持压荷载下剑麻纤维-ECC的毛细吸水性能

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (12): 4234-4244.

所属专题：水泥混凝土

持压荷载下剑麻纤维-ECC的毛细吸水性能

崔双双^1,2, 陈润², 陈艳², 陈伟宏^3,4, 陈树辉⁵

1.地下工程福建省高校重点实验室,福州 350118;
2.福建工程学院土木工程学院,福州 350118;
3.福州大学土木工程学院,福州 350116;
4.中交鹭建有限公司,福州 350108;
5.健研检测集团有限公司,厦门 361004

收稿日期:2022-07-20 修订日期:2022-09-23 出版日期:2022-12-15 发布日期:2023-01-11
通信作者: 陈伟宏,博士,副教授。E-mail:chenweihong1980@163.com
作者简介:崔双双(1983—),女,博士,副教授。主要从事钢筋混凝土结构抗震、抗倒塌的研究。E-mail:cshuangshuang@163.com
基金资助:
福建省科技厅自然科学基金面上项目(2021J011065,2022J01557);福建省建设厅科技研究开发项目(2022-K-68);厦门市建设局建设科技计划项目(XJK-2021-1-20);福建省交通厅重点项目(201914)

Capillary Water Absorption Performance of Sisal Fiber-ECC under Sustained Compressive Loading

CUI Shuangshuang^1,2, CHEN Run², CHEN Yan², CHEN Weihong^3,4, CHEN Shuhui⁵

1. Key Laboratory of Underground Engineering in Fujian Province, Fuzhou 350118, China;
2. College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
3. School of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
4. China Transportation Lujian Co., Ltd., Fuzhou 350108, China;
5. Jianyan Testing Group Co., Ltd., Xiamen 361004, China

Received:2022-07-20 Revised:2022-09-23 Online:2022-12-15 Published:2023-01-11

摘要/Abstract

摘要： 为解决地下结构侧墙等混凝土构件开裂渗漏问题,选取了绿色经济型剑麻纤维-工程水泥基复合材料(ECC)取代混凝土提高构件的抗渗性能。根据正交试验进行方案设计得到剑麻纤维-ECC的最优配合比;改进了实时吸水试验装置,实现了持压荷载与水分传输的同步耦合过程;对剑麻纤维-ECC开展了持压荷载下的毛细吸水性能试验,分析了压应力水平(10%~40%)对剑麻纤维-ECC试件的破坏形态、累计吸水量及毛细吸水率的影响规律,并与普通混凝土试件进行对比。结果表明:在10%~40%压应力水平下,随着压应力水平的提高,剑麻纤维-ECC的毛细累计吸水量和平均吸水率均先减小后增大,发生变化的压应力水平阈值为20%;在10%~30%压应力水平下,剑麻纤维-ECC的毛细累计吸水量及吸水率要明显小于同条件时的普通混凝土,剑麻纤维-ECC能够更好地阻碍水分传输,表明对压应力水平为10%~30%的结构而言,剑麻纤维-ECC可明显改善抗渗效果。研究成果可为剑麻纤维-ECC在地下结构侧墙抗渗中的应用提供理论支持。

关键词: 剑麻纤维, ECC, 抗渗性能, 短期持压, 毛细吸水性能, 地下结构侧墙, 混凝土构件

Abstract: In order to solve the crack and leakage problem of concrete members such as side walls of underground structures, the green economy sisal fiber-engineered cementitious composite (ECC) was selected to replace concrete to improve the impermeability of members. The optimal ratio of sisal fiber-ECC was obtained by orthogonal experiment. An improved experimental setup was self-designed for realizing synchronous coupling of sustained compressive loading and water transfer by sisal fiber-ECC. The capillary water absorption performance test under sustained compressive loading was carried out on sisal fiber-ECC. The effects of stress levels (10%~40%) on the destruction morphology, cumulative amount of water absorption and capillary water absorption rate of sisal fiber-ECC specimens were analyzed, and compared with that of ordinary concrete specimens. The results indicate that within 10%~40% compressive stress level, the cumulative amount of water absorption and the average water absorption rate of the sisal fiber-ECC both decrease first and then increase with the increase of compressive stress level. The stress threshold for variation of capillary water absorption performance of specimens is 20% of its ultimate compressive strength. When the sustained compressive loading is in the range of 10% to 30% compressive stress level, compared with ordinary concrete, the sisal fiber-ECC can maintain a lower cumulative amount of water absorption and water absorption rate. Sisal fiber-ECC has better impeding effect on water tranfer. It shows that the impermeability of the structure at low compressive stress level (10%~30%) can be significantly improved by sisal fiber-ECC. The research results can provide theoretical support for the application of sisal fiber-ECC in the impermeability of side walls of underground structure.

Key words: sisal fiber, ECC, impermeability, short-term sustained compression, capillary water absorption performance, side wall of underground structure, concrete member

中图分类号:

TU528

崔双双, 陈润, 陈艳, 陈伟宏, 陈树辉. 持压荷载下剑麻纤维-ECC的毛细吸水性能[J]. 硅酸盐通报, 2022, 41(12): 4234-4244.

CUI Shuangshuang, CHEN Run, CHEN Yan, CHEN Weihong, CHEN Shuhui. Capillary Water Absorption Performance of Sisal Fiber-ECC under Sustained Compressive Loading[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(12): 4234-4244.

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持压荷载下剑麻纤维-ECC的毛细吸水性能

Capillary Water Absorption Performance of Sisal Fiber-ECC under Sustained Compressive Loading

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