盐冻耦合环境下再生砖粉ECC的耐久性研究

摘要/Abstract

摘要： 利用再生砖粉取代工程水泥基复合材料(ECC)中的石英砂,制备再生砖粉ECC,采用混凝土快速冻融试验,研究了氯盐、硫酸盐及复合盐(氯盐＋硫酸盐)溶液侵蚀作用下再生砖粉ECC的质量损失率和相对动弹性模量变化规律,建立了ECC在盐冻侵蚀环境下的损伤模型,并对其耐久性进行评价。结果表明:冻融循环300次后,再生砖粉ECC在清水、氯盐、硫酸盐及复合盐四种介质中的质量损失率分别为2.884%、4.984%、1.955%和6.891%,相对动弹性模量分别下降了6.468%、16.300%、24.303%和39.861%;再生砖粉ECC在单一盐冻情况下的抗冻等级大于F300,在复合盐冻情况下的抗冻等级大于F250,具有良好的抗盐冻性能;建立的冻融损伤模型可较好地反映ECC在不同冻融介质下的损伤度D_n与冻融循环次数的关系,可以为严寒地区的结构耐久性设计提供有效参考。

关键词: 再生砖粉, 工程水泥基复合材料, 盐类侵蚀, 冻融循环, 质量损失率, 相对动弹性模量, 冻融损伤模型

Abstract: Recycled brick powder engineered cementitious composites (ECC) was prepared by replacing quartz sand in ECC with recycled brick powder. The mass loss rate and relative dynamic elastic modulus of recycled brick powder ECC under the erosion of NaCl solution, Na₂SO₄ solution and NaCl+Na₂SO₄ solution were studied by rapid freeze-thaw test of concrete. The damage model of ECC under salt frost erosion environment was established, and its durability was evaluated. The results show that after 300 freeze-thaw cycles, the mass loss rates of recycled brick powder ECC in water, NaCl salt solution, Na₂SO₄ solution and NaCl+Na₂SO₄ salt solution are 2.884%, 4.984%, 1.955% and 6.891%, respectively. The relative dynamic elastic modulus decreases by 6.468%, 16.300%, 24.303% and 39.861%, respectively. The frost resistance grade of recycled brick powder ECC is greater than F300 in the case of single salt-freezing, and the frost resistance grade is greater than F250 in the case of composite salt-freezing, which has good salt-freezing resistance. The established freeze-thaw damage model can better reflect the relationship between the damage degree D_n of ECC under different freeze-thaw media and the number of freeze-thaw cycles, which can provide an effective reference for structural durability design in severe cold regions.

Key words: recycled brick powder, engineered cementitious composite, salt erosion, freeze-thaw cycle, mass loss rate, relative dynamic elastic modulus, freeze-thaw damage model

中图分类号:

TU528

楚留声, 张鹏, 赫约西, 元成方, 程站起. 盐冻耦合环境下再生砖粉ECC的耐久性研究[J]. 硅酸盐通报, 2024, 43(3): 1012-1020.

CHU Liusheng, ZHANG Peng, HE Yuexi, YUAN Chengfang, CHENG Zhanqi. Durability of Recycled Brick Powder ECC under Salt-Freezing Coupling Environment[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(3): 1012-1020.

参考文献

[1] LI V C, LEUNG C K Y. Steady-state and multiple cracking of short random fiber composites[J]. Journal of Engineering Mechanics, 1992, 118(11): 2246-2264.
[2] LI V C, WU H C, CHAN Y W. Effect of plasma treatment of polyethylene fibers on interface and ementitious composite properties[J]. Journal of the American Ceramic Society, 2005, 79(3): 700-704.
[3] 刘曙光, 闫敏, 闫长旺, 等. 聚乙烯醇纤维强化水泥基复合材料的抗盐冻性能[J]. 吉林大学学报(工学版), 2012, 42(1): 63-67.
LIU S G, YAN M, YAN C W, et al. Deicing salt resistance of PVA fiber reinforced cementitious composite[J]. Journal of Jilin University (Engineering and Technology Edition), 2012, 42(1): 63-67 (in Chinese).
[4] 张菊, 刘曙光, 闫长旺, 等. 氯盐环境对PVA纤维增强水泥基复合材料抗冻性的影响[J]. 硅酸盐学报, 2013, 41(6): 766-771.
ZHANG J, LIU S G, YAN C W, et al. Influence of chloride environment on frost resistance of PVA fiber reinforced engineered cementitious composite[J]. Journal of the Chinese Ceramic Society, 2013, 41(6): 766-771 (in Chinese).
[5] 靳贺松, 李福海, 何肖云峰, 等. 聚丙烯纤维水泥基复合材料的抗冻性能研究[J]. 材料导报, 2020, 34(8): 8071-8076+8082.
JIN H S, LI F H, HE X Y F, et al. Research on frost resistance of polypropylene fiber cement-based composite material[J]. Materials Reports, 2020, 34(8): 8071-8076+8082 (in Chinese).
[6] 乔思皓, 薛婉文, 吴绍奇, 等. 粉煤灰掺量对ECC力学性能及纤维破坏形态的影响[J]. 混凝土, 2022(8): 82-86+91.
QIAO S H, XUE W W, WU S Q, et al. Effect of fly ash content on mechanical properties and fiber failure morphology of ECC[J]. Concrete, 2022(8): 82-86+91 (in Chinese).
[7] 李恒, 郭庆军, 王家滨, 等. 再生混凝土界面结构及耐久性综述[J]. 材料导报, 2020, 34(13): 13050-13057.
LI H, GUO Q J, WANG J B, et al. Meso-/micro-structure of interfacial transition zone and durability of recycled aggregate concrete: a review[J]. Materials Reports, 2020, 34(13): 13050-13057 (in Chinese).
[8] 王家滨, 侯泽宇, 张凯峰, 等. 再生混凝土高浓度Mg²⁺-SO^2-₄-Cl^-复合盐侵蚀耐久性[J]. 材料导报, 2022, 36(23): 73-83.
WANG J B, HOU Z Y, ZHANG K F, et al. Durability of recycled aggregate concrete subjected to high concentration Mg²⁺-SO^2-₄-Cl^- compound salts[J]. Materials Reports, 2022, 36(23): 73-83 (in Chinese).
[9] ADESINA A, DAS S. Durability evaluation of green-engineered cementitious composite incorporating glass as aggregate[J]. Journal of Materials in Civil Engineering, 2020, 32(12): 04020354.
[10] ADESINA A, DAS S. Evaluation of the durability properties of engineered cementitious composites incorporating recycled concrete as aggregate[J]. Journal of Materials in Civil Engineering, 2021, 33(2): 04020439.
[11] ADESINA A, DAS S. Sustainable utilization of recycled asphalt as aggregates in engineered cementitious composites[J]. Construction and Building Materials, 2021, 283: 122727.
[12] CHENG Z Q, YAN W H, SUI Z B, et al. Effect of fiber content on the mechanical properties of engineered cementitious composites with recycled fine aggregate from clay brick[J]. Materials, 2021, 14(12): 3272.
[13] 元成方, 王娣, 李好飞, 等. 纤维掺量对再生砖粉ECC流动性能及力学性能的影响[J]. 建筑科学与工程学报, 2021, 38(5): 74-82.
YUAN C F, WANG D, LI H F, et al. Effect of fiber content on fluidity and mechanical properties of recycled brick powder ECC[J]. Journal of Architecture and Civil Engineering, 2021, 38(5): 74-82 (in Chinese).
[14] 赫约西. 盐冻环境下再生砖粉ECC的耐久性研究[D]. 郑州: 郑州大学, 2020.
HE Y X. Study on durability of ECC of recycled brick powder in salt freezing environment[D]. Zhengzhou: Zhengzhou University, 2020 (in Chinese).
[15] 中华人民共和国住房和城乡建设部. 普通混凝土配合比设计规程: JGJ 55—2011[S]. 北京: 中国建筑工业出版社, 2011.
Ministry of Housing and Urban-Rural Development, People's Republic of China. Specification for mix proportion design of ordinary concrete: JGJ 55—2011[S].Beijing: China Architecture and Construction Press, 2011 (in Chinese).
[16] 中华人民共和国住房和城乡建设部. 普通混凝土长期性能和耐久性能试验方法标准: GB/T 50082—2009[S]. 北京: 中国建筑工业出版社, 2009.
Ministry of Housing and Urban-Rural Development, People's Republic of China. Standard of test method for long-term performance and durability of ordinary concrete: GB/T 50082—2009[S]. Beijing: China Architecture and Construction Press, 2009 (in Chinese).
[17] 彭亮. 硫酸盐-氯盐耦合传输下对混凝土损伤过程的试验研究及其数值模拟[D]. 石家庄: 石家庄铁道大学, 2022.
PENG L. Experimental study and numerical simulation of concrete damage process under sulfate-chloride coupling transmission[D]. Shijiazhuang: Shijiazhuang Tiedao University, 2022 (in Chinese).
[18] 慕儒, 缪昌文, 刘加平, 等. 硫酸钠溶液对混凝土抗冻性的影响[J]. 建筑材料学报, 2001, 4(4): 311-316.
MU R, MIAO C W, LIU J P, et al. Effect of sodium sulphate solution on the frost resistance of concrete[J]. Journal of Building Materials, 2001, 4(4): 311-316 (in Chinese).
[19] 朱敏. 碳纳米纤维增强水泥基材料抗硫酸盐侵蚀及抗冻性能研究[D]. 杭州: 浙江工业大学, 2019.
ZHU M. Study on sulfate corrosion resistance and frost resistance of carbon nanofiber reinforced cement-based materials[D].Hangzhou: Zhejiang University of Technology, 2019 (in Chinese).
[20] 慕儒, 缪昌文, 刘加平, 等. 氯化钠、硫酸钠溶液对混凝土抗冻性的影响及其机理[J]. 硅酸盐学报, 2001, 29(6): 523-529.
MU R, MIAO C W, LIU J P, et al. Effect of nacl and Na₂SO₄ solution on the frost resistance of concrete and its mechanism[J]. Journal of the Chinese Ceramic Society, 2001, 29(6): 523-529 (in Chinese).
[21] 钱觉时, 余金城, 孙化强, 等. 钙矾石的形成与作用[J]. 硅酸盐学报, 2017, 45(11): 1569-1581.
QIAN J S, YU J C, SUN H Q, et al. Formation and function of ettringite in cement hydrates[J]. Journal of the Chinese Ceramic Society, 2017, 45(11): 1569-1581 (in Chinese).
[22] 中华人民共和国住房和城乡建设部. 混凝土结构耐久性设计标准: GB/T 50476—2019[S]. 北京: 中国建筑工业出版社, 2019.
Ministry of Housing and Urban-Rural Development, People's Republic of China. Standard for design of concrete structures durability: GB/T 50476—2019[S].Beijing: China Architecture and Construction Press, 2019 (in Chinese).
[23] 中华人民共和国住房和城乡建设部, 国家质量监督检验检疫总局. 水工建筑物抗冰冻设计规范: GB/T 50662—2011[S]. 北京: 中国计划出版社, 2012.
Ministry of Housing and Urban-Rural Development, the People's Republic of China, General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. Code for design of hydraulic structures against ice and freezing action: GB/T 50662—2011[S]. Beijing: China Plan Publishing House, 2012 (in Chinese).
[24] 乔宏霞, 孙斌, 陈丁山, 等. 冻融条件下混凝土性能衰减过程评价方法优化研究[J]. 中国建材科技, 2014, 23(2): 39-42+87.
QIAO H X, SUN B, CHEN D S, et al. The optimization research of methods of concrete perfoamance evaluation under the condition of freezing and thawing[J]. China Building Materials Science & Technology, 2014, 23(2): 39-42+87 (in Chinese).
[25] 乔宏霞, 路承功, 李宇, 等. 宁夏盐渍土地区现场暴露混凝土耐久性损伤评价试验[J]. 建筑科学与工程学报, 2016, 33(6): 44-52.
QIAO H X, LU C G, LI Y, et al. Experiment on durability damage assessment of concrete field exposed in saline soil area of Ningxia[J]. Journal of Architecture and Civil Engineering, 2016, 33(6): 44-52 (in Chinese).
[26] HASAN M, OKUYAMA H, SATO Y, et al. Stress-strain model of concrete damaged by freezing and thawing cycles[J]. Journal of Advanced Concrete Technology, 2004, 2(1): 89-99.