碱处理椰壳纤维对海水海砂混凝土力学性能影响研究

doi:10.19936/j.cnki.2096-8000.20250228.003

摘要/Abstract

摘要： 为解决海洋和岛礁工程建设中淡水河砂从陆上远距离运输的高成本问题,同时资源化利用椰壳纤维增强增韧性能,提出一种高性能、低成本、低能耗的建筑材料——碱处理椰壳纤维增强海水海砂混凝土。通过设计三种宏观破坏性试验(抗压、劈裂抗拉和抗折强度试验),结合宏观试验破坏现象以及微观结构电镜分析,研究并验证碱处理椰壳纤维长度和掺量对海水海砂混凝土力学性能的影响规律。将碱处理前后的椰壳纤维置于不同溶液中进行吸湿率测试,并利用电镜观测碱处理前后纤维的微观结构,证明碱处理不仅可提高椰壳纤维的粗糙度,削弱纤维的亲水性,还有效增强了纤维与混凝土之间的黏结效果。

关键词: 椰壳纤维, 海水海砂混凝土, 碱处理, 力学性能, 复合材料

Abstract: To address the problem of the high cost of freshwater river sand transported over long distances from land in the construction of marine and island projects, and to make resourceful use of the reinforcing and toughening properties of coir fibers, the alkali-treated coir fiber-reinforced seawater sea sand concrete was proposed as a high performance, cost-effective and low-carbon building material. By designing three kinds of macroscopic destructive tests (compressive, splitting tensile and flexural tensile strength tests), and combination of macroscopic experimental damage phenomena and microstructural electron microscopic analyses, the effects of alkali-treated coir fiber’s length and content on the mechanical properties of seawater sea sand concrete were studied and verified. The absorptivity of natural and alkali treated coir fibers was tested in different solutions, and the microstructure of the fibers was observed by electron microscopy. It is proved that alkali treatment could not only improve the roughness of coir fibers,weaken the moisture absorption rate of the fibers, but also effectively enhance the bonding effect between the fibers and the concrete.

Key words: coir fiber, seawater sea sand concrete, alkali treatment, mechanical properties, composites

中图分类号:

TB332

程艳雯, 赵菲, 黄振辉, 张青松, 李良勇, 习鑫强. 碱处理椰壳纤维对海水海砂混凝土力学性能影响研究[J]. 复合材料科学与工程, 2025, 0(2): 20-27.

CHENG Yanwen, ZHAO Fei, HUANG Zhenhui, ZHANG Qingsong, LI Liangyong, XI Xinqiang. Study on the effect of alkali-treated coir fibers on the mechanical properties of seawater sea sand concrete[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(2): 20-27.

参考文献

[1] 冯鹏, 王杰, 张枭, 等. FRP与海砂混凝土组合应用的发展与创新[J]. 玻璃钢/复合材料, 2014(12): 13-18.
[2] 朱德举, 周琳林, 耿健智, 等. 不同地域海砂取代率对混凝土力学性能的影响[J]. 湖南大学学报(自然科学版), 2022, 49(11): 237-244.
[3] LI T Y, LIU Y X, ZHANG Y M, et al. Preparation of sea water sea sand high performance concrete (SHPC) and serving performance study in marine environment[J]. Construction and Building Materials, 2020, 254: 119114.
[4] VAFAEI D, HASSANLI R, MA X, et al. Fracture toughness and impact resistance of fiber-reinforced seawater sea-sand concrete[J]. Journal of Materials in Civil Engineering, 2022, 34(5): 04022038.
[5] 黄亮, 谢建和, 陆中宇. 海水海砂混凝土研究现状与应用前景[J]. 混凝土, 2020(9): 155-160.
[6] GUO X K, XIONG C S, JIN Z Q, et al. A review on mechanical properties of FRP bars subjected to seawater sea sand concrete environmental effects[J]. Journal of Building Engineering, 2022, 58: 105038.
[7] GUAN H B, HAO B X, ZHANG G H. Mechanical properties of concrete prepared using seawater, sea sand and spontaneous combustion coal gangue[J]. Structures, 2023, 48: 172-181.
[8] GE L C, FENG Z X, SAYED U, et al. Research on the performance of seawater sea-sand concrete: a review[J]. Construction and Building Materials, 2023, 409: 133921.
[9] ZHU M Z, CHEN B, WU M, et al. Preparation and mechanical characterization of cost-effective low-carbon engineered cementitious composites with seawater and sea-sand[J]. Cement and Concrete Composites, 2023, 136: 104883.
[10] MAHMUD M A, ABIR N, ANANNYA F R, et al. Coir fiber as thermal insulator and its performance as reinforcing material in biocomposite production[J]. Heliyon, 2023, 9(5): e15597.
[11] POONGODI K, MURTHI P, REVATHI P. Influence of coir fibre and recycled aggregate on bond strength of pavement quality concrete[J]. Materials Today: Proceedings, 2022, 61: 400-405.
[12] SAM N, SHEEJA M K. Durability study on coir fibre reinforced concrete[J]. International Journal of Engineering and Technical Research, 2016, 5(8): 481-485.
[13] KOCHOVA K, GAUVIN F, SCHOLLBACH K, et al. Using alternative waste coir fibres as a reinforcement in cement-fibre composites[J]. Construction and Building Materials, 2020, 231: 117121.
[14] ADENIYI A G, ONIFADE D V, IGHALO J O, et al. A review of coir fiber reinforced polymer composites[J]. Composites Part B: Engineering, 2019, 176: 107305.
[15] ZHANG X X, PEL L, GAUVIN F, et al. Reinforcing mechanisms of coir fibers in light-weight aggregate concrete[J]. Materials, 2021, 14(3): 699.
[16] WANG B, YAN L B, KASAL B. A review of coir fibre and coir fibre reinforced cement-based composite materials (2000-2021)[J]. Journal of Cleaner Production, 2022, 338: 130676.
[17] SANTAFÉ H P, PERISSÉ D L F, COSTA L, et al. Mechanical properties of tensile tested coir fiber reinforced polyester composites[J]. Revista Matéria, 2010, 15(2): 113-118.
[18] 刘继鹏, 张哲. 黄麻纤维加筋黄土动力特性研究[J]. 硅酸盐通报, 2022, 41(5): 1663-1668, 1688.
[19] BALDA S, SHARMA A, CAPALASH N, et al. Banana fibre: a natural and sustainable bioresource for eco-friendly applications[J]. Clean Technologies and Environmental Policy, 2021, 23(5): 1389-1401.
[20] JAWAID M, CHEE S S, ASIM M, et al. Sustainable kenaf/bamboo fibers/clay hybrid nanocomposites: properties, environmental aspects and applications[J]. Journal of Cleaner Production, 2022, 330: 129938.
[21] 郑祥增. 剑麻纤维-ECC的抗渗性能影响因素研究[J]. 混凝土与水泥制品, 2023(11): 57-61.
[22] YUSOFF R B, TAKAGI H, NAKAGAITO A N. Tensile and flexural properties of polylactic acid-based hybrid green composites reinforced by kenaf, bamboo and coir fibers[J]. Industrial Crops and Products, 2016, 94: 562-573.
[23] 梁贺, 刘辰一, 李心涵, 等. 植物纤维增强混凝土研究进展[J]. 常州工学院学报, 2023, 36(4): 1-5.
[24] WU H S, SHEN A Q, CHENG Q Q, et al. A review of recent developments in application of plant fibers as reinforcements in concrete[J]. Journal of Cleaner Production, 2023, 419: 138265.
[25] WEI J Q, MEYER C. Degradation mechanisms of natural fiber in the matrix of cement composites[J]. Cement and Concrete Research, 2015, 73: 1-16.
[26] ARDANUY M, CLARAMUNT J, FILHO R D T. Cellulosic fiber reinforced cement-based composites: a review of recent research[J]. Construction and Building Materials, 2015, 79: 115-128.
[27] VALÁEK P, MÜLLER M, ŠLEGER V, et al. Influence of alkali treatment on the microstructure and mechanical properties of coir and abaca fibers[J]. Materials, 2021, 14(10): 2636.
[28] WIDNYANA A, RIAN I G, SURATA I W, et al. Tensile properties of coconut coir single fiber with alkali treatment and reinforcement effect on unsaturated polyester polymer[J]. Materials Today: Proceedings, 2020, 22: 300-305.
[29] KLERK M D, KAYONDO M, MOELICH G M, et al. Durability of chemically modified sisal fibre in cement-based composites[J].Construction and Building Materials, 2020, 24: 117835.
[30] YAN L B, CHOUW N, HUANG L, et al. Effect of alkali treatment on microstructure and mechanical properties of coir fibres, coir fibre reinforced-polymer composites and reinforced-cementitious composites[J]. Construction and Building Materials, 2016, 112: 168-182.
[31] 修林鹏, 常宇飞, 周智, 等. 真实海水环境下海水海砂混凝土内FRP筋性能退化研究[J]. 海南大学学报(自然科学版), 2022, 40(3): 300-308.
[32] HASAN K M F, HORVÁTH P G, BAK M, et al. A state-of-the-art review on coir fiber-reinforced biocomposites[J]. RSC Advances, 2021, 11: 10548-10571.
[33] 中华人民共和国住房和城乡建设部. 纤维混凝土应用技术规程: JGJ/T 221—2010[S]. 北京: 中国建筑工业出版社, 2011.
[34] 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.
[35] 中华人民共和国住房和城乡建设部. 混凝土物理力学性能试验方法标准: GB/T 50081—2019[S]. 北京: 中国建筑工业出版社, 2019.
[36] GWON S, CHOI Y C, SHIN M. Effect of plant cellulose microfibers on hydration of cement composites[J]. Construction and Building Materials, 2021, 267(18): 121734.