Mechanism of aqueducts in cold and dry areas under effect of salt-frozen coupling erosion

doi:10.16265/j.cnki.issn 1003-3033.2020.11.007

Abstract

Abstract: In order to explore service performance of aqueduct in saline cold and arid areas of Northwest China, firstly, finite element simulation analysis of freezing and thawing cycle of aqueduct body was carried out using sequential coupled thermal stress analysis method. Then, freeze-thaw cycle tests were conducted on 3 types of concrete specimens, including reference, antifreeze and early strengthening water reducer, under erosion of Na₂SO₄ solutions at 4 mass concentrations. The results show that in finite element simulation, as number of freeze-thaw cycles increases, stress and strain values of aqueduct body also increase correspondingly which are mainly concentrated at junction of frozen areas. It is found through tests that quality loss rate and compressive strength loss rate of concrete specimens increase with rise in number of salt freezing, and their damage also gradually intensifies. Under erosion of salt solution at same mass concentration, damage degree of specimen ranks in descending order as antifreeze, reference and early strengthening water reducing agent group. Moreover, salt freezing will cause damage to aqueduct body, and in a long run, it will lead to decline of strength and stability of its structure, therefore affecting service life of water delivery project

Key words: salt freezing, cold and dry areas, aqueduct, finite element simulation, loss rate

CLC Number:

X935

GONG Li, KANG Chuntao, WANG Hong, YANG Yiqun, WANG Zhonghui. Mechanism of aqueducts in cold and dry areas under effect of salt-frozen coupling erosion[J]. China Safety Science Journal, 2020, 30(11): 43-52.

References

[1] 刘德仁,张东,张世民.北方寒冷地区封闭渡槽粘贴聚氨酯板提高保温效果[J].农业工程学报,2013,29(9): 70-75.
LIU Deren, ZHANG Dong, ZHANG Shimin. Increase insulation effect of polyurethane board pasting on closed aqueduct surface in cold regions[J]. Transactions of the Chinese Society of Agricultural Engineering, 2013, 29(9): 70-75.
[2] 张建伟,曹克磊,赵瑜,等.基于流固耦合模型的U型渡槽模态分析及验证[J].农业工程学报,2016,32(18): 98-104.
ZHANG Jianwei, CAO Kelei, ZHAO Yu, et al. Modal analysis and validation of U-shaped aqueducts based on fluid solid interaction model[J]. Transactions of the Chinese Society of Agricultural Engineering, 2016, 32(18): 98-104.
[3] 朱尔玉,刘椿,何立,等.预应力混凝土桥梁腐蚀后的受力性能分析[J].中国安全科学学报,2006,16(2):136-140.
ZHU Eryu, LIU Chun, HE Li, et al. Stress performance analysis on corroded pre-stressed concrete beam[J]. China Safety Science Joumal,2006,16(2):136-140.
[4] 吴文燕.冻融循环作用下不同加载速率的混凝土力学性能试验和数值模拟研究[D].西安:长安大学,2019.
WU Wenyan. Experimental and numerical study on mechanical properties of concrete under different loading rates and freeze-thaw cycles[D]. Xi'an:Chang'an University,2019.
[5] 匡亚川,陈煜杰,冯金仁,等.寒冷地区高速铁路桥梁冻融损伤研究[J].中国铁道科学,2019,40(2): 39-45.
KUANG Yachuan, CHEN Yujie, FENG Jinren, et al. Freezing-thawing damage of high speed railway bridge in cold region[J]. China Railway Science, 2019,40(2): 39-45.
[6] RAO Meijuan, LI Mingxia, YANG Huaquan, et al. Effects of carbonation and freeze-thaw cycles on microstructure of concrete[J]. Journal of Wuhan University of Technology, 2016, 31 (5): 1 018-1 025.
[7] SYLVIA K, CHARLOTTE T, CHRISTIAN U G, et al. Effect of freeze-thaw damage on chloride ingress into concrete[J]. Materials and Structures, 2017, 50 (2): 1-13.
[8] WANG Yue, AN Mingzhe, YU Ziruo, et al. Durability of reactive powder concrete under chloride-salt freeze-thaw cycling[J]. Materials and Structures, 2017, 50(1):1-9.
[9] 韩铁林,师俊平,陈蕴生,等.不同化学溶液和冻融循环作用下砂浆力学特征的研究[J].试验力学,2019,34(3): 489-500.
HAN Tielin, SHI Junping, CHEN Yunsheng, et, al. Experimental investigation on mechanical characteristics of mortar subjected to combined action of different chemical solutions and frezzing-thawing cycles[J]. Journal of Experimental Mechanics, 2019,34(3): 489-500.
[10] 赖海珍,陆程铭,荆慧斌,等.高寒地区复掺矿物掺合料水工混凝土抗冻耐久性劣化机理研究[J].水资源与水工程学报,2019,30(2): 191-197.
LAI Haizhen, LU Chengming, JING Huibin, et al. Study on frost resistance durability deterioration mechanism of hydraulic concrete with mineral mixed admixture in alpine regions[J]. Journal of Water Resources and Water Engineering, 2019,30(2): 191-197.
[11] 徐存东,程昱,王荣荣,等.带初始冻融损伤的混凝土材料受盐冻作用下性能劣化分析[J].工程科学与技术,2019,51(1): 17-26.
XU Cundong, CHENG Yu, WANG Rongrong, et al. Analysis of performance deterioration of concrete material with initial freeze-thaw damage under salt-freezing condition[J].Advanced Engineering Sciences, 2019,51(1): 17-26.
[12] 郑一峰,李龙,甘颜荣.除冰盐冻融环境下混凝土桥梁耐久性的模糊区间评价[J].中国安全科学学报,2012,22(9): 85-89.
ZHENG Yifeng, LI Long, GAN Yanning. Fuzzy interval evaluation method for durability of concrete bridges under de-icing salt andthawing environment[J]. China Safety Science Joumal,2012,22(9): 85-89.
[13] 段安,钱稼茹.混凝土冻融过程数值模拟与分析[J].清华大学学报:自然科学版,2009,49(9): 1 441-1 445.
DUAN An, QIAN Jiaru. Mathematical modeling and analysis of concrete subjected to freeze-thaw cycles[J]. Journal of Tsinghua University: Science and Technology, 2009,49(9): 1 441-1 445.
[14] 颉玉龙. 混凝土冻融破坏的数值模拟研究[D].哈尔滨:哈尔滨工业大学,2018.
XIE Yulong. Numerical simulation of freeze-thaw damage of concrete[D]. Harbin:Harbin Institute of Technology,2018.
[15] ZUBER B, MACHAND J. Predicting the volume instability of hydrated cement systems upon freezing using poro-mechanics and local phase equilibria[J].Matrials and Structures, 2004, 37: 257-270.
[16] 冀晓东,宋玉普,刘建.混凝土冻融损伤本构模型研究[J].计算力学学报,2011,28(3): 461-467.
JI Xiaodong, SONG Yupu, LIU Jian. Study on frost damage constitutive model of concrete[J]. Chinese Journal of Computational Mechanics, 2011,28(3): 461-467.
[17] 赵程. 混凝土冻融过程的细观数值模拟研究[C].中国力学大会-2017暨庆祝中国力学学会成立60周年大会论文集,2017: 586-596.
[18] 张国新. 高寒地区混凝土结构冻胀的数值模拟方法研究[C].中国水利学会第二届青年科技论坛论文集,2005: 505-510.
[19] 孙红运. 冻融环境下钢筋混凝土桥墩抗压性能研究[D].上海:上海交通大学,2017.
SUN Hongyun. Compressive behavior of reinforced concrete piers under freeze-thaw cycles[D]. Shanghai:Shanghai Jiaotong University,2017.
[20] GB/T 8075—2017,混凝土外加剂术语[S].
GB/T 8075-2017,Terms of concrete admixtures[S].
[21] GB/T 8076—2008,混凝土外加剂[S].
GB/T 8076-2008,Concrete admixtures[S].
[22] GB/T 50080—2016,普通混凝土拌合物性能试验方法标准[S].
GB/T 50080-2016,Standard for test method of performance on ordinary fresh concrete[S].
[23] GB/T 50081—2002,普通混凝土力学性能试验方法标准[S].
GB/T 50081-2002,Standard for test method of mechanical properties on ordinary concrete[S].
[24] GB/T 50082—2009,普通混凝土长期性能和耐久性能试验方法标准[S].
GB/T 50082-2009,Standard for test method of long-term performance and durability of ordinary concrete[S].
[25] 宿晓萍. 吉林省西部地区盐渍土环境下混凝土耐久性研究[D].长春:吉林大学,2013.
SU Xiaoping. Research on the concrete durability due to salinized soil in the western region of Jilin province[D]. Changchun:Jilin University,2013.
[26] 金海军,于继寿,李立辉,等.在硫酸盐环境下冻融-干湿循环对混凝土的影响[J].混凝土,2012(6): 46-50.
JIN Haijun, YU Jishou, LI Lihui, et al. Study on sulphate environment under freeze-thaw and dry-wet cycling of concrete[J]. Concrete, 2012(6): 46-50.
[27] 王泽坤. 冻融-干湿循环耦合损伤下粉煤灰混凝土碳化性能研究[D].保定:河北农业大学,2018.
WANG Zekun. Study on carbonation performance of fly ash concrete under freezing-thawing-wet-dry cycle coupling damage[D]. Baoding: Hebei Agricultural University,2018.