多维荷载对不同含水率混凝土渗透性的影响
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摘要
为研究多维荷载对不同含水率混凝土渗透性影响,利用ZYS-1煤岩多功能三轴渗透仪进行不同试验条件下三轴渗透性试验,研究了轴压、围压、孔隙压上升过程中渗透系数的变化趋势,并分别得出渗透系数特征曲线。试验结果表明:混凝土的渗透系数与轴压、围压呈负指数的关系;混凝土渗透系数对围压的敏感性更高,在围压较低时混凝土的渗透系数随围压变化较快;在围压或轴压的作用下,混凝土的渗透系数趋于稳定时,混凝土的渗透系数随着其含水率的增加呈现递减趋势且对混凝土含水率的敏感度逐渐降低。上述研究成果对研究和提升混凝土的耐久性具有重要意义。
The effect of multidimensional load on the permeability of concrete of varied water content is examined in this research by using ZYS-1 coal-rock multifunctional triaxial infiltration apparatus under different test conditions. The change trend of permeability coefficient during the climbing of axial compression, confining pressure, and pore pressure are analyzed, and the curves of permeability coefficient under such conditions are acquired respectively. Results illustrate that the permeability coefficient of concrete is in a negative exponential relationship with axial pressure and confining pressure, but is more sensitive to confining pressure, which is reflected in the swift change of permeability coefficient in the presence of low confining pressure. Under the action of confining pressure or axial compression, the permeability coefficient of concrete tends to be stable, and decreases with the increase of water content and gets less sensitivity to water content. The research findings are of great significance to enhancing the durability of concrete and the long-term performance of bridges.
The effect of multidimensional load on the permeability of concrete of varied water content is examined in this research by using ZYS-1 coal-rock multifunctional triaxial infiltration apparatus under different test conditions. The change trend of permeability coefficient during the climbing of axial compression, confining pressure, and pore pressure are analyzed, and the curves of permeability coefficient under such conditions are acquired respectively. Results illustrate that the permeability coefficient of concrete is in a negative exponential relationship with axial pressure and confining pressure, but is more sensitive to confining pressure, which is reflected in the swift change of permeability coefficient in the presence of low confining pressure. Under the action of confining pressure or axial compression, the permeability coefficient of concrete tends to be stable, and decreases with the increase of water content and gets less sensitivity to water content. The research findings are of great significance to enhancing the durability of concrete and the long-term performance of bridges.
引文
[1] DJERBI TEGGUER A,BONNET S,KHELIDJ A,et al.Effect of Uniaxial Compressive Loading on Gas Permeability and Chloride Diffusion Coefficient of Concrete and Their Relationship[J].Cement and Concrete Research,2013,52: 131-139.
[2] 桂强,秦敏峰,李克非. 水泥基材料气体渗透性研究进展[J]. 硅酸盐学报,2015,43(10):1500-1510.
[3] 李新宇,方坤河. 软水溶蚀作用下水工碾压混凝土渗透特性研究[J]. 长江科学院院报,2008,25(4):81-84,89.
[4] 刘洪珠,赵铁军,曹承伟,等. 轴压荷载作用对混凝土微裂缝和渗透性影响研究[J]. 混凝土,2016,317(3):1-4,11.
[5] 李永靖,邢洋,韩俊俊,等. 煤矸石集料混凝土气渗和碳化性能实验研究[J]. 非金属矿,2016,39(1):17-20.
[6] 洪雷,危行财,汪明刚. 单轴压荷载下掺合料对混凝土渗透性的影响[J]. 建筑材料学报,2013,16(1):143-146,152.
[7] 张朝辉,杨江金,任生元,等. 混凝土渗透性与耐久性的关系及提高抗渗性的方法[J]. 商品混凝土,2007,(6):25-27.
[8] 许越. 垃圾堆体固有渗透率及孔隙度演化特征试验研究[D]. 阜新:辽宁工程技术大学,2014.
[2] 桂强,秦敏峰,李克非. 水泥基材料气体渗透性研究进展[J]. 硅酸盐学报,2015,43(10):1500-1510.
[3] 李新宇,方坤河. 软水溶蚀作用下水工碾压混凝土渗透特性研究[J]. 长江科学院院报,2008,25(4):81-84,89.
[4] 刘洪珠,赵铁军,曹承伟,等. 轴压荷载作用对混凝土微裂缝和渗透性影响研究[J]. 混凝土,2016,317(3):1-4,11.
[5] 李永靖,邢洋,韩俊俊,等. 煤矸石集料混凝土气渗和碳化性能实验研究[J]. 非金属矿,2016,39(1):17-20.
[6] 洪雷,危行财,汪明刚. 单轴压荷载下掺合料对混凝土渗透性的影响[J]. 建筑材料学报,2013,16(1):143-146,152.
[7] 张朝辉,杨江金,任生元,等. 混凝土渗透性与耐久性的关系及提高抗渗性的方法[J]. 商品混凝土,2007,(6):25-27.
[8] 许越. 垃圾堆体固有渗透率及孔隙度演化特征试验研究[D]. 阜新:辽宁工程技术大学,2014.