西安建筑科技大学学报(自然科学版)

通过室内硫酸盐侵蚀试验及直剪试验,研究了高、低浓度硫酸盐侵蚀下不同水灰比混凝土抗剪强度受损劣化规律.试验结果表明:混凝土抗剪性能随硫酸盐侵蚀时间的增加逐渐衰退.具体表现为混凝土试件名义粘聚力和名义剪胀率随硫酸盐侵蚀时间的增长呈现逐渐减小的变化规律,且高浓度硫酸盐溶液下试件抗剪强度损失更显著; 而试件内摩擦角在低浓度下呈现非线性降低趋势,在高浓度下呈现先短暂增加后减小的趋势.

Through indoor sulfate corrosion test and direct shear test, the shear strength reduction law of concrete with different water cement ratio under high and low concentration sulfate attack is studied. The test results show that the shear resistance of concrete gradually declines with the increase of sulfate attack time. The specific performance is that the nominal cohesion and the nominal shear expansion rate of concrete specimens gradually decrease with the increase of erosion time, and the shear strength loss of specimens under high concentration of sulfate solution is more significant; while the internal friction angle of concrete specimens shows a nonlinear decreasing trend at low concentration, and increases briefly and then decreases at high concentration.

引言
1 试验概况
2 试验结果与分析
3 结论

表1 试验用水泥化学组分表<br/>Tab.1 Chemical composition of cement for test

表1 试验用水泥化学组分表
Tab.1 Chemical composition of cement for test

表2 每立方米混凝土试件配合比表<br/>Tab.2 Mix proportion of concrete specimen per cubic meter

表2 每立方米混凝土试件配合比表
Tab.2 Mix proportion of concrete specimen per cubic meter

表3 试验工况一览表<br/>Tab.3 Test condition table

表3 试验工况一览表
Tab.3 Test condition table

图1 直剪装置示意图<br/>Fig.1 Schematic diagram of direct shear device

图1 直剪装置示意图
Fig.1 Schematic diagram of direct shear device

图2 不同侵蚀时间下混凝土试件峰值剪应力与轴向压力的试验数据及拟合曲线<br/>Fig.2 Experimental data and fitting curve of peak shear stress and axial pressure of concrete specimens under different erosion time

图2 不同侵蚀时间下混凝土试件峰值剪应力与轴向压力的试验数据及拟合曲线
Fig.2 Experimental data and fitting curve of peak shear stress and axial pressure of concrete specimens under different erosion time

图3 混凝土试件抗剪强度参数随硫酸盐侵蚀时间的关系曲线<br/>Fig.3 Relation curve of shear strength parameters of concrete specimens with sulfate attack time

图3 混凝土试件抗剪强度参数随硫酸盐侵蚀时间的关系曲线
Fig.3 Relation curve of shear strength parameters of concrete specimens with sulfate attack time

图4 混凝土试件剪胀率随硫酸盐侵蚀时间的关系曲线<br/>Fig.4 Relation curve of shear expansion rate of concrete specimen with sulfate attack time

图4 混凝土试件剪胀率随硫酸盐侵蚀时间的关系曲线
Fig.4 Relation curve of shear expansion rate of concrete specimen with sulfate attack time

图5 混凝土试件内摩擦角随硫酸盐侵蚀时间的关系曲线<br/>Fig.5 Curve of internal friction angle of concrete specimen with sulfate attack time

图5 混凝土试件内摩擦角随硫酸盐侵蚀时间的关系曲线
Fig.5 Curve of internal friction angle of concrete specimen with sulfate attack time

[1] 刘勇. 氯盐侵蚀对混凝土微观结构损伤的影响研究[J]. 西安建筑科技大学学报(自然科学版), 2020, 52(3): 390-395.
[2]卢峰. 海洋环境下混凝土硫酸盐腐蚀研究[D]. 青岛: 青岛理工大学, 2012.
[3]肖东. 邻近(连接)桥梁桩基础与高铁路基耦合变形研究[D]. 成都: 西南交通大学, 2019.
[4]Z Zhongya, J Xiaoguang, L Wei. Long-term be-haviors of concrete under low-concentration sulfate attack subjected to natural variation of environmental climate conditions[J]. Cement and Concrete Research, 2019, 116:217-230.
[5]陈伟, 李宗刚, 李博. 聚合硫酸铝改性矿渣硅酸盐水泥水化及其抗氯离子渗透性能研究[J]. 硅酸盐通报, 2020, 39(5):43-49.
[6]YU X T, CHEN D, FENG J R, et al. Behavior of mortar exposed to different exposure conditions of sulfate attack[J]. Ocean Engineering, 2018, 157(1): 1-12.
[7]牛荻涛,王家滨,马蕊.干湿交替喷射混凝土硫酸盐侵蚀试验[J].中国公路学报,2016, 29(2): 82-89.
[8]HAUFE J, VOLLPRACHT A. Tensile strength of concrete exposed to sulfate attack[J]. Cement and Concrete Research, 2019, 116:81-88.
[9]A Tai Ikumi, I S A B, S H P C C. Effects of biaxial confinement in mortars exposed to external sulfate attack[J]. Cement and Concrete Composites, 2019 95(1): 111-127.
[10]CHEN D, YU X, GUO M, et al. Study on the mechanical properties of the mortars exposed to the sulfate attack of different concentrations under the triaxial compression with constant confining pressure[J]. Construction and Building Materials, 2017, 146(15): 445-454.
[11]韩宇栋, 张君, 高原. 混凝土抗硫酸盐侵蚀研究评述[J]. 混凝土, 2011(1): 52-56,61.
[12]苑立冬, 牛荻涛, 姜磊,等. 硫酸盐侵蚀与冻融循环共同作用下混凝土损伤研究[J]. 硅酸盐通报, 2013, 32(6):1171-1176.
[13]纪广. 超细微粉对水泥胶砂抗硫酸盐侵蚀的性能研究[D]. 兰州:兰州交通大学, 2020.
[14]JIN Zuquan, SUN Wei, JIANG Jinyang, et al. Damage of concrete attacked by sulfate and sustained loading[J]. Journal of Southeast University, 2008, 24(1): 69-73.
[15]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.
[16]XIAO Dong, JIANG Guanlu, LIAO Dan, et al. Influence of cement-fly ash-gravel pile-supported approach embankment on abutment piles in soft ground[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2018, 10(5): 977-985.

备注

引言

1 试验概况

2 试验结果与分析

3 结论

期刊信息