为了解水泥砂浆试件经海水侵蚀时的尺寸效应,分别采用3种尺寸的正方体试件放在硫酸钠溶液中侵蚀,后每隔一定时间取出部分试件进行单轴压缩试验,分析不同尺寸试件的单轴抗压强度、峰值应变和弹性模量的差异。研究结果表明试件经硫酸钠侵蚀时强度的尺寸效应存在一个临界值,随着试件尺寸的增加,侵蚀对强度的影响效应会呈现增加后减小的规律;不同尺寸的试件经硫酸钠侵蚀时,其峰值应变和弹性模量的差异没有强度的差异明显。
To study the size effect on the mechanical properties of cement mortar corroded by sodium sulfate solution, uniaxial compression tests were carried out on cement mortar specimens of three different sizes being corroded for a certain time in sodium sulfate solution. The differences of specimens in uniaxial compressive strength, strain at peak stress and elastic modulus were analyzed. The research result shows that the effect of erosion on the uniaxial compressive strength increased first and then decreased with the size of specimen reaching a critical value. The differences of strain at peak stress and elastic modulus were less significant than uniaxial compressive strength.
[1] 唐欣薇, 石建军, 郭长青, 等. 自密实混凝土强度尺寸效应的试验与数值仿真[J] . 水力发电学报, 2011, 30(3): 145-151.
[2] 陈 伟, 彭 刚, 周寒清. 不同应变速率条件下不同尺寸混凝土单轴试验应力应变分析[J] . 水电能源科学, 2014, 32(3): 134-137.
[3] 苏 捷, 方 志. 普通混凝土与高强混凝土抗压强度的尺寸效应[J] . 建筑材料学报, 2013, 16(6): 1078-1081.
[4] YI S T, YANG E I, CHOI J C. Effect of Specimen Sizes, Specimen Shapes, and Placement Directions on Compressive Strength of Concrete[J] . Nuclear Engineering and Design, 2006, 236(2): 115-127.
[5] SIM J I, YANG K H, KIM H Y, et al. Size and Shape Effects on Compressive Strength of Lightweight Concrete[J] . Construction and Building Materials, 2013, 38(2): 854-864.
[6] VISO J R D, CARMONA J R, RUIZ G. Shape and Size Effects on the Compressive Strength of High-strength Concrete[J] . Cement and Concrete Research, 2008, 38(3): 386-395.
[7] DEHESTANI M, NIKBIN I M, ASADOLLAHI S. Effects of Specimen Shape and Size on the Compressive Strength of Self-consolidating Concrete[J] . Construction and Building Materials, 2014, 66(6): 685-691.
[8] 梁咏宁, 袁迎曙. 硫酸盐腐蚀后混凝土单轴受压本构关系[J] . 哈尔滨工业大学学报, 2008, 40(4): 532-535.
[9] 张 峰, 祝金鹏 李术才, 等. 海水侵蚀环境下混凝土力学性能退化模型[J] .岩土力学, 2010, 31(5): 1469-1474.
[10] 熊良宵, 刘慈军. 海水侵蚀后水泥砂浆的单轴动态力学性能研究[J] . 岩石力学与工程学报, 2013, 32(12): 2481-2488.
[11] BRUNETAUD X, KHELIFA I M, AL-MUKHTAR M. Size Effect of Concrete Samples on the Kinetics of External Sulfate Attack[J] . Cement and Concrete Composites, 2012, 34(3): 370-376.
