碱处理椰壳纤维对海水海砂混凝土力学性能影响研究  

Study on the effect of alkali-treated coir fibers on the mechanical properties of seawater sea sand concrete

作　　者：程艳雯 赵菲[1] 黄振辉 张青松 李良勇 习鑫强 CHENG Yanwen;ZHAO Fei;HUANG Zhenhui;ZHANG Qingsong;LI Liangyong;XI Xinqiang(School of Civil Engineering and Architecture,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学土木建筑工程学院,海口570228

出　　处：《复合材料科学与工程》2025年第2期20-27,90,共9页Composites Science and Engineering

基　　金：海南省自然科学基金高层次人才项目(520RC549);国家自然科学基金青年项目(42207190)。

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。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.

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 

分 类 号：TB332[一般工业技术—材料科学与工程]