Degradation of mechanical properties and microstructure evolution of basalt-carbon based hybrid FRP bars in real seawater and sea-sand concrete

被引：17

作者：

Guo, Xiangke ^{[1
,2
,3
]}

Jin, Zuquan ^{[1
,2
]}

Xiong, Chuansheng ^{[1
,2
]}

Pang, Bo ^{[1
,2
]}

Hou, Dongshuai ^{[1
,2
]}

Li, Weihua ^{[3
,4
]}

机构：

[1] Qingdao Univ Technol, Coll Civil Engn, Qingdao 266250, Peoples R China

[2] Minist Educ, Engn Res Ctr Concrete Technol Marine Environm, Qingdao 266520, Peoples R China

[3] North China Univ Water Resources & Elect Power, Coll Civil Engn & Commun, Zhengzhou 450046, Peoples R China

[4] Henan Acad Sci, Zhengzhou 450002, Peoples R China

来源：

COMPOSITES PART B-ENGINEERING | 2024年 / 271卷

基金：

中国国家自然科学基金;

关键词：

Hybrid FRP bars; Seawater and sea-sand concrete; Interlaminar shear strength; Tensile strength; Durability; LONG-TERM DURABILITY;

D O I：

10.1016/j.compositesb.2023.111163

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The degradation of basalt fibre-reinforced polymer (BFRP) bars induced by alkaline environments hinders their application in seawater and sea-sand concrete (SWSC). The use of carbon fibres (CFs) to partially replace basalt fibres in the preparation of hybrid-FRP (HFRP) bars is an effective method for enhancing the durability of BFRP-bar. To evaluate the effectiveness of using CFs to replace part of the basalt fibres in preparing HFRP bars to enhance the durability of BFRP-bar in real SWSC. The tensile and interlayer interface properties of HFRP bars with different CFs hybrid contents (VCF, %) and arrangements in the SWSC were tested after exposure to seawater at different temperatures. Digital microscopy, scanning electron microscopy, X-ray computed tomography and matrix digestion analysis were used to investigate the microstructural evolution of HFRP bars and SWSC after conditioning. The results showed that the VCF increasing to 10% or 25% significantly alleviated the interlaminar shear strength (ILSS) and tensile strength (TS) losses. The maximum enhancements in the ILSS and TS retention for the SWSC-embedded BFRP bar were 19.12% and 17.55%, respectively. The hybrid CFs changed the failure model of the BFRP-bar. Compared with HFRP bars with CFs in the core, HFRP bars are more likely to deteriorate when the CFs are dispersed circumferentially. The hybrid CFs improved the environmental reduction coefficients (ERC) of TS and ILSS of the HFRP bars. Compared with the SWSC, the ERC of the HFRP bars in the normal concrete was significantly improved.

引用

页数：23