Enhancement of the piezoresistive and mechanical properties of cement-based composites filled with CNTs/GO and nano-SiO2 sprayed steel fibers

被引：3

作者：

Sun, Jiongfeng ^{[1
]}

Qiao, Guofu ^{[1
,2
,3
]}

机构：

[1] Harbin Inst Technol, Sch Civil Engn, 73 Huanghe Rd, Harbin 150090, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Minist Ind & Informat Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disaste, Harbin 150090, Peoples R China

[3] Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2023年 / 385卷

关键词：

Nanomaterials modification; Spraying method; Self-sensing properties; Pull-out test; Macro mechanical performance; HIGH-PERFORMANCE CONCRETE; CARBON NANOTUBE; SMART CONCRETE; SENSORS;

D O I：

10.1016/j.conbuildmat.2023.131463

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Steel fibers (SFs) are one of the most suitable functional fillers for the preparation of large-volume self-sensing concrete due to their good dispersion and toughness, whereas it has poor sensing performance. In this paper, a CNTs/GO-sprayed method was proposed to modify the surface of SFs as well as nano-SiO2 was used to enhance the interface between SFs and matrix, in which the content of carbon-based materials could be precisely quantified. Then, self-sensing performance, pull-out test, and macro stable mechanical performance were carried out. The results revealed that the specimens filled with straight smooth (SS) SFs sprayed with GO and nano-SiO2 had the highest self-sensing ability. Compared to unmodified SFs, the degree of improvement reached 225% and 270% within 0 - 60 kN and 0 - 90 kN, respectively, and the addition of nano-SiO2 increased the pull-out energy. In addition, the macro mechanical properties of the specimens filled with the modified SS SFs were better than that of the hooked end (HE) SFs.

引用

页数：13