差值拟合结果

    Figure 11.  Fitting results of strain difference caused by relative humidity variation

    图 12  ωd的线性回归

    Figure 12.  Linear regression of ω and d

    表  1  混凝土配合比

    Table  1.   Concrete mix proportion kg/m3

    材料名称水泥细骨料粗骨料减水剂
    配合比533.00160.00597.001110.004.33
    下载: 导出CSV

    表  2  加载试验方案

    Table  2.   Loading test scheme

    工况拉(压)应力/
    抗拉(压)强度/%
    施加拉(压)应力/MPa7 d 抗拉(压)强度/MPa截面面积/m2施加荷载/kN备注
    T1200.83.950.0187515拉力
    T2401.63.950.0187530拉力
    T3602.43.950.0187545拉力
    T4803.23.950.0187560拉力
    C12012.863.70.01875240压力
    下载: 导出CSV

    表  3  拉应力加载前后相对湿度和饱和度

    Table  3.   Relative humidity and saturation before and after tensile stress loading

    测点0.8 MPa1.6 MPa2.4 MPa3.2 MPa
    H1 /% (S1H2/% (S2H1 /% (S1H2/% (S2H1 /% (S1H2/% (S2H1/% (S1H2 /% (S2
    D10086.6
    (0.7941)
    86.3
    (0.7914)
    86.2
    (0.7905)
    85.8
    (0.7870)
    86.0
    (0.7887)
    85.5
    (0.7844)
    86.3
    (0.7914)
    85.7
    (0.7861)
    D7584.9
    (0.7794)
    84.5
    (0.7762)
    84.3
    (0.7746)
    83.8
    (0.7708)
    84.5
    (0.7762)
    83.9
    (0.7715)
    84.6
    (0.7770)
    83.9
    (0.7715)
    D5083.7
    (0.7700)
    83.2
    (0.7663)
    83.0
    (0.7649)
    82.4
    (0.7607)
    83.2
    (0.7663)
    82.5
    (0.7614)
    83.3
    (0.7671)
    82.5
    (0.7614)
    下载: 导出CSV
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  • 收稿日期:  2022-02-23
  • 修回日期:  2022-07-05
  • 网络出版日期:  2023-11-17

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